Schemes of LJ TV Chassis MS 049 p. Strickered and frame scanners

On the basis of the MS-994A chassis, the following models of TVs are available: SA-14 / 20/21 F89W, CA-14 / 20/21 F89X, CF-2O / 21 D79, CF-2O / 21 F39, CF-14/20/21 F69X, CF-14 / 20/21 F89, CF-14 / 20/21 F89W, CF-14 / 20/21 F89X. The main technical characteristics of these models are presented in Table. one.

Design and features of the chassis MS-994A

Constructively, the chassis consists of the main board, the kineskop card, the "Eye" board (see Table 1) and the teletext module. The last two nodes are installed optionally. The main feature of the new chassis is the use of a TOSHIBA TSHIBA TSHIBA TSHIBA TSHIBA Multifunction Microcircuit, a video processor, a video processor, a video processor, a synchroprocessor and an interface scheme I 2 C. Its use significantly simplified chassis chassis, which, in turn, led to an increase Reliability of televisions.

Table 1. Basic technical characteristics of LG TVs based on MS-994A chassis

Characteristic	Description
Diagonal Screen, Inch	14, 20, 21
Color television systems	PAL, SECAM, NTSC 4.43 (NTSC 3.58 - with LF-input)
Television standards	D / k, b / g, i, m
Range of received frequencies, MHz	VHF-L: 46,25 ... 168.25 VHF-H: 172.25 ... 463.25 UHF: 471.25 ... 863,25
Number of memorable programs	100
Additional functions	EYE (automatic setting of image parameters depending on the illumination); Timer on / off; Timer "Sleep"; Blocking from children; Switching image format (Standart, Wide, Zoom); Camera mode (not on all models)
Food	AC network 100 ... 270V, 50 Hz
Power consumption, W	until 95.
Sound	Monophonic
Output power of the audio channel, W	5
Impedance antenna entrance, ohm	75, asymmetrical

The chassis management system is built on a microcontroller (MK) of the MITSUBISHI MS37221 type IC01, working paired with a non-volatile memory of IC02 type 24c04. To exchange data between chips and transmit commands, the IC501 MK microcircuits uses the digital interface I 2 C.

A feature of the new chassis is the presence of an interface for a camcorder that allows you to use the TV, in particular, as a monitor of the video surveillance system.

In tab. 2 shows the parameters of interchangeable elements depending on the diagonal of the screen of the kinescope.

Table 2. Parameters of replaceable elements depending on the diagonal of the screen of the kinescope

Positioning	Nominal and types of elements
	Kineskop 14 "	Kineskop 20 "	Kineskop 21 "
FR401, Oh.	2,4	5,4	1,4
IC804.	SE110N.	SE110N.	SE115
TN801	163-054F.	163-012S.	163-O12S.
R303, Oh.	5,6	4,7	3,9
R304, Oh.	5,6	4,7	3,9
R309, Oh.	5,1	5,1	1,2
R311, OM.	1,5	1.5	4,7
R405, Oh.	82	47	47
R407, com	12	12	10
R410, com	130	100	100
R905, OM.	390	330	330
R913, Oh.	33	39	27
R915, Oh.	390	330	330
R922, Oh.	390	330	330
R924, Oh.	470	270	270
C402, PF	180	180	390
C412, ICF.	0,39	0,33	0,36
C414, PF	7300	7300	7300
C902, PF	330	560	560
C904, PF	470	330	330
C907, PF	270	560	560

Consider the work of the main chassis nodes and the paths of sound and video signals, as well as the main elements of their processing.

Power Supply

The power supply (BP) generates stabilized voltages +115 (B +), +20 (S-VCC), +14, +12, +9 and +5 V (ST-5V) to power the chassis nodes in working and duty modes. It is built according to the scheme of a quasi-resonance circuit converter on the IC803 chip of the SANKEN str-F6707 type. The IC803 includes: a specifying generator, launching scheme, overload, overvoltage and overheating, as well as a power cascade on a powerful bipolar transistor. The microcircuit is turned on at an output voltage. 4 about 8.5 V, and it turns off at a voltage of 5 V and consumes current in operating mode, equal to 30 mA, and in the duty room - 200 μA. The R809 R810 circuit forms a starting voltage, and Obm. 1-2 T802 and rectifier on the elements D806, C801 - the supply voltage in the operating mode. The output voltages are stabilized by the IC804 IC801 feedback chain, the input of which (out. 11c804) is connected to the B + bus, and the output to the input of the IC803 controller error amplifier input (out. 1). To control the limit current through the power key of the serve (R805), the voltage drop is removed and the output is fed. 11C803 (protection level of about -0.9 ...- 1.2 V). Using transistor keys Q805-Q807 and Optocrem IC802 MK signal with an output. 5 Switches BP to standby mode. In this case, the converter operates at the minimum operating frequency.

The diagram on the elements R807, C831, Q831, Q832 generates an ABNORMAL alarm to MK (out. 6) in case of faults in the output circuits of the tire B + or in the line scanning circuit. Secondary voltages +5 and +9 in are formed by integral stabilizers IC805 and IC844, and the last is controlled. The IC844 microcircuit is controlled by an ON / OFF MK signal (out. 5).

Tract image

A television radio signal from an antenna login enters the TU101 tuner input, which manages the MK (out. 31, 33 IC01) via the I2C interface (out. 4, 5 TU101). The tuner is powered by a voltage of 5 V (out. 7). The output signal of the tuner (output 11) with an innecess of 38 MHz, through the Z101 strip filter, which forms the frequency response of the IF path, is supplied to the EU input. 6 and 7 IC501 microcircuits. We present its main functions:

• forming a full color video signal (CVBS) from the PCH signal;
• generating a sound signal from the PCS signal;
• formation of ARU voltage for tuner;
• automatic determination of the chroma system and decoding of PAL and NTSC systems;
• management of the external SECAM decoder (IC502);
• selection of the brightness signal from CVBS;
• forming from colorless signals: brightness and basic colors (RGB);
• switching RGB signals and on-screen menus (OSD), gain them to the level necessary to control output video sellers on the transistors Q901-Q903;
• selection of synchropulse from CVBS and the formation of strings of the string sweep and sawtooth voltage to control the frame scan;
• receiving and processing control commands from MK via Interface I 2 C.

The assignment of the TB1238An chip conclusions is presented in Table. 3.

Table 3. Purpose of TB1238AN chip conclusions

Output number	Signal	Description
1	DE-Emp	sound signal output to attenuator
2	Audio-Out.	Sound output output
3	IFVCC.	The supply voltage of the analog part 9 in
4	AFT Out.	APC output
5	ID GND.	Common
6	If in.	Input signal PC.
7	If in.	Input signal PC.
8	RF AGC.	ARU voltage for tuner
9	If Agc.	Voltage ARU for UPUs
10	APC Filter.	Filter automatic image adjustment
11	X-Tal	Quartz resonator 4.43 MHz
12	Y / C GND	Common brightness and chroma channels
13	YS / YM.	Half Tone Mode Control
14	OSD R.	OSD R signal input
15	OSD G.	OSD G signal input
16	OSD B.	OSD signal input in
17	RGB VCC.	The supply voltage of the video processor 9 in
18	R Out.	Signal output R.
19	G Out.	Signal output G.
20	B Out.	Signal output B.
21	Abcl	Log in brightness adjustment schemes and current limits
22	V ramp	Condenser GPN frame scan
23	V NFB.	Introduction input OH Foreign Scan
24	V out.	Output of sawdust voltage frame sweep
25	V AGC.	Filter ARU frame scan
26	SCL.	I 2 interface synchronization bus with
27	SDA	I 2 interface data bus with
28	H. VCC.	Power supply voltage of the deficent generator 9 in
29	ID / SW OUT	SECAM SIGNAL SIGHT
30	FBP In.	Entrance Sioch
31	Sync Out.	Synchronization signal output
32	H. Out.	Launching the start of the string sweep
33	DEF. GND.	Common
34	SCP Out.	The output of the two-tier SCP gating pulses
35	Video SW.	CVBS video output for SECAM decoder
36	Dig VDD.	Nutrition of the digital part of the scheme (5 V)
37	SECAM B-Y	sECAM B-Y Signal Input
38	SECAM R-Y	SECAM R-Y Signal Input
39	Y-IN.	Brightness signal input Y
40	H. AFC.	Filter APCH 1.
41	Ext Yin.	Input 1 video switcher
42	Dig. GND.	General digital part of the scheme
43	TV in	Input 2 video switches
44	Black-Det.	Filter Signal Extension Schemes in the Black
45	With IN.	Input of the external color signal
46	Y / C VCC	The supply voltage of the video processor 5 V
47	Det Out.	Video output output
48	Loop Filter.	Connecting the filter ARU
49	GND.	General Gong
50	Vco.	Supporting Contour GUN
51	Vco.	Supporting Contour GUN
52	VCC.	Power supply 9 in Gun
53	Lim In.	Signal input PCs
54	Ripple Filter.	Smoothing filter
55	Ext Audio In.	Out of external audio signal
56	FM DC NF.	Sound tract power filter

On the input of the video processor switch (out. 14-16 IC501), the OSD-R, G, G, B, TXT-R / G / B teletext or external SCART-R / G / B signals can be fed. The selection of the required signals is performed by the IC751 switch controlled by the FB-ID signals (out. 39 IC01), TXT-FB (Cont. 8 P701B) or SCART-FB (Cont. 16 PJ201). Output video signals of basic colors with an output. 18.19, 20 IC501 across Cont. 2, 4 and B connector R901B are enrolled on the transistors of the output videos Q901-Q903, which are powered by a voltage of 180 V from the line scanning circuit. In addition, through the contact. 1 P901B The voltage of the 12 V displacement voltage is supplied to the videos, which defines the operating points of the transistors. The adjusting elements of video amplifiers in the diagram are absent because all adjustments performs the iC501 video processor in the service mode using MK over the I 2 C interface.

Sound tract

The main part of the sound tract is in the IC501 chip. To highlight the sound signals of various standards, the IC151 switch with F151-F154 filters, controlled by signals MK: SO, S1 and M4.5 (output 38, 39, 14). The RAM signal from the output of the videoetector (out. 47 IC501) via the Q507 buffer is fed to the F151-F154 filter inputs connected to the IC151 switch. PC output signal output. 3 IC151 enters the demodulator - an output. 53 IC501. The output audio signal from the demodulator is enhanced and fed to the int / ext switch (inside IC501) to select the appropriate signal. External sound output signal. 55 IC501 comes with SCART or Tulip connectors. The IC01 microcontroller on the I 2 interface c The sound signal source is removed from the output. 2 IC501 and is fed to the input of the sound frequency power amplifier (UMP) - an output. 5 IC601 chips of the TDA7253 type, which is a single-sided two-stroke AV grade amplifier with short circuit protection and the input of the MUTE sound lock (out. 3). From its output (out. 8) the signal through the separation capacitor C605 and the R601 connector enters the dynamic head. Ump feeds from the power supply voltage 20 V (S-VCC).

Teletext module

On the MS-994A chassis, a teletext module can be installed, which is connected through the R701B connectors, P702B. The base of the module is the IC701 microcircuit of the SAA5281 type, which has 8 kx8 RAM to 8 pages of teletext. It is designed to work with the 625-line Standard WST (World System Teletext). In addition, the microcircuit decodes the VPT signals (programming a video recorder). It is controlled by the MK on the I2C interface (out. 24, 25). For work IC701 on its output. 9 With IC501 (out. 35) Enters TXT-CVBS video. At the outputs of the chip, the signals of the teletext R, G, B (out. 16, 17,18) and the exit signal (gate) TXT-FB (output 20) are generated, which are fed to the IC751 switch, and from it to the IC501 video processor.

To power the teletext module to contact. 3 P701B The voltage 9V from the power supply is supplied. The IC701 microcircuit is powered by a voltage of 5 V from the IC702 stabilizer.

Strickered and frame scanners

The lowercase scan is constructed along a conventional two-stage diagram (transistors Q401, Q402) with serial power output cascade. The transistor Q401 is powered by a voltage of 14 V, A Q402 - voltage of +115 V (B +) from the power supply. The output transistor has an internal damper diode. The lowercase transformer T402 generates the supply voltage of the kinescope, frame sweep (24 V) and output videos (180 V). All secondary chains T402 are protected from overload discontinuous resistors FR301, FR401 and FR501.

On the C418 condenser, the voltage is formed, inversely proportional to the flow of the kinescope rays. The ABL signal (otl) from the output of the formator enters the output. 21IC501 To control brightness adjustment and current limits.

The output cascade of frame sweep is implemented on the IC301 type LA7833 microcircuit of the company Sanyo. Pilotchidic pulses of frame scan come to the input of the chip (out. 4) with an output. 24 IC501. To the output of the chip (out. 2) Personnel coils of the V-DY OS are connected. To control and stabilize the size by vertical from the output of the amplifier, the V-NFB feedback signal is removed and the output is fed. 23 IC501.

As already noted, the IC301 microcircuit is powered by a 24 V voltage (out. 6) from the line scanning circuit.

To synchronize the OSD circuit, the pulses of the lowercase (output. 10 T402) and the frame (out. 7 IC301) scan through the inverters Q01, Q02 are fed to MK (out. 1 and 2).

Microcontroller

IC01 Mark performs the control function by all chassis nodes. The operation of the MK provides a quartz resonator x01 (out. 19, 20), the IC03 reset circuit and non-volatile memory IC02. The purpose of the microcircuit conclusions is presented in Table. four.

Table 4. Appointment of IC01 chip conclusions

Output number	Signal	Purpose
1	H-sync.	Entry of lowercase sync pulses
2	V-sync.	Entry of personnel syncimpuls
3	Led.	Output to the LED indicator
4	CC / AV-ID	Entrance to the identification of sources "Camera / NF-Login"
5	Power	Power supply control output
6	ABS	Alarm input
7	MNT-CTL.	Sound Switching on SCART (TV / AV)
8	DEGAUSE.	Fiberglass incorporation switching on
9	Eye.	Remote Illumination Signal Input
10	IR-in	Signal input from the photodetector
11	SD-IN.	Entering the Identification Video Signal
12	Turbo.	Tuning setup mode switch
13	TBS-SW.	Output switch of time speaker ARU tuner
14	4.5m	Standard M.
15	S-Mute.	Sound lock output (not used)
16,18,21	GND.	Common
17	FS.	Switching in service mode
19	X-in	Quartz resonator 8 MHz
20	X-Out.	Quartz resonator 8 MHz
22	VCC.	Supply voltage +5 in
23	0sc2.	Generator Output 1 (not used)
24	0SC1	Generator input 1 (not used)
25	Reset.	Resetting
26	Aft.	Input Control of Accurate Tuner Settings
27	AGC	Input voltage Aru
28	F8-ID	SCART CHANCE PULS IN ENTRANCE
29	Key1.	Login 1 keyboard scanning
30	Key2.	Login 2 keyboard scanning
31	SDA1	I2C interface data bus
32	CCTV-CTL.	TV / Camera mode switch output
33	SCL1	RS interface sync bus
34	CCTV-ID	CCTV signal identification input
35	Ym.	Switch output "1/2 image brightness"
36	Melody	Sound information output
37	51	Output 1 switch television standard
38	SO.	Output 2 switch television standard
39	FB.	OSD impulse exit
40-42	B-G-R	OSD video signal outputs

Service mode

As in any modern television receiver needed after the repair or replacement of the elements of the RF tract, the video processor and other nodes on the MS-994A chassis are performed in the service mode. To work in this mode, you must have a remote control with the teletext control buttons. Before performing adjustments, turn on the TV, it is fed to its antenna input "Test Table" and heated for 15 ... 20 minutes.

To enter the service mode, the "OK" buttons on the remote control and on the front panel of the TV, holding them, while the list of adjustable parameters appears on the screen (Fig. 1). The last string "Line SVC 0" shows the menu number, and there are five of them (Line SVC 0-4).

Fig. 1. List of adjustable parameters in service mode

The required parameter is selected by the joystick up-down joysticks, and adjust its value to the "right-left" buttons. To save the new value of the parameter, the "OK" button is pressed. To exit the service mode, we translate the TV to the duty mode using the POWER PO button. Consider the sequence of adjustments of the main parameters on the MS-994A chassis.

Adjusting RF ARU

This adjustment is required after replacing the tuner, as well as when significant noise (interference) appears in the image.

• Connect the voltmeter to the output. 1 tuner TU101.
• Served on the antenna input of the TV with a television signal generator signal "Colored polo
• sY "With a level of 65 dB, include and configure the TV to receive this signal, and then switch it to the service mode.
• Select the "AGC" parameter menu and the adjustment is achieved by a voltmeter readings equal to 2.3 V for a tuner of type 6700VPv002a or 3.0 V - for a tuner of type 6700VPV002B. The "OK" button remembers the new value of the "AGC" parameter.

Adjusting accelerating strokes

Accelerating voltage is usually adjustable after replacing the kinescope or after repairing the line scanning circuit.

• Serve the color bands from the television signal generator to the antenna input of the TV.
• In service mode, select the "Line SVC 3" menu, and in it - the "Cutoff" parameter.
• The SCREEN regulator on the T402 transformer seeks the light horizontal line to be barely visible.

White balance adjustment

This operation is necessarily performed after adjusting the accelerating voltage.

• The antenna input of the TV is served a "White Field" signal and adjust the contrast adjustment to the maximum, and the brightness is 90% of the maximum position.
• In service mode, choose the "Line SVC 0" menu.
• Adjusting the parameters "GG" and "BG" achieve white balance in "light".
• Install the adjustments of brightness and contrast so that the screen is barely glow, and the settings of the parameters "RC", "GC" and "Sun" achieve a white balance in the "dark".
• If necessary, repeat the adjustment several times, achieving the optimal balance
• white.

The factory values \u200b\u200bof the parameters are shown in Table. five.

Table 5. Factory White Balance Adjustment Settings

Parameter	Factory values
RC	125
GC.	140
Sun	125
GG.	58
BG.	65

Adjusting focusing

This operation is performed in the same cases as the previous one, as well as with the deterioration of focus. Turn on the TV, served on its antenna login signal "Mesh" or "Test Table" and warmed for 15 ... 20 minutes. Then the Focus regulator on the line transformer is achieved the best focus of the image.

Adjusting the geometric parameters of the image

This adjustment is performed as needed.

• Served on the antenna television input the same signal as in the previous case.
• Before adjusting the "ARC" button, the "Standard" image format is selected on the remote control.
• Included in the service mode, and in it - select the menu "Unesvc2".
• Consistently select "VL" (vertical linearity), "VS" (vertical center), "VA" (vertical size), "hs" (horizontal), "SC" (S-correction) and regulate geometry Images.

Installation options

Adjusting options is necessary in order to configure the specific model of the TV. Setting options is performed in the "Option 1" and "Option 2" menu.

Table 6.

Option	The code	Function
Shi System	0	Only BG Standard (SA-)
	1	BG + Tai Dual (Asia)
	2	BG + 1 + DK (without NTSC 3.58, CF-, CZ-) models
	3	BG + DK + M (C NTSC 3.58, model st-, CD-)
CCTV.	0	Without cctv
	1	With system-CCTV
SCART.	0	Only Phone Jack or Carnera-in Jack connectors
	1	There is a jack jack connector
4 Key	0	6 buttons on the front panel (MENU, OK, VOL-, VOL +, PR-, PR +)
	1	4 Buttons on the front panel (TV / AV, ROTATE, PR-, PR +)
Eye.	0	Without Eye system
	1	With EYE system
Top.	0	Teletext is prohibited
	1	Teletext is allowed
H-Tone	0	OSD on a blue background
	1	Halftone background for OSD

Options and their possible values \u200b\u200bare shown in Table. 6 and 7.

Table 7.

Option	The code	Function	Microcontroller version
Lang.	00	Multilingual support	-
	01	English only
	10	Two languages
Lang-index	0	English	LG8993-27A / B.
	1	Countries of the former USSR
	2	Chinese
	3	Romanian
	4	Polish
	0	English	LG8993-28A.
	1	French
	2	Indian
	3	Arab
	4	Urdu
	5	Persian
	0	English	LG8993-29A.
	1	Indonesian
	2	Malay
	3	Vietnamese
	4	Thai
Curve.	0	Rapid rise volume	-
	1	Slow increase volume
TBS.	0	TBS Function is prohibited	-
	1	TBS function is allowed
Hotel.	0	The function is prohibited	-
	1	Function allowed

Typical malfunctions and elimination methods

TV does not turn on, the "POWER" indicator does not shine, lights up the F801 network fuse

Turn off the TV from the network and an ohmmeter check for a short circuit elements of a demagnetization scheme, a network filter, rectifier: TN801, TN802, C806-C810, VD801, T801, RT801, RT802, DB801. If there is no short circuit in these circuits, then an omeme is checked for a short circuit of the power transistor (out. 2 and 3 IC803). If the specified elements are good - the T802 transformer is dropped and check it on one of the known techniques.

TV does not turn on, the "POWER" indicator is not lit, the F801 network fuse is

Include the TV with the SW801 network switch and measure the +300 8 voltage to the output. 3 IC803. If the voltage is zero, then check the elements of the following chain: F801, SW801, T801, R811, DB801, withdrawal. 8-5 T802, FB803, output. 3 IC803. If the voltage is 300 V to the output. 3 is, and the converter does not work (no pulses with a scope of about 500 B out. 3 IC803), then check the external elements of the chip, providing its power in start-up modes and working (see description).

If the converter works (there are output pulses. 3 IC803), check the stabilizer 5 V (IC805). If it is working, then check MK and its external elements (see description and Table. 4).

The "Power" indicator is glowing, the TV is in standby mode and does not switch to the worker

First, check the ON / OFF signal (out. 5 IC01). If the high level signal (i.e., the TV is in standby mode), it mighted the protection of the streaming overload channel B + power supply.

In this case, the ABNORMAL signal to withdraw. 5 IC01 will be active (low). Turn off the TV and determine the cause of the channel overload in +. If the control signal is passive, it is possible that the MK itself is defective or the IC02 memory failed. The chip is overwritten and if the TV is still not turned on, the MK is replaced. If the ON / OFF signal (out. 5 IC01) is low, the Q807 key must be closed, and the 9 V stabilizer (IC844) is enabled.

No raster and sound, power supply

Perhaps there is no one of the stresses on the kinescope board and the Kinescope itself: HV, USCREEN, UHEATER. 180 V. Check the presence of these stresses, they define the absent and eliminate the cause. If there is no high voltage (there is no characteristic crackle while turning on and off the TV), then, most likely, the reason in the line scanning scheme. Check the presence of start-up pulses. 32 IC501, their admission to a pre-cascade on the Q401 transistor and the operation of the output cascade on the transistor Q402 (the collector should have a positive polarity pulses by a blank of about 1000 V). If the output cascade does not work, turn off the TV from the network and check all its external elements. If the impulses are there, and there is no high voltage - the reason in the string transformer T402.

Raster, sound and image are missing

Initially, the PC and video processor (IC501 chip) is checked. Control the nutrition of the chip (see Table 3). If there is no supply voltage of 5 V (out. 46), check the IC505 stabilizer. If the power is normal, it is fed to the input of the PC tract (output 11 tuner TU101) a test signal of 38 MHz with a level of 65 dB and control the passage of the signal across the path (see Description and ACS. 1, 3-5). Determine and replace faulty items. In the absence of a test generator, a video recorder or a video camera connected to the corresponding inputs can be used as a signal source, but in this case only the video processor is checked.

No color image in SECAM color system

Most likely faulty IC502 chip or its external elements. Set adjustment of saturation to the maximum level position. Check the nutrition of the chip (5 B out. 9 and 18. If there are no voltages - check the stabilizer on the ZD504, R531 elements), the presence of a video signal. 13 and 15 IC502, strovery pulses on an outline. 17, all external capacitors. If the elements are good - replace the chip.

TV works only through the LF

Check the power of the tuner A101 (33 and 5 V). Then is fed to the antenna input of the tuner with the generator the test signal, turn on the auto-tuning mode and check the corresponding control signals on the tuner outputs (see description). If there are signals, and the output signal if (in a scope of 0.25 ... 0.5 V) is missing, the tuner is replaced.

No sound

Check the power of the IC601 chips (20 B to withdraw. 9) and the absence of a blocking signal (high output potential. 3), the serviceability of the dynamic head and the presence of contact in the R601 connector. Then touch the metal object (for example, tweezers) an output. 5 IC601. If a background appears in the dynamic head, then UMPs are working. Otherwise, replace the chip.

In the television program reception mode there is no sound

Check the presence and passage of the audio signal on the following chain: an output. 47 IC501, Q507, Q151, F151-F154, output. 1, 2, 4, 5 IC151, output. 3 IC151, output. 53 IC501, output. 2 IC501. Determine and replace the faulty tract element.

No sound or image when working through the NF Login

Check the corresponding paths.

VideoTractors: PJ201, C251, output. 7, 8 IC251, output. 41IC501.

Sound path: PJ201, C227, Q221, output. 10.11 IC251, C257, output. 55 IC501.

TV does not react to the commands of the remote control

Faulty remote control. Initially, installed in remotely serviceable batteries. To check, a photodiode of the IR range is used, for example, PD-8K, connect its conclusions to the input of the oscilloscope, send the remote control to the photodiode and press one of the PD buttons. On the oscilloscope screen, there should be a pack of pulses with an amplitude of about 0.5 V. If there are no - check the health of the PD scheme elements: chip, resonator, output transistor and LED.

If the remote control is running, press one of the PD buttons and check the presence of an amplitude of 4 ... 4.5 V to the output. 1 RA01. If there is no signal, then the photodetector is replaced. If there is a signal, - IC01 microcontroller is faulty.

The image prevails any of the colors, the black and white image has a color color of the same color.

As a rule, this is due to changes in the parameters of radio elements and a kinescope due to their aging. To eliminate the white balance in the service mode (see "Service Mode").

A thin horizontal strip is visible on the TV screen.

Check sawmate impulses (SCS 9) on withdrawal. 24 IC301. If there are no, - check the C313 capacitor (STS 6) and all elements in the feedback circuit: C308, R314, R313, R306, R407, C301.

If the saw-shaped pulses on the output. 4 IC301 is, and an output output signal. 2 is missing (signal scope - about 45 ... 50 V), check the power of the chips (24 B to withdraw. 6) and the following elements: R303, R304, C311, R310, C310, V-COIL if they are working - replaced with a microcircuit IC301.

The size of the image vertically is small and not regulated in service mode

Check the elements of the volt supplement diagram D302 and C307.

The TV consists of the basic chassis of MS-049B, the CPT Board kinesk card, the PIP Board frame board, Side A / V Board boards, two dynamic loudspeakers deflecting the system (OS) and a kinescope.

As already noted, the basis of the basic chassis of MS-049B is the VCT49xyII type IC11 processor. The IF1 begging signal from the TU101 tuner output passes through the amplifying cascade on the Q104 transistor and the filter on the surfactant Z101 and enters the symmetric input of the processor - an output. 16 (IF In-) and 17 (if in +). With an outline. 27 processor and amplifier on the transistors Q103, Q102 on the tuner fed automatic noise reduction LNA. ARU signal with an output. 14 (TAGC) processor is fed. AGC tuner.

The tuner is associated with the processor on the digital control bus I 2 C through an output. 57 (SCL) and 58 (SDA) processor.

The IC11 processor is associated with IC12 microcham type 24C04 / 16 by digital control bus I 2 C through the same output. 57 and 58.

A beep of the left channel (or mono-sound signal) SPK-L or Mono-Sound with an output. 4 IC11 (SPEAKERL) processor is fed out. 2 IC601 microcircuits type LA42071 (LA42072, LA42152), the nitrogen signal of the right channel SPK-R - with an output. 5 IC11 processor (SPEAKERR) on withdrawal. 4 IC601 chips.

Mute Mute Sound Signal. 55 IC11 processor through diode D601 is fed. 6 IC601 chips. The microcircuit is powered by two sources: voltage +5 V (5V Standby) is fed to it through an output. 5, and the voltage is 16 V (S-VCC) - through an output. 7.

Output audio signal left (right) Channel Channel. 11, 12 (8, 9) IC601 chips and contacts 1, 3 (1, 4) P601 connector fed to the left (right) dynamic head.

The Key signal from the keyboard keypad buttons SW11-SW16 is fed. 51 of the IC11 processor, the IR signal from the reader of the RA11 is on the output. 50 processor, and the Eye signal from the illumination sensor (if available on the TV) - on withdrawal. 52 processor.

The KA75270Z type IC13 microcircuit performs the functions of the reset circuit and is connected to the output. 18 Processor (Resetq). To the output. 25 (Xtal1) and 26 (Xtal2) The processor is connected by a quartz resonator x11.

The LD11 indicator LED through the cascade on the transistor Q11 is given POWER signal with an output. 49 processor.

On withdrawal 60 processors are formed by the launching pulses of the lower case sweep of HOUT, which come to the database of the transistor Q402 of the pre-cascade of the line sweep. This cascade is connected with the output cascade on the Q401 transistor using the T401 matching transformer. The lowercase deflecting coils of the OS are connected through the contacts in and and the P401 connector. On withdrawal The 61 processor comes the HFLB feedback signal.

The supply voltage B + is fed to the collector of the transistor Q401 from the power supply through the winding 2-1 of the T402 transformer. The supply voltage is +33 B is fed to the collector of the transistor Q402 from the power supply in the H-VCC circuit and the primary winding of the transformer T401.

On withdrawal 84 and 85 processors are formed by the launch pulses of the frame scan of Vert- and Vert +, which are fed. 7 (VA) and 6 (Vb) IC301 type TDA4863A chips. Personnel deflecting coils OS are connected to an output. 5 (V-OUT) chips and to the case through contacts D and C connector P401 and connected in parallel
R313, R314 feedback resistors.

In order to exclude the lyuminophore of the kinescope in the absence of a raster, a cascade of protection on the transistor Q301 is used. If the Issuer Q301 is malfunction, the VPROT protection signal is formed on the Q301 emitter, which enters the output. 59 IC11 processor, and the outputs of its video sellers are blocked. Through an output. 1 and 4 IC301 chip feeds with voltages + 14 V and -14 V, formed by the line scan - rectifiers connected to the outputs 3 and 4 of the T402 transformer.

There is a Tilt device in the TV, which formulates the current in a special, located on the kinescope neck, which is designed to adjust the raster tilt. The device is made on the transistors Q180-Q187. Tilt signal is fed to the Q180 database. 56 IC11 processor.

The TV has a number of connectors for connecting various external devices.

Through the contacts of the JK201 connector, the following signals come to the inputs:

Video signal V-IN (contact 20) - on withdrawal. 34 (V1) of the IC11 processor;

The sound signal of the left channel L-IN (contact 6) is on the output. 12 (ax) processor;

R-IN R-IN Sound Signal (Contact 2) - on withdrawal. 13 (AINR1) processor.

Through the contacts of the same connector from the TV outputs, the following signals are removed:

Video signal V-OUT - with an output. 40 (Vout1) processor through cascades on the transistors Q505, Q507 to contact 19;

Signal Sound of the left channel L-OUT - with an output. 6 (AOUTL1) of the processor to contact 3 (L-OUT);

The sound signal of the right channel R-OUT is output. 7 (AOUTR1) CPU 1 (R-OUT).

If, instead of the SCART connector, the PHONO JACK jack is used to connect external devices, instead of contacts 20, 6, 2, 19, 3, 1 SCART uses the contacts V1, L1, R1, V0, L0, R0, the last one, respectively.

Through the contacts of the front connector PJ202 to external devices, the V video signal is fed to an output. 35 (v2) processor and sound signals of the left and right channels L and R to the output. 8 (AIN2L / AOUT2L) and 9 (AIN2R / AOUT2R) processor.

In the TV, as an option, the HEADPHONE telephone jack is provided. On it with an outline. 12 and 8 IC601 chips are served left (L-HP) and right (R-HP) channels. Also, as an option, it is possible to connect to the specified conclusions of this chip through the contacts of the CENTER SPK central dynamic head connector.

In the TV as an option is provided with the ability to connect the game console, which is installed for the HIC01 connector. We give the appointment of its contacts:

From contact 8 (VIDEO) A video signal is fed. 39 IC11 processor;

From contact 7 (AUDIO) Signal Sound is sent to an output. 8 processor;

From contact 6 (PRESET) A signal preset signal is fed. 53 processors;

From contact 5 (STICK), the "freezing" signal of the image and data on the output is fed. 54 processor;

From contact 4 (CLK) Synchronization signal is fed. 48 processors.

With an outline. 28 Processor IC11 on the transistor Q41 The signal on / off the game console is fed.

Signals of basic colors with an output. 73 (ROUT), 72 (GOUT) and 71 (BOUT) through the transistors Q501, Q503, Q504 and contacts 7, 8, 9 of the P902 connector arrive at the weekend
Dexplifiers located in the IC901 type TDA6107JF type CPT Board boards.

Control signal, proportional to the currents of the kineskop ray, with an output. 5 IC901 chips (IK) through contact 5 P902 connector and cascades on the transistors Q508, Q502 is fed. 80-82 IC11 processor.

The +185 B power voltage is fed to IC901 chip video detectors from the output cascade of the line scan through contact 1 of the P902 connector. The focusing (FOCUS) supply voltage and accelerating (SCREEN) electrodes of the kinescope and heater (HT) are traditionally fed on the kinescope fee.

The "Frame in the frame" board PIP Board is based on the ICP01 type SDA9468X microcircuit. Video signal PIP-Video (AV1) with an output. 42 IC11 processor through contact 1 of the P551A / R501B connector is fed. 26 ICP01 microcircuits.

External signals EXT-FB, EXT-R, EXT-G, EXT-B through contacts 16, 7, 11, 15 JK201 connector and contacts 7-10 P552A / R502V connector are fed. 11-14 ICP01 chips, and the FB-OUT, R-OUT, G-OUT, BOUT, formed, the formed signals. 15-18 Chips, Contacts 1-4 P502B / P552A connector are fed. 7578 IC11 processor.

Jumper J546, J547, J551, J574 and J524-J527 make it possible to implement one of the RGB signal transmission options: either from the JK201 connector to the IC11 processor, or from the JK201 connector on the frame of the frame in frame, or from the frame in the frame in the frame " on the IC11 processor.

The HB string synchronization signal through contact 9 P55M / P501B connector and the QP02 transistor is fed. 3 ICP01 chips, and VB frame synchronization signal - through contact 10 P551A / P501B connector and transistor QP01 - on withdrawal. 4 ICP01. Through contact 5 P502V / P552A connector, the supply voltage is fed +5 V.

The chassis power source is made according to the traditional scheme of the pulse source: for the models with a large screen - on the STR-X6757 chip, and for the small screen models - on the STR-M6754 chip.

The POWER signal in the operating mode through the transistor Q808 opens the Q807 transistor and the Q802 transistor is closed through the transistor Q803. When closing the last Optron, IC802 translates the power supply to the operating mode.

When you open the transistor Q807 voltage +14 V (14V in Fig. 8) is fed to power the TV nodes. When you go to the waiting mode, the POWER command produces an opposite effect.

The film block diagram is activated by the DEGAUSS command and is performed on the transistor Q805 and the RL801 relay, which allows you to demagnetize the kinescop both when the TV is turned on with the power button and when switching from the duty mode to the worker.

If the voltage rate is exceeded above the installed voltage rate, the transistors Q801 and Q804 are open, the ABN signal level varies with high to low and fed. 49 (POWER / ABN) IC11 processor, why the TV goes into the standby mode.

Television adjustment

Before adjusting the TV should be warm in operation at least 15 minutes.

Adjusting accelerating voltage

The TV or SECAM signal signal on any television channel and are included in the TV input of the TV. To do this, simultaneously press the MENU button on the front panel keyboard and on the remote control by pressing the ADJ button, you set the Line SVC Mode horizontal service line in it (In-Start Key).

Adjust the accelerating voltage by the screen of the SCREEN SCREEN transformer until the specified horizontal line disappears.

Press the TV / AV button Pow to exit the service mode.

White balance adjustment

With automatic adjustment of this parameter, the Jig adjustment mode is called in service mode. (When you press the Mute button on the remote control, this mode changes to the CPU OFF MODE mode, and "auto" appears on the screen).

A 100% white signal is fed to the television input. Adjust the status of a small brightness (4.5 FL) by changing the Cut R and Cut B levels at the CUT G level, equal to 60 conventional units, and then the status of a large brightness - by changing the levels of WDR R and WDR B at WDR G levels equal to 450 conventional units (Table 1).

Table 1. Initial data for installing white balance

Menu	Parameter	Range	Value

Repeat these adjustments to better fulfill each status. The quality of the white balance is estimated visually on white color on the screen or when measured using a colorimeter (Table 2).

Table 2. Color parameters when measuring colorimeter

Adjusting sweep parameters

A test table is fed to the television input. Included in the service mode and continue to adjust the parameter settings by selecting the SERVICE 1 section in the Service Menu menu after installing the Line SVC mode mode (In-Start Key).

To select a parameter, the CH ▲ and CH ▼ buttons are used, and to reduce or increase the data - the Vol◄ and Vol◄ and VOL buttons.

Press the ENTER button for further entry into adjustment mode. Before adjusting the PIP P parameters (PIP Position), you remember these sweep parameters in EEPROM by pressing the ENTER button.

Adjust sweep parameters:

Vs (vertical centering) - set the average horizontal line of the table at the level of the middle horizontal screen line;

Va (vertical size) - set the diameter of the inner circle of the table by 6-7 mm less than the vertical screen size;

VL (vertical linearity) - set the equality of the vertex and the bottom of the inner circle of the table;

SC (S-correction) - set the same vertical sizes of table cells at the top, in the middle and at the bottom of the screen;

HS (horizontal centering) - set the middle vertical line of the table at the level of the middle vertical screen line.

The initial data of the set parameters settings are shown in Table 4.

Table 4. Initial data settings for sweep parameters

Parameter	Range of values	N50HZ (PAL) mode Flat 21 "	N60Hz mode (NTSC) Flat 21 "

Adjusting options

Options are selected depending on the TV model. In service mode, select In-Start Key, and then sequentially select the Option1, option2, option3 and option4 modes to set the options options.

Input Options: Function is Yes, no, no - no. Select each function option with the CH ▲ and CH ▼ buttons, and then install each option (there or not) with the VOL◄ and VOL buttons.

Tables 5-8 are codes and functions of all options in four modes.

Table 5. Codes and features of options in Option1 mode

Option	The code	Selected feature
		Applied
		Not applicable

Table 6. Codes and features of options in Option2 mode

Option	The code	Selected feature
		Without AV2 function With AV2 function
		Without a DVD function With DVD function
		Without the SCART1 function With SCART1 function
		Without the Game function With Game function
		Without EYE function With EYE function
		Without the Degau function With Degau function

Table 7. Codes and features of options in Option3 mode

Option	The code	Selected feature
		Without Text function (200PR) With Text (100PR) function
		Without ACMS function With ACMS feature
		Without function i 2 sv With i2 SV function
		Without TURBO SEARCH function With TURBO SEARCH function
		Without Turbo Picture / Sound function With TURBO PICTURE / SOUND function
		Without HDEV function With HDEV function

Table 8. Codes and features of options in Option4 mode

Option	The code	Selected feature
		Without HDEV function
		With HDEV function

Troubleshooting

There is no raster

The reasons leading to this manifestation of the defect may be much. First of all, check the presence of voltage in + on the C833 condenser. In its absence, therefore, it is gradually checking the health of the power source elements: F803 fuse, DB801 diode bridge, IC801 chips, optron IC802, secondary rectifiers and stabilizers of straightened stresses.

If the voltage in + is available, check the presence of all necessary stresses supplied to the electrodes of the kinescope: anodic, focusing, accelerating, heat. In the absence of any of them, they check the condition of the respective nodes and chains, turning special attention to the T402 transformer and the quality of the discs.

Check voltage at cathodes of a kinescope. It can be overestimated (namely, in this case, the raster will not be) due to a malfunction, for example, IC901 chips.

Then check the presence of trigger pulses to the output. 60 (HOUT) IC11 processor. If they are not, then decide on the replacement of the processor. If the impulses are available, then check the condition of the preimary and output cascades of the lowercase sweep (Q402, T401, Q401, T402).

No image and sound

Check the presence of an image and sound in AV mode. If it is presented in this mode, the auto-adjustment mode is started and checking the operation of the tuner. Check its mode and serviceability. IF1 to an output. 16, 17 processor IC11. If necessary, the tuner will have to be replaced.

If there are no images and sound and in AV mode, check the availability of the on-screen menu when sending control commands. If the OSD function does not work, check the presence of output output signals. 71-73 processor. In the absence of these signals, check the presence of pulses with a scope of at least 1 B to the output. 40 processor and serviceability of secondary power sources, primarily stresses + 1.8 V (1.8V), +3.3 V (3.3V) and +5 V (5V).

No sound

First of all, check on the menu, the standard of the received signal (DK, BG, etc.) is correctly selected.

Check the availability of sound in AV mode. With its absence, check the presence of output signals. 4 and 5 IC11 processor. If there are no signals, check the presence of the required power supply voltages. 2, 19-21, 24 processors and their compliance of the values \u200b\u200bindicated in the diagram.

If there are output signals. 4 and 5 processors check their output. 2 and 4 IC601 chips, and then at its outputs (out. 8, 9, 11, 12). If there are no signals here, then check the lack of blocking the audio output channel. 6 IC601 chips and the presence of necessary supply voltages on its output. 5 and 7. If necessary, the IC601 chip should be replaced.

No image

Check the health of the cascades on the transistors Q501, Q503, Q504, Q510 and the IC901 chip mode of the Kinescope board. If necessary, replace the microcircuit.

The image is weak, dotted (in the image of noise in the form of noise, "snow")

First of all, you should make sure that the defect is present on all received channels, after which they check the condition of the ARU chain: an output. 14 IC11 processor, jumper J101, output. AGC tuner. If necessary, adjust the ARU voltage in service mode.

When receiving signals in the PAL system and in AV mode there is no color, in the SECAM system

Check the condition of the quartz resonator x11 connected to the output. 25, 26 IC11 processor. If necessary, replace it and condensers C10, C11.

When receiving signals in the SECAM system, the color disappears periodically, in the system PAL color is stable

With such a defect, reinstall the VID-P parameter in the service mode.

TV is configured only on the same channel

To troubleshoot a malfunction, you need to reprogram or replace the IC12 memory microcircuit. You are also tested for the power and control circuit on the TU101 digital bus tuner. In the extreme case, you will have to replace the tuner and re-configure the channels.

TV does not switch from duty mode to work

Check the operation of the power source when the output cascade of the line sweep is disconnected. To do this, the voltage source in + is loaded to the lighting lamp with a power of 40 or 60 W per voltage of 220 V.

With a serviceable power supply, check the presence of a launch signal to start the output. 60 IC11 processor at the first moment after sending the command to switch to the operating mode. If the indicated signal appears, and then disappears, then check the condition of the circuits from the specified processor output to the T402 transformer, as well as from the output. 4 of this transformer to the output. 61 processor. Possession of the converter conclusions, and perhaps it will have to be replaced.

If the output signal. 60 processor does not appear, then condensers C10, C11 and quartz resonator x11 are replaced.

Last but after checking the modes, the processor is replaced.

Raster compressed horizontally or vertically with a possible turn to the right or left

It is necessary to reprogram the IC12 memory chip, setting the nominal factory values \u200b\u200bof geometric parameters. You are also tested for the health of the elements of the output cascade of the line sweep and Tilt device.

On the left side of the screen there is a vertical strip of increased brightness

The replacement is subject to a C901 capacitor board of a kinescope.

Literature

1. Pavel Potapov. "Family of single-chip TV processors VCT 48xyi / 49xyi". Repair & service, 2009, №6.

Hello everyone!

This time we will repair TV LG. On the MC-059C chassis.

So, entered tV repair LG. With such a problem: the device is included in the standby mode, the indicator is digest., Naturally, glows in red, when switching to the operating mode (i.e., when turned on from the remote control), the TV is turned on for a few seconds, the lower case is started (the characteristic crack is heard ) And .... Again goes into the duty mode. When repeated, everything is repeated.

Well, we will produce tV repair lG do it yourself .

LG TV scheme , On the chassis of MS-059C, you can find and download to "" this site.

The first thing that was done after disassembling the apparatus is the discharge of a power capacitor (bank) in order to avoid unexpected shocks and all sorts of closures.

After that, a visual inspection was performed on the subject of "swelling" capacitors, burnt components and various mechanical damage, which did not give anything. At first glance everything was fine.

Next, using a multimeter, secondary power chains were checked: diodes, stabilods, stabilizers. Also was tested string craft - Transistor and elements in its strapping.

Then the output circuits of the line transformer were tested, which were also not led to anything.

Since the device briefly, but turned on, it was possible to check output voltages, which was and done. The secondary supply chains were quite workable, but a certain certainty appeared in the output circuits of the line transformer in the search for a malfunction of this TV.

When measuring supply voltage personnel sweep It turned out that the voltage is strongly overestimated - more than 35 V, although it should be within 25 ... 27B. The radio elements of this chain were checked: a diode, a restrictive resistor. Since the condenser in this chain visually suspiciously caused, it was decided to drop it from the board and check for the loss of tank and large equivalent resistance (ESR). ESR meter was used for this. The denomination of the capacitor's verifiable was 470MKF 35V.

After measuring the parameters of this component, it was revealed that the capacity was reduced to 150 ... 200μF, and ESR was resistance to more than 2 ohms. These parameters were the cause of overestimated voltage.

Since the supply voltage of the frame chip was dried well, it was logical to assume that she failed, which was subsequently confirmed. The STV9326 personnel chip was replaced with a new one, as well as a condenser 470MKF 35B.

After all of the above actions, a trial switching on the TV was performed, which turned out to be successful - the TV turned on and continued its work. Do not turn off the device, the voltage control was performed on the meal of frame microcircuit. This measurement showed that this stress is within 26 ... 27B, i.e. What should be.

So, the cause of the television malfunction was the loss of tanks on the electrolyte and, as a result, failed personnel microcircuit .

Next, the TV was put "for a run", which safely ended in a day of successful operation of the device. Now it remains to collect our television receiver and give it a happy owner.

17.) LG CF21D70. When turned on tV, 2-3 seconds it goes into the standby mode. The reason for the breakdown of diode 2N4148 (150V) according to the diagram D408. Already 3 cases for 3 months.

25.) Goldstar CKT-4905Televisor does not turn on. On the output instead of 115 volt 40. And on the voltage diode, and after the relay 40, the power supply operates without additional overload sounds. The diode of 115 volts is heated very much. When checking the secondary chains, no suspicious parts are detected. It turned out to be a faulty condenser C8075 160V33MKF. Checking the tank on the instrument showed the presence of a total of 0.23mkf instead of 33, the leakage was 50 ohms. The defect is found very often.

96.) Replaced the pierced TDKS in TV LG: 154-375F, after which I observe a strange effect: service information (the program number, menu lines) are twisted vertically 2-3 cm., The main image is normal, if you reduce SCREEN voltage TDKS twitch stops, also affects the brightness of the plot. It turned out that secondary voltage with TDKS for the power supply of frame overestimated- 29V instead of 24V. Put a sequential 3 diode in this chain and that's it.

142.) TV LG CF-20D30 When you turn on the power button, blinks the LED on the front panel once and nothing else - the BP has not started, there is no secondary output voltages. The electrolyte in the strapping of STRS5707 turned out to be the guilty (it is standing between the strs-ki radiator plates, C \u003d 4.7 MCF * 50B), which lost the capacity of up to 1 μF.

Power supply diagram from tV LG CF-20D33. LG disc can be ordered from us by mail.

153.) Gold Star (LG) 21D16. Something guys cleared in this model with a stereo sound at an additional board and TDA2009A. In some boxes, after half a year, a problem appears in the form of hoarse (fusing) and weak sound. The most optimal solution to the problem, without replacing the chip, was the mood of resistors 2 - 3 MΩ between the front and second TDA + 12V channel.

165.) Goldstar CB-28C22X. Narrow horizontal strip. Through 2-stabilion 24V, charred R304. After replacing the stabilion band remained, R304 is heated. Replaced out. k. Frame. Claw, the TDA8350Q resistor stopped sinking, but the strip is still. (The desired scheme is at hand as always). After analyzing the scheme, it found that 2 power supplies on MS: for 4 and 8 legs. 4 output D702 breaks, FR702 breakdown. After replacing the TV earned. (On the Internet, the document on the TDA8350Q can be taken on the website of the Promelectronics.)

249.) TV GOLDSTAR CF-21E60B. An external sign of a malfunction - h / z a few minutes after switching on - absence (dark screen) and sound in the presence of a raster, there is no reaction to commands from the remote control (from the TV panel is controlled), and in the future - disrupting video synchronization and spontaneous entry into the duty mode , and after some time, the functions are installed, and everything is repeated. Fault - in the LG8534-13A processor, part of the circuit of it is analog adjustment, switching on - shutdown, the decoder of the control commands when warming fails. Treatment - in secret |125, without dropping, applying a CPT layer and putting a copper plate on the size of the housing on top of the housing, tipped with a 65-watt solder, until the solder stopped sticking (8-15 seconds). Second successful recovery.

323.) LG CF-21K49 based on chassis MC994A. The symptom does not turn on or has a narrow vertical strip on the screen. Replacing Most likely the C411 334 / 200V capacitor is subject to.

350.) LG CF-20D30 (Chassis: MC64B). No reception on the upper meter subsidepoup. The fault was revealed rather unexpectedly. The main (on which was the challenge) was: the network button turned on (white, expensive 150r.). After replacing the switch and it turned out that there is no power supply voltage of the subband (instead of 12V only about 5V). Switching voltages are fed through transistors, the fluent check of which showed that everything is OK. Everything was built as if on the tunele (the usual eight-step). But something such a defect has never found me. Doubts were true. After winning the little things around the output of the tuner, it turned out that the transistor Q181 2SA1266 (P-N-P 50V 0.15A) is called on Omah as normal, and the coma has R (b-e) arr. \u003d 150k. He was Saluing 12V on the withdrawal of the tuner.

361.) LG-CF21D79 TV, a surprised color image of the C / B, as if there is no brightness. Replacing the video processor TB1238BN did not give anything. The SECAM TA1275AZ microcircuit was faulty.

391.) TV LG20 on chassis MS-84A. The defect may and unpropered (met once), but it seemed interesting to me. Slowly responds to commands, poorly configured and does not remember the settings. The service was all settings on zeros, but when entering proper initialization modes and output from the service, everything happened. Replacing the memory did not give anything. It turned out two of the eight resistances in the ceramic assembly instead of 4.7k showed ~ 2.4.

398.) Problem with LG chassis MC-019A. TV does not come out of the duty mode, if you measure the feed row-70 volts. First of all, see C820 220 MF 160 B, most often turned around one of the conclusions of the container, the molding of the conclusions is made under a very sharp angle.

415.) LG CF-21D70 (Chassis: MC-64A). When turned on - goes into the duty mode, and then goes out at all. The analysis showed that when supplying a network voltage, the output voltage + in smoothly rises to more than +160 V (norm + 125V), and then the internal protection is triggered and the generation of BP is broken. Analyzing revealed a defective electrolyte C824 4.7 MCF 50B (leakage, drying or an increase in internal. Sopir. On HF), set between 4 output. OPPARS IC801 and 7 output. STRS5707. What pleases is a timely internal defense that did not give to raise the murderous + B \u003d 160-180V.

420.) TV GOLD STAR CF21E20 chassis MC-41A disappeared sound. Quite quickly found that the volume control signal is almost zero, you disappear the output of the GS8434-16 control processor adjustment (3pin) - yells on the full, in AV mode, too, there is no sound, it would seem that everything is clear, it is necessary to change a percentage .- Not such a rarity. .. But after the replacement, the situation has not changed, flashing flash drives on obviously good, also did not bring the result. I had to start thinking .... we take an antenna - after 10 minutes the TV turns off - well, it is also a D.B. I leave with a signal from the ether by the same 10 minutes it turns off - clearly, there is no SOS signal (it is indicated here as ID-17Pin processor) - a constantly high level. Unfortunately, there was a stereotype of thinking, I apply low to this input, but the situation does not change, and there is no sound in the video of the video input ... In many television processors, SOS is integrated and estimated by the level, respectively and track it easily. Disappearing station signal level changes dramatically. Here the pulse signal is used SSC pulses. TRANSISTOR Q06- Signal generator ID "Thread" transition to-b, pulses at the id input were absent. AT tVx Samsung When the "Sweet Couple" and the R2M protection breakdown, the TDKS, in the upper part, was formed next to the output of the high-voltage wire, the Thurchishchi is about 5 mm and the spark in the core was called. Here, the TDKS restoration council was very helpful, a large drill drill a couple of mm deep into a large drill and fill in a white auto-service, after 3 hours you can turn on. Thus, 2 transformers per week.

441.) In the LG-21D70X TV, when you turn on, switching programs, the settings are not saved. After pressing the network button, the TV is included in the LINESVC mode, from which it goes into normal mode after pressing the DV / AV button. After replacing the memory of 24c02 and turn on the TV again switched to LinesVC mode, then after clicking on the remote control of the TV / AV button, the TV switched to normal mode with restoring the functions of saving settings. No additional actions for the "firmware" of memory microcircuits has not needed.

444.) Goldstar and LG TVs until 2000. Problems with the tuner, does not remember the settings, etc. It looks like a tuner outlet. Relieve earth contacts in the tuner.

487.) Malfunction similar to Tip 38. TV Goldstar CF20A80Y. When you turn on, you can hear the sweep, but there is no sound and raster. The fault lies in the m / s D402 (7809) of the production of KIA. It stands together with D401 (7812) on one heat sink, not far from TDKS.

450.) GOLD STAR CF-29C44 When you turn on the TV goes into defense. Replace the 78L08 PIP Roll on the PIP packet of the IC7P position number. Almost all malfunctions in these models are associated with this KPEnka.

526.) Goldstar CF-21D60B. No sound. Caught 2nd TV with such damage. Faulty sound adjustment over the 3rd leg of the LG8434-03C processor. We have a processor costs ~ 800r. If the client arranges the sound can be started on the adjustment of the contrast of this processor. Contrast Install optimal at its discretion. The only inconvenience is to adjust the sound through the menu.

553.) LG CF-20D60. It does not turn on, when measurements in the power supply, starts. Replacing capacity4.7MFX50V (is in the Radiator Radiator 5707).

565.) LG CF-21D70 Spontaneous transition to standby mode. On different channels in different ways, on some 5 minutes on others after 10 minutes. Try replacing the electrolyte of the position of C408 with a 160V1MF nominal value to 0 in the additives also been in leakage.

568.) LG CT-29K37E. When the relaxation of the power supply is turned on, in the working mode, it enters 5-6 attempts on-off. Replacing C808 (100.0x35V) in power supply, which is assembled on the STR-F6656 chip.

607.) LG CF21D33

Does not turn on. + 185V \u003d k.z. On Earth - the TDA6107Q (by the way, the recently defective batch of these IC in the Promelectronics with Nigal 3 in the lower right corner)

Quietly picks through D5072. We change and get a heartbreaking whistle !!! (Why did they fight for?). It turned out to be Korean saboteurs smeared from the inside OS new "superemboclem". But nothing, we are not proud people - we remove the OS, we rinse the place K.Z. The purest Russian alcohol, push the turns, put the isolent - and everything is in place.

634.) Goldstar SF-14A90B After a few seconds after switching on, the screen became bright white. The KIA7805 (5 V) stabilizer (5 V) stabilizer was faulty, it raised the voltage on its output to 7 volts during these few seconds.

654.) SUPRA CTV1485 MC-41A Chassis, it is Goldstar GF-14/20 / 21A80 MC-41A / B. In the secmeam there is no blue color, everything is OK. In the secur of the contour of the blue B-Y core L504, does not respond to rotation. Do not rush to change the TA8750AN chip, change the L504 and L502 circuit places connected through capacitors to the conclusions 35 and 29TA8750AN. In my case, after rearrangement of the contours, everything worked, obviously, the opposite of the feet (inside) contour was affected, then a small adjustment of contours is required.

658.) LG CF-21F89 chassis MC994A symptom - turns on for a few seconds then goes to ST-BY. During inclusion, the lowercase transistor has time to grow. Closed the lowercase coil in the OS.

754.) LG CF20F30. The fuse is burning. The diode bridge and the IC802 STR5707 chip is broken. The bridge spawned from the KD105, in the chip biting the 1st 3 conclusions, turned on, on 4 legs there are launch pulses. On the wires suspended the CT872A transistor (K-1N, B-3N, E-2N), turned on works. Tr-p put on a suitable radiator.

764.) LG CF-21D70 chassis MC64A. Spontaneously chaotically goes to the "duty". Not depending on time, heating or cooling. Replacing processors and memory results were not given. As a result of long searches, the defect was still identified - the C408 1MKFH160V C408 in the Q401 chain (Striquetteer). In the same TV does not start b.p. - drying C824 4.7MKFH50B in the chain of the optocoupler.

769.) Goldstar is assembled on the TDA3562A - a dark screen. Cause with -10mf / 250v, filter + 180V

770.) Goldstar CKT9905 - Pale image, + 112V is normal, and the supply voltage of video sequers + 180V is overestimated to + 270V - faulty C806 (47MF / 160V)

771.) Goldstar CKT9582 - White raster raster - leakage of the transistor Q906 (BF421).

792.) LGCF-20K51KE sample of the line transistor Q402 D5702 on the body, with a squeak. After replacement, the new one in a second flew out. Replaced Q402 on BU2520DX, they are more reliable. Careful checking of the strapping - the result did not bring. Disabled one pin of the lowercase coils of the OS and briefly turned on the TV. The screen lit up with a strip. Included briefly with OS. The screen lit up with a compressed screen. The transistor remained intact. Replaced OS. The result is positive. In the battlefield - defects did not find it.

802). Goldstar 21e60. Does not turn on. It breaks through the lowercase transistor, TDKS and the intersective closure in the deflecting system.

831). LG CF-14G20R. Weak sensitivity. In the image of interference and noise. It was to blame for the ugliness of the PF radio channel K6265K.

833). Goldstar 21E40. No high voltage. BP works, there is sound. The amplitude of the strings of the launch of the line scan on the basis of the preimary transistor CP. On the 37 foot of the video processor, the voltage is 0.4 V. Reduced R524 resistor with 3.9 com to 2.4 com. The voltage increased to 0.57 V and its amplitude became enough to open the transistor.

927.) Elekta CTR-1495EMK, Goldstar CKT-4442B, CKT-9322B. Chassis PC-05X2. (There is no image (may be vague to crawl), the screen is gray! The sound is. However, the causes of such a defect is the failure of the video signal switch, the microcircuit (GL3820, it is TEA2014A) is on the video input card.

928.) Elekta CTR-1495EMK, Goldstar CKT-4442B, CKT-9322B. Chassis PC-05X2. Defect - There is no color image in the SECAM system. Pretty frequent cause is a svc1 trimmed condenser (standing next to a quartz resonator) in the SECAM-PAL transcoder scheme.

929.) Elekta CTR-1495EMK, Goldstar CKT-4442B, CKT-9322B. Chassis PC-05X2. TV is not configured or setting up. Perhaps enough just to fall and suck the tuner. At least the defect took place.

930.) Elekta CTR-1495EMK, Goldstar CKT-4442B, CKT-9322B. Chassis PC-05X2. TV does not turn on, no indication. Frequently fails the transformer of the duty unit power supply unit. It is quite suitable for TP-8-3, or a 12 volt source similar to power. However, there was a case when the nutrition of the duty regime was, turned out to be a ring cliff of the ic2 (7805) :)

931.) Elekta CTR-1495EMK, Goldstar CKT-4442B, CKT-9322B. Chassis PC-05X2. No image, the screen of dark green color, visible "Loi", there is sound. The reason is the drying of the condushka in the circuit of the power of video amplifiers (the voltage fell as much to ... 119V, instead of 180-190 laid! The screen can be completely dark (the diet of video sellers was about 160! Volt).

932.) Elekta CTR-1495EMK, Goldstar CKT-4442B, CKT-9322B. Chassis PC-05X2. The screen is bright white (or gray), brightness, etc. The adjustment is practically not possible, the image only slips when the TV is turned on. Most likely this defect is a feature of block blocks with the ABB scheme. The cause of the malfunction is most often the video processor or the A1015 transistor on the kinescope board.

949.) Goldstar CF-20E20B when enabled tV There is no raster and sound, there is high voltage. Fault: IC402 Stabilizer (KIA7809)

956.) LG CF-20F30 chassis MS-64A turns off independently into the standby mode from 10 minutes to an hour. The whole fee is literally the word "perepakhana on elephants and on camels", not touched only the percentage of management due to its high cost. Cause of disconnection of the LG8634-16C processor for 20 output, through the ABNORMAL protection bus, the loss of capacitance capacitor C408 1MKF * 160V in the primary power supply chain TMS.

1035.) Goldstar LG CF-14/20 / 21A80V

Does not come out of the duty regime. When submitting a command to turn on, the voltage tries to grow and immediately drops to the values \u200b\u200bof the duty mode. Replace SE120n.

Sometimes it does not start bp. Starting chains should be sued.

1061.) LG CF-21F3. Instantly after switching on duty mode. No vsync on the processor. Fault-Open R15 4.7K

1062.) LG, CF-21F39, 2 years. When transferring from the duty regime to the worker, the smell of burned and the TV goes back to the duty. Open the lid, turn on. On the left side of the OS there is a smoke. We will deflect. From the inside, a breakdown between adjacent windings is found. At the junction of the OS body separated by the plastic slave. Isolation burned on 3-4 wires on each side. It is necessary to gently dilute, remove the "coals", lay the wires in the Cambrick and pour the sealant. Interestingly, after 1.5 months, the client complains that again the same thing. The smell appeared and turned off myself. Idle OS and I find the same breakdown only right now. But this is the topic for reflection. As written on the lid TV: Made in Ukraine from the components of the company LG. On the deflection read: Planzhuan OPC 29-90-54. Made in China. But there is another moment. Rubber wedges that are put under the OS, (which is usually 3 pcs. And stand at an angle of 120 degrees) here 4 pcs. Two vertically and two horizontally - accurate at the breakdown site. It seems that the rubber is not conductive, but heat could be bad, etc. Or the Chinese chase marriage. Life will show.

LG CF-21D33E, chassis MC-84A A similar breakfast of the deflecting system Pianzhuan QPC 29-90-54. Collected in Russia. When trying to replace the OS large breeding from the top and bottom. The breakdown occurs in double beds where the coils from two coils are closestly located along the horizontal axis. At these points, the turns are additionally fixed by a brown dipound. Through it beats the closure. After removing the "coal" and the compound from the opposite side, turning the turns, and the fill with the thermoclaus OS earned. The mixing fell at best.

I confirm this defect. For a week two tV. Osa Pianzhuan QPC 29-90-54. TV is assembled in Russia. We could not pick up another OS. Correction is not displayed. Restored old OKS!

1099.) Goldstar CF-14A74Y chassis MC41A after a thunderstorm flew Str-S6707 and optopara TPL721. After replacement and when checking b / p. On the external load of 60W, he earned normally. When turned on tV Channel 112V is planted to 85 and 90V, i.e. With a frequency of approximately 3-6 seconds, voltage jumps from 85 to 90 and back. At 85V, the screen is compressed horizontally and white screen, and at 90V work tV Normal, but Hood change in speakers and the lowercase transistor is heated. Faulty, it turned out to be a SE110 chip (it turned out that the reason for it after connecting to b / n external load 150W).

1135.) Goldstar CF-21E60B image distortion, no bright signal, color disorder. Replacing TA8750 and video processor TA8690, Tuner's opposite did not give anything. Voltage 12V and 9V normally. Faulty IC201 LA7222 - video card switch

1150.) LG (I do not remember model) from the memory microcham 24c02. If, after switching on, adjust the volume with the buttons on the front panel, then it is adjustable: 0-50-100-mute, if you turn off to the standby mode and turn on - poured white, the protection is triggered. Replacing the memory chip eliminated all faults.

1181.) Defect is a frame sweep in the devices:

LG CF-20E60K chassis MS-64A. Resistor R311 resistor 2.2 ohms.

1182.) Goldstar CF-21D10B An image and sound are missing, no noise, the dark screen. Almost both in secrets №487 and №949, but the service info is displayed (menu, regulators, channel number, etc.) Fault: In this case, IC401 (KIA 7812) is located on one heat sink from D402 (7809), not far from Territory transformer.

1184.) LGCF-20K50E chassis MC-84A. It is standing in the duty and does not turn on by any panel with the TV panel. It turned out to be one resistance of 4.7K in a ceramic assembly near the control processor in the cliff. He hung on the other side of the board a similar resistor: the box earned, but the raster is compressed vertically and shifted to the left. I did not climb into the service, I changed my memory, the raster became normal.

1200.) Goldstar CF-21D60. Raster slightly glows, no images, there is sound. The amplitude of the pulse V-SYNG at the output 2 of the processor is ~ 1V. Cause in the breakdown of ZD01 ZD01 (5V1).

1203.) Goldstar CK-20A80. No image, sound, OSD, video sellers are locked. Sometimes it does not even want to turn on the duty officer. Faulty m / s PPZ (** 24C04). Sweep clean and that's it.

1204.) LG CF-20F60. Received from another workshop with a diagnosis - faulty processor. The device was pretty original: first I started working, after five minutes I hung up and no longer wanted to work during the day. After having rested twelve hours, again began to work, hung, and everything was repeated again. Three resistors were faulty in the AR02 assembly, two of them were connected to the outputs of the I2C processor tires, and the resistor rates changed not to the large side, as it most often happens, and to a smaller one. Instead of the 4.7 com, 2 ... 3 com. For reliability I had to replace the entire assembly with ordinary resistors.

1236.) Goldstar CF-25C36X. The defect is no image and sound, weak noises on the screen. The suspicion first fell on the TDA9808 (radio channel), but the reason was the IC182 KIA7805 (5-volt nutrition TDA9808) -In 5-Volt squeezed 3.

1238.) GOLD STAR CF-29C32J does not turn on (after a thunderstorm). Through Tr-p Q301 2SB988Y Replacement NA2SB1294. TV did not turn on, there is no launch of the primary chain. Open R811 470K after replacement earned.

1253.) LG, chassis MS-64A, BP on the assembly of STR-S5707. Do not start bp. Leakage C820 220 μF, that on the 9th foot of the assembly. The capacity showed normal and during the transversion digital tester did not detect himself. The voltage on this leg was 7.2 V (instead, as it turned out, 7.9 V).

1278.) LG ModelCF-21K50E. Defect - there is sound, no images, dark screen. At the opening it turned out that there is a heat, voltages at cathodes, too. With an increase in the accelerating voltage, a bright narrow horizontal band appeared. The faulty turned out to be a personnel chip LA7830 and a resistor 1 in power supply to this chip. The microcircuit flew out of the increased voltage from the power supply (145 volts). The reason is dried electrolytes in the strapping of the power supply chip (STR-S5707). After replacing the electrolytes, BP began to issue 115 volts.

1285.) Goldstar CF-20A80V. Power supply does not start. Before the breakdown, the TV was badly started and disabled independently. The opposite of the annular crack of the TPI output no longer helped. On 9k STRS6707 Power Voltage \u003d 0. (Starting Chain). It turned out to be in leakage 9 input chip.

1303.) GOLD STAR CF-20D60B. There is no color in PAL, although the screen shows the inscription: PAL auto system. At the output of 40 pp IC501 TA8690 instead of 4 volts only 2.6. Cause: broken output 33 (SECAM-ID) M.S. IC01 GS8334-16A. It did not need to change the percent - it was enough to disconnect the defective output from the scheme.

1304.) GOLD STAR CF-20D60B. The color in PAL is missing and on the screen the inscription: the SECAM auto system. The output of 40 ppm IC501 TA8690 in PAL voltage 0.78 V. Faulty TA8690.

1305.) GOLD STAR CF-20E20B. Another addition to the secret of 509. The SECAM prevails red. Condenser malfunction built into the outline L502 E16A (R - Y). The defective had to break and replace the external 100 PF with a small adjustment circuit.

1331.) Goldstar CF-21D70R spontaneously turns into the standby mode at different time intervals, the protection of the "Abnormal" circuit is triggered. Detected Defect - Sight Condenser C408 1.0 x 160 V.

1367.) LG-CF-20D70K Returning to the secret 415. The degradation of C824 condenser in BP (4.7 * 50 V) first leads to difficulties with the inclusion tV, But we have a persistent people. Multiple on-off TV includes. And at the end, this will all end with a breakdown of strength MCS STR-S-5707. This fault becomes characteristic of the LG characteristic, along with the triggering of protection due to the 1.0 * 160V condenser malfunction in the pre-cascade of rows.

1377.) Goldstar Cut9322 chassis PC-05X2 (with a "flat kinescope" in the form of a removable glass). Pours milk, the image is not viewed. Replacing TDA3562A. All the same, the effect remained, although the weak image in the negative began to break through. When touched by a probe to 8 PINTDA3562A, a normal image appears. Conclusion - Power Walits through the C514 0.22MF x 50V capacity. Replacing helped, but not long. The next time turned on the effect repeated. The bust of the tanks of various quality did not give anything. The new conclusion is the input impedance in the input y (8 PIN) in the last years of the TDA3562A microcircuit. "I planted" this inlet of a 1.5 mΩ resistor. Everything works fine. Additional checking the previously dropped previously TDA3562A confirmed that it is killed, just at the entrance Y. A rare coincidence of 2 simple defects leading to the consequences of pathologies that some masters are called a "drum".

1390.) Goldstar (LG) CF-14E20B chassis MC-41B. The red light lights up, does not respond to the buttons, + B \u003d 43V. The reason is x01 (for some reason stood 3,6mhz). According to the scheme 4 MHz, because It did not turn out - put 4,43.

1398.) Goldstar (PC04A) 1). Not included in the operating mode Replacement C807 2). chassis MC41V Not regulated Sound Do not configure ROM replacement programs. 3). No sound replacement Q06 Adjusting L508. four). No setting of the first range Setting L508, 507. 5). The frequency of the replacement of the M-controller is due. 6). No y-Signal replacement LA7222. 7). The ZD811 replacement voltage is 7.5V.

1410.) Goldstar CF-21E20B and other MC-41B. Warming itself turns off, can blink the DR indicator. You can enable only after a while. If you first do not discharge the filter and touch the 5 legs of T802 (there is a ring crack), then you can burn strs6707. It is possible to burn "rushed" simply when removing the board - while it put it on the table (before that TV worked, but I waited for self-discontinuity ...). After replacing STRS6707, it is possible only through a lamp of at least 300W (weaker flashes due to a rapidly growing current consumption within a few seconds).

1411.) Goldstar CF-21C22X MC-46A. Blocked in the on state. The DR indicator shines, when turned on to the working - goes out. For a moment, the high and all other stresses appear (without reaching the norm), and immediately fall. When testing the output cascade of the string sweep is reduced + B \u003d + 15V - pulses without distortion, can be slightly underestimated, the current is normal. BP without suspicion. Long tormented. But Having hung another OS and -chdo-TV turned on with a narrow chaotic raster. The smell of Gary was heard here. It helped only a long thorough inspection of almost all parts of the CP. The corresponded was C401 434N200V. Communicated under the voltage and lost part of the tank. It was cracked, but in the board it was unnoticed. I think it would help testing not understated + B \u003d + 15V, but a gradual increase + in to a nominal. But the source did not turn out and it would be necessary to take action on tocoscience - so as not to burn the test generator itself.

1418.) Goldstar On the TA8690 video processor, channels are not configured. On those who were configured, setting up. The AFT scheme on the TA8690 processor after replacing the processor has become normal

1443.) Goldstar CKT9905 Fault: After switching on 5-10 minutes, the TV is disconnected, while the indicator scoreboard is GASLO. After analysis, the suspicion of the switch on the power relay is to turn off the power cascade. When driving a jumper working contacts relays, the TV worked normally. After replacing the relay, the TV earned again.

1444.) LG CF-20F89. MC994A chassis. Malfunction: does not turn on. Power supply to STRF-6707A (not to be confused with STRS-6707). In principle, no "pitfalls". The microcircuit itself is to blame. But a thorough call of her conclusions by an ohmmeter did not reveal any differences from the serviceable. The fee was taken out of tV. After replacing the BP chip, it started, but when switching from STANDBY to the working operation of five sec. Again went to Standby. Not immediately, but guessed to connect the deflection. It turned out that without it, TV does not come out of the "duty". This is nothing yet. On some instances of Funai without a connected deviation, a lowercase transistor knocked out.

1448.) LG CF-21S10E No framework, change the cadry chip TDA8351. Pour the image is compressed from below to half the screen, change the video processor TDA 8842, the image is normal, but it is not necessary to rejoice everything can happen, Avica-8005A will not be rejoiced by TDKS 6174Z-8005A. At times it breaks through.

1453.) LG CF14E40 No Settings Replace -TDA8362-5

1520.) Goldstar on TDA4601 when you turn on the TV, Q801 BU508D immediately fails. On TV on the lights there is no launch, but hear generation in TPI. Power on 9 H TDA4601 is underestimated, on the basis of BU 508 there are ripples of the wrong shape with the passing (i.e., the rectangular pulses of the normal form of OTS.) Replace from 801 10x16V. When the output is out of order, it is mandatory R 270 kΩ (from the number of TPI with a 4-leg 4601). There is no start, but sometimes can turn on, check 12V (nutrition 4601, 9-leg - should be 12V for start)

1521.) Goldstar on TDA4601 Comes from a periodically lowercase transistor (42-cm kines), power in + is equal to 140V and adjustable upwards. Check dropping R805 resistance running with 3-PIN TDA4601 on the + knob (must be from 6K2 to 12k) in this unit increased to 16K.

1522.) Goldstar CBS-6081 A very bright glow of the raster, reduce the brightness controller and SCREEN to TDKS fails, by replacing the BF421 on the kinescope board.

1624.) Goldstar CF-20D60B, chassis MC-41B When turning on "GET" BP on STR-S6707 and does not start. Synchronically with the "gouring" of the BP flashing the LED on the front panel TV. The ZD811 6.8V stabilion is faulty in the KTD2092 database.

1665.) LG - CF-20D73 ( chassis MC-84A). Apparatus after a thunderstorm. When the TV brought me to me, a processor reset chip (KA7542), a stabilizer 7805, was soldered (KA7542), the SE115 SE115 was soldered, the jumper to the video amplifier is dumped (TDA6107Q), the lower line transistor (D5702). I loaded the BP lightbulb - works (laid 115 at the output). By the way, when you turn on another light bulb, instead of the fuse, it starts, then the lamp, which instead of the fuse smoothly hesitates and the BP is cut off. And without it everything is OK. I sealed the power jumper on the video amplifier, put the roll-ku, the lowercase transistor for checking (BU208), heated the lowering scan through the lamp - caught fire - KZ in the lower case. Disconnected a video seller - no. It turned out to break through the power supply of the MS video amplifier (6 ohms). The processor (LG-8838-07D CXP86441) also turned out to be Duffle (breakdown on the reset 18 Ohm) also burned down the LED and diode, which is consistent with the LED. The LED put suitable in dimensions, diode - KD521. Replaced the processor, a video amplifier, put the lowercase transistor D5702, a discharge chip. The TV started, but instead of an image, a white-filled (with a pinkish tint) screen with reverse stroke lines. Indication on the screen is present. Replaced the video project (TDA8842). An image appeared, but filled with white, and with Loch-Ami. Reduced accelerating - the image is normal (across the NF). Does not remember settings - Memory (24C04) is shown. No channel reception - Tuner (TV8PSB02D 911A290E) is defective. Inside the tuner found two burnt tracks. Spot the jumper. There is a bad reception only on the 1st band. Replaced the tuner at 6700VPF016A. Du is not working - the IR receiver is defective. The IR receiver and the discharge chip set from the VCR - work perfectly. A small pink stain on a blue background in the center of the screen eliminated, twisting the magnets on the neck of the kinescope. And zipper got into the antenna - the mass of the tuner from the tuner burned down to the arrester with network wires, and another track, near the tuner. The service set up ARU, geometry, the white balance did not touch. Log in to the service - click simultaneously on TV and on the OK button. To switch the menu in the service, you must press the yellow button on the DU. Since there was no such kind of hand, I took advantage of Chinese universal do.

1678.) LG CF-21D70 (MS-64A chassis) - in Dezh. Mode turns on. When transferring to the operating mode there is a very loud and spectacular "shooting" in TDKS. Sparks fly in all directions. TDKS type 6174z-8004b is faulty. It is $ 18-22. On a schematic scheme chassis MS-64A is specified for the 214-375F type diagonally, which costs $ 8.5. I installed 154-375F without any structurally reprimor. TV earned. Geometry is normal. I set up screen and focus and that's it. But There is a disadvantage - the screen is pretty blue with blue lines of the program. As a result of the strips of the line transformer, Q514, Q513 and Q512 (2SA1266Y) in the video amplifier were faced. (instead of 6174z-8004b in another TV LG CF-21D70 stood 154-375E. SELLERS They also offer analogs of 154-194d ($ 10) and HR7906.)

1679.) LG CF-21D70 (MC-64A chassis) - when you click on the "Network" button, the dege indicator. The mode lights up for 2-3 sec. And goes out. Voltages with BP When you click on the "Network" button, they have nominal values \u200b\u200bfor 1sek, then they smoothly decrease to 0V for 1-2 seconds. (The lowercase sweep does not start while the read indicator is on, because the TV is pressed when the button is pressed. "Network" must be included in the day. Mode). Easp on the "Network" button, which feeds the power to TV only while you press it with your hand. The owner of TV said that TV was almost always in Dezh. mode, i.e. The network button was rarely used.

1683.) Goldstar CF-21E20B chassis MS-41. Titra malfunction, which usually run at the bottom of the frame, two ways so that they are impossible to read them, the picture itself with normal quality. I connect the test signal generator, I turn on the mesh via video input everything is fine, and in the HF through the antenna socket clearly seen a strong replay of vertical lines clearly, the malfunction lies in the radio channel. In the end, the malfunction was localized in the surfactant filter K2559, replaced with K2550.

1703.) Goldstar CF-20F60. The TV is immediately included in the operating mode, bypassing the standby mode. Voltage with BP is overestimated. IC801 optoxy.

1726.) Goldstar CF-21C22X chassis MC46A Power supply is assembled on STRS6707. In operating TV, it works without comments, but when you transfer TV to ST-BY mode from speakers, clicks, the frequency and volume of clicks may change, then after a while in the beat with sound starts to score TDKS, that is, trying to start. The LED glows fine .. I signed the voltage in the BP on the line in st-by I gave all 80volt, but I must give out about 40volt, that's why extraneous sounds appeared in ST-BY. A condenser in BP, 10MCF per 100 volt in the secondary chain, on the control of the optocouplers.

1729.) LG KF-21P10 When you turn on a white screen across the entire screen, the beam is defective, faulty TDA6108 and Stabilion on 5 legs (IK) 7V5.

1746.) LG CF-21F30K chassis MC 019A Power supply does not start: Replacing the TT2140 line transistor to 2SD2499 and TDKS 6174Z-6040C (there is marriage TDKS-OB manufacturers 09-10.2003).

1804.) Goldstar CF-14/20 / 21A80Y. Fault: Incorrect buttons on the panel tV. Volume is regulated by jumps. After replacing the memory microcircuit on clean, it earned normally. The programmer reads the memory normally, but gives an error when trying to write. When installing a new memory chip, with firmware from a faulty chip, again stop the panel buttons. But the old firmware is not required.

1805.) Goldstar CF-14/20 / 21A80Y. Fault: in semen - the predominance of red, in Palnorm. Broken the condenser built into the outline L502, hang 100 PF. In my case, it did not even need to adjust the contour

1820.) Goldstar CF-20E20B ( chassis MC-41B). Fault: 30 minutes after switching on tV the sound disappears. With the back lid removed, the TV can normally work unlimited long. The GS8434-16A processor identifies whether there is a television center signal from the sync pulse incoming to output 17 (ID) from the output 21 of the TA8690AN chip. In the absence of this signal, the sound is turned off, the level of the corresponding minimum volume is set at the processor's audio adjustment. The transistor Q06 (type Kt315 was fafeed, it was this transistor during the previous one repairsa) in the circuit of the data of the data of sync pulses. Who repairsi wrote in large quantities Soviet TVs knows this feature of CT315.

1828.) LG-CF 20F39 Fault: Vertical line. Cut capacity 0.364MKF N400V in the line. Condenser Manufacturer - Woo Yang

1833.) LG-CF14 / 20 / 21G20 / D70 / E60 on chassis MC-64A. Fault: A power supply is turned off. At first glance, all the details are intact, replacing the IC802 chip and the power transistor of the Q810 C3198Y power stabilizer with Stabilion in the database did not give anything. With a thorough analysis, a capacitor with a lowered C824 4.7x50B was discovered. After replacing the capacitor, the unit starts. By the way, in earlier releases of these models, there was a 220.0x5V condenser, there were no problems.

1848.) LG CT-20T30KE Fault: After some time, it starts losing 1 channel or all at once. Size vertical can be twisted. May turn off to the duty room. It can stop controlled. The sound disappears. Lowning scan, etc. disappears briefly. Replacing memory (can be pure) and quartz, - did not give results. Replacing the processor TDA9381PSN23 / 0701. When installing processors with other firmware, the TV does not exit from the duty mode, while changes the firmware in the memory chip, as it is pleased.

1849.) LG CT-20T30KE Fault: No color fell. Replacing quartz 12.000 MHz. Quartz, even new, may not match the tolerance.

1859.) GOLDSTARCF-14 / 20/21 / E20B (MC-41B). Malfunction: in a sequelock in red, sometimes it works fine. Condenser by running. 26 An5633 transcoder check the replacement.

1899.) LG CT-20T30KE. Replacing the TDA9381PS / N2 / 3/0701 processor (OICTMPH007B) on TDA9381PS / N2 / 3I0792 (OICTMPH010A). Everything is okay. Only the raster slightly shifted the vertically down. I had to look for the entry service. 2 OK buttons on the remote and television pressed within 10 seconds. led not to the input to the service, but to the inclusion of the self-test mode, after which the TV is GAS, but not in dezh

1959.) LG, chassis MC-41B. MV is working normally, the setup goes to DMW. The adjustment of the APCH circuit did not give anything. When measuring, it is noted that the TU on the tuner on the DMW range when setting is not smoothly varied, and "jumps." Defect - in the tuner.

1975.) Goldstar (LG) 21D16CF, 20A80Y Mala saturation fell, sms norm, replacement of the microcontroller GS8334-09C

1977.) Goldstar GF20D60B does not start bp (STRS 6707), the LED lights up for a second and goes out, chassis MS-1B ZD811 test break

1997.) LG CT-21Q42KEX chassis MC-019A The power supply does not start, the fuse F801 burns, when inspected, discovered the burned diode bridge DB801D2SB and C801 1000P 1KV capacitor after replacing the details of the TV, the TV earned.

2011.) Goldstar CF-21A80Y and other similar models. ATTENTION. When working with a power supply on the STR-S6707 chip, determine the accumulative capacity of 220x400V.

Fault: When you turn on the network, the duty mode indicator starts often. Faulty Capacity C826 220.0x35V in Q805 KTD2092 circuit.

Fault: Mala Brightness. When adding brightness accelerating with TDKS stops working the personnel: a narrow band. The stabilizer 9B turned out to be faulty: Powered by 1 leg of frame chip.

Malfunction: The TV could turn on or turn on. But if it turned on, when translating TVV, the duty regime, the GAS indicator of the duty regime, and the voltages at the outputs of secondary rectifiers increased by 2-2.5 times. Such a malfunction should be sought in the stabilization device. In this case, the R814 resistor (12k) in the Optocreter LED circuit was turned out to be faulty.

2019.) Goldstar 9322B ( chassis PC-05X2) When turning on, poured milk, brightness adjustments and contrast do not affect, suspended 8 legs of the video processor TDA3562A (analog KR1024H4) after 1 mΩ per +, it became slightly peeing the image. Replacing the microcircuit did not give anything. Digured transistors on the kinescope board - everything is OK!. I decided to replace the transistor Q907 2SA1015, the tester is called normally. After replacing the TV earned.

2021.) LG CF-20F39. Fault: No image. On the screen vertical strip. The capacitor in the circuit of the lowercase coils is faulty (it seems C412) with a rating of 0.36 IFC400 V - a break. You never think about the appearance.

2046.) LG CF21D30 chassis MC-64B After replacing TDKS, burnt R424 10K, punched D401. Fault: The TV starts and after a few seconds it goes into the standby mode. Each subsequent inclusion from the remote is reduced operation time. As a result, there was a broken transistor Q302, which supplies the Abnormal pulse on the 20 processor foot.

2093.) LG-CF21F60K, TDA processor 9381 PS / №2 / 3/0533 Malfunction: White inclined stripes on a dark screen, a weak snow appears when the antenna is turned off. From the words of the hostess - the image was gone when the camcorder is connected to the low-frequency entry N.C. Connecting 42 legs of the processor (input of external video) through resistance 1 com on the ground - restored the operation of TV in V.Ch. and on N.C.

2104.) Goldstar CF-14A80Y, CF-20A80Y, CF-21A80Y MC-41A chassis. Central Processor IC01 GS8334-09A (GS8334-09C) Malfunction: There is no sound in TV mode, there is in AV mode. During configuration, the channels do not stop (slips the stations). In the leak of Q06 2SC3198.

2112.) Goldstar CF20E20B Malfunction: No image and sound. When inspection found that there is no power of the TA8690 video processor. The reason is the stabilizer IC402 (KIA7809). After replacement, the TV earned.

2144.) Goldstar CF20A80 Malfunction: Enabled on any random program, when you click on the program's switching button, the menu crashes, etc. Replace Memory 24Co2.

2145.) LG CT-15Q91KE Malfunction: No Raster. According to the client: clung and went out. Sound is adjustable. Channels switches. When adding accelerating voltage, a gray raster appeared with the lines Oh. Video signal and OSD are absent. When switching channels - a small punching of the raster. Lines Oh stationary - do not react to the presence of a signal at the antenna input. Assembled on IS TDA9381PS / N2 / 3I0792. All power voltages are normal. FB, SSC et al. Pulses are normal. The blockage is tested from and to, including on the booth of a kinescope. The signal from the RGB outputs to the cathode comes normal. At the RGB Outputs (PIN 51, 52, 53) absolute zero. At the output of 50 IC (BLKIN - Black Current Input) + 7B. Schemes did not find, normal voltage is unknown. I tried to ground. Result: an image appeared, but with the lines oh. On red - flags, but the brightness is normal. The voltage at cathodes is the same - about 150V. Alternately closer RGB outputs for mass. After closing R, an image appears without red. The selection of resistance of the resistor between between the yk output (IS TDA6107Q) and the mass achieved the appearance of an image without lines oh. Nominal - 10 com. The image is bright, except for flags on red. Conclusion: The loss of emission of the red cathode of the kinescope due to the high-voltage discharge inside the pipe. As a consequence - locking cathodes IC processor microtext. So, do not forget to check the currents of the emission of cathodes.

2152.) LG CF-21F30 Fault: No startup. The power supply is assembled on STRS5707. Sight C824 4,7х50V.

2153.) LG-21D33 ( chassis MS-84A) Malfunction: 1-1.5 hours of operation The TV is periodically turned off into the standby mode for several minutes. Then goes into the duty mode and does not react to anything. To turn on again, you need to turn off from the network by ~ 0.5 h. The IC03 KA7542 reset circuit turned out to be faulty.

2185.) Goldstar CK21A90 Malfunction: Not included (shortly before breakdown turned on in times). In the power supply burst (1.5 mΩ is ringing) R802 680 com.

2191.) LG CT-25Q20RQ Malfunction: Not turned on, the duty regime indicator does not burn. In the cliff R830 (type of fuse resistor, a resistor at 0.47 Ohm) is supplied, it is necessary in the secondary, through it there is a member of +12 volts.

2196.) GOLD STAR CF-29C44 chassis MS-51A. Fault: when turned on after 2 seconds it returns to the standby mode, high appears. The device came after unsuccessful repairsbut. Changed the processor in it, the memory, all perepaked. AVSE because they did not read "Secrets repairsbut". Thanks to Boris [email protected] see the secret 450. Repairs took 15 minutes. Of these, 10 minutes were looking for a 78L08 position number IC7P (very inconspicuous) on the PIP. When measurements, at the time of inclusion at its output, 4V appeared instead of 8V. After its replacement, everything worked.

2203.) LG CF-21J50K, CT-21Q41KE chassis MC 019A Fault: The power supply does not start (gumbles). Replacing the line transistor TT2140 to 2SD2499 and TDKS 6174Z-6040C Analog HR8656 (if all the outputs of the line transistor short circuit is likely to change TDKS, marriage marriage TDKS-OB manufacture 09-11.2003) in my practice three tV LG Russian assembly of different brands, but with the same chassis And everyone "died" multipliers, and the windings are whole. And the TVs are still warranty.

2204.) LG CT-29K30VE chassis MC 022A Fault: No image and raster (black screen), there is a sound, with an increase in the accelerating voltage, the screen is greenish with the reverse stroke lines, when you switch channels, the image appears for a second, but without a blue shade and again disappears. The replacement of the video amplifierTDA6107JF has not changed anything, only after a detailed check of the strapping was with a diode diode diode on the kinescope board via blue color, after it was replaced by our MC-2 (native it was not) the image appeared.

2213.) LGRT-21FA32X Fault: The TV does not turn on from the duty mode. It turned out to be faulty C820 200.0x160.

2259.) Goldstar CF-20E20 (power supply is assembled on STR-S5707). Fault: to enable tV From a cold start, it was necessary to press the network button 10-15 times. To eliminate a malfunction, you must replace two containers: C820 and C825 both 220.0x35V.

2297.) Goldstar CKT-9902. Fault: When the screen is turned on from above, a black arrow is 5-10 cm wide, the direction of the arrow from left to right. Beautiful clearly painted arrow with a head at the end in the form of a crescent. 5 minutes after turning on the arrow disappears. The reason is the voltdabover capacitor in the frame scan 100mkf, set near the frame chip.

2307.) LG CF-21D30 Fault: at different intervals, it goes into the standby mode. Replace C408 and preferably change C311 and C824.

2320.) Goldstar CF20A80Y Fault: On the front panel, press the program's switching button, everything is displayed, only the channels are not switched. You must reflash the memory microcircuit 24c02 on the programmer.

2322.) LG CF-21D31KE. Chassis MC-019. The sound is accompanied by unpleasant pride, it seems that we are defective or loudspeakers or UNG. But check showed that they are normal. The cause of the malfunction was the audio processor chip TDA9859.

2335.) LG RT-21FB30M. Fault: No image, black screen, OSD is. The signal of the inverter does not pass, no video signal to withdraw .40 IC01 (CVBSINT) - breaks through the Q551 transistor (2SA1980)

2340.) Goldstar CF-21A80Y. Fault: APCH does not work, there is no signal identification. Defective GS8334-09C processor. Replaced with GS8434-03B. For compatibility with the native remote control, replace quartz 4.0 MHz by 3.6 MHz.

2384.) GOLD STAR ( chassis MC64A) Fault: After switching on + in jumps to 160V and the internal protection in STR-S5707 is triggered. Cause - C824.

2403.) Goldstar CF21A80Y Malfunction: Blurry (no focus). Checked the voltage with TDKS-norm, thought the tube is faulty, just in case, disassembled the block of a kinescope, the discharger on focusing is oxidized (all blue-green) copper remained, cleaned the brush, the TV earned the picture excellent.

2406.) LG CF-20J50K (MC-019B chassis) - Malfunction: The image is shifted to the right to 10 cm, the color and synchronization is. Open C505 (222J) filter 2 chain of the Appchif.

2426.) LG CF21F60K chassis 019A Fault: Dark screen, when adding accelerating a weak picture of the beam, there is sound, there are graphics. Faulty R456 Open ABL chain, after replacing the TV works.

2427.) LG CF21F60K chassis 019A TDA9381PSN23 is changing by NTDA9361PSN24I0793 (from LG CT-21Q42KEX).

2431.) LG RT-29FA55RB MC049A Malfunction: The TV does not exit the standby mode, it is necessary to replace TDA6109J. I tried to replace on TDA6108J: The TV turned on, but after 15min goes into the standby mode, it is necessary to replace it on TDA6109J.

2450.) GOLD STAR CF-29C36X. MC-51B chassis. Malfunction: The TV does not turn on from the duty mode, when the LED is turned on, the DR light lights up green, a second is red and so repeats. If you delete the Q803 (C3228) TV turns on, the string starts, but the dark screen. Faulty IC351 TDA8350Q. After replacement - "fold" on the image vertically due to an increase in the resistance of the discontinuous resistor FR359 (10 Ohm-0.5 W) for power +45 V. replaced, as well as FR351 (2.2 ohms) for nutrition +20 V.

2459.) LG CF-21D30 chassis MC-64B. (Power supply is assembled on STR-S5707) Fault: When you turn on the red LED on the front panel, it starts constantly flashing with a frequency of about 2 Hz, the relay clicks are heard into the tact. The TV does not respond to any remote control or on the control buttons on the front panel. Left included in this state. After about 10 minutes, a stream of smoke appeared. The malfunction was found herself. He smoked a small capacitor C813470PFC1000 in the secondary power supply chain (shunting the rectifier diode + c). After replacing the device, the operation of the device is restored to the condenser's parameters.

2474.) LG-CF20F39 ( chassis-MC994A) Malfunction: There is no launch of BP, breaks through the lowering transistor 2SD2449. In the strapping, I noticed "familiar" condensers from WOOYANG. One of them is 0.334x400 in the cliff. Although there is a vertical thread with such a malfunction, but the transistor does not knock out, so the condenser is 1600 volts (it also from Woo Yang).

2482.) Goldstar CF-20D70B Malfunction: There is no color in the SECAM system. As a result, the search would find a faulty Q5122SC3198Y. Sent the voltage at 13 output processor up to 2 volts.

2503.) Goldstar CKT-9742. SAA1293-02 processor. Fault: All signs of MDA2062 memory failure, (incorrect operation of the buttons on the front panel, etc.). Log in to the service with the RS-4 remote control, the Option bytes with the SERV button, the saving changes occurs automatically. Optional bytes exposed similarly to SAA1293-03 (as in 4UST).

2516.) Goldstar CKT9745 (PC-91A) Fault: does not turn on, the relay snaps. Faulty R805 -820K in BP.

2530.) Goldstar chassis MS-41A. The LG8634-02A microprocessor will be replaced by GS8334-03B. The difference only in the RGB strapping to supply signals to the video processor.

2531.) Goldstar chassis MC-51A. Fault: After a second, after turning on, it turns off to StBY. The famous Carrot 1C7P (7808) is not here, as well as the PIP board itself. After several unsuccessful hours, the IC806 (KIA7809) was discovered to revive the TV, which squeezed 4 volts at the output. After replacing the Kren8a, everything worked.

2536.) Goldstar CKT-4822. Fault: No image. Is there sound. The screen is lit only if you add accelerating. On the video processor TDA3561A, it seems like everything comes (it was changed to me, but the result did not achieve). The problem was in its nutrition. The device showed the last 12V on the first hoove. It is necessary to replace the electrolytic capacitor 330.0x25V, which stands in front of the roll to 12V after the diode (the power goes from the lowercase trance). It should be noted that after the above replacement, the TV earned, but bad. I had to replace some more electrolytes for nutrition of different cascades.

2553.) LG CF 20S10E. Fault: TV does not turn on to the operating mode. Composition: ICO LG 20S10EIC 501, TDA 8842 S1. The problem in the AR02 resistor assembly 4.7K 9N in the cliff: 0 Ohm. Replacing the AR02 4.7K assembly work is restored. Also 1204 1184. To the above, you can add to: Failure to turn on the operating mode occurs when the AR02 is out of failure. But when you fail the AR01, the memory is always a must! And when the AR02 is released, memory failure is possible, even the invention of the transistor of the line sweep.

2596.) Goldstar CF-20D60B, a malfunction: the network fuse is lit, the STRS6707 has failed in the power supply. Be sure to check and, if necessary, replace C825, C826. Otherwise, repeated failure of STRS6707 is possible.

2606.) LG-21Q42KEX chassis MC-019. Malfunction: no lowercase and frame synchronization, there is sound. Replaced TDA9361PS / N2 / 4I0793 processor (OICTMH006C).

2607.) GOLD STAR CF-14A80B chassis MC-41B. Fault: Reduction of the number of TV channels taken. The VH range is permanently included (+ 12V) on the tuner due to the Z003 (7V5) stabilion leakage (7v5) in the circuit of the Office Q11 DTA114.

2652.) LG CF20E20 Malfunction: not predictably turns off into the waiting mode (through ~ 3 ... 30min.). Cause: Loss of C408 1.0MKF 160V capacitance in the filter of the preimary cascade of the lower case. On a faulty consolidation, the cartoon showed 42V, after it is replaced by 33V. Oddly enough, the temperature of the output transistor was normal.

2698.) LG CF-21D30. Fault: The TV does not respond to the channel switch buttons, confuses the commands with the remote control, periodically goes to the standby mode. Faulty m / s PPZ 24C04. Replace to a new one, you can not stitched.

2734.) LG PT-53A82T Malfunction: "Embedded" reduction, specifically, does not boil the red beam on the cross in the menu options. Faulty STK392-120 datasheet, there are two there - on the blue and red projector. After replacing everything is fine. Attention - the real STK costs about $ 35.

2736.) Goldstar CKT-2190, Shivaki STV-206M4 collected on chassis PC-04A Fault: When you turn on the image, there is no sound and color, in automatic configuration skips the program, with warming the defect may be precipitated. After the diagnosis, it turned out: C409 0,22mk electrolyte reduces on the 5th foot TDA1940 according to the scheme.

2741.) Goldstar SKT- 2190. Malfunction: increased brightness, dimming on the left side of the screen with a change in brightness. Replace C4312.2x250V (Food of video sellers).

2762.) LG CF-20F39 chassis MC994A. Fault: entered repairs With the renowned TDKS, the resistor in the ABL circuit was also burned. TDKS once already changed someone. After replacing TDKS and R 33K, the TV started. When measuring the voltage of Pete. The stitching discovered its smooth increase to 150-160V protection did not work. The troubleshooting of the stabilization circuit in the BP revealed the dead IC801 optocoupler. Replaced with PC120, everything went as it should. String TR-P in this chassis Without a radiator, I consider it a flawless LG - eliminate! About WOOYANG capacitors will not be repeated.

2776.) Goldstar CFZ-9822. Malfunction: Filed TDKS 154-177E. This TDKS has a BOOOSTER output. Such TDKS is a deficit. There is an opportunity to change it to the distributed 154-177J. For minimum alterations: Drain on the TDKS core 5 turns of an isolated mounting wire, one end solder to 3 TDKS output (92 V from BP), the second end to + C705 100 x 63 V (booster). The winding direction is determined experimentally, if you confuse, nothing catastrophic will happen, just all secondary voltages of TDKS will be underestimated. Cut tracks from conclusions 5 and 6 TDKS and change them in places, (these are 12 and 24 V voltages.) You can not cut the tracks, and raise Resistors connected to them and spare back. Cut off the path from 4 output TDKS and connect it from the ground. Cut off the track from 7 output TDKS (not to connect it anywhere, since this conclusion in 154-177j - 40 volts) All other conclusions coincide. The number of turns wounded additional winding changes all secondary voltages of TDCS is directly proportional. (More turns - more voltage.) If in your case the voltage will be overestimated (or underestimated), pon the number of turns, under your own option. I picked up the number of turns and controlled the output voltages on the nutrition of video sellers (180 V), and then checked the rest.

2811.) LG CF-20D70 chassis MC-64A Malfunction: No Start Scroll Run. D408 1N4148 turned out to be faulty, although when checking the leak does not show, even a digital device.

2831.) Goldstar SF-21E20B. Fault: 30 - 40 minutes after switching on the duty mode, which is accompanied by a flashing LED on the front panel. The subsequent inclusion in the working mode was possible only after the "cooling", and for a while no more than 30 - 40 minutes. Cause in a bad solder of the pulse power supply transformer. After soldering all conclusions, normal operation tV Restored. The defect was detected only after a thorough inspection of the printed circuit board through the magnifier.

2833.) Goldstar CF-20D70B. MC-41B chassis. Fault: After a few minutes of work, a group of knocked rows appeared in the upper part of the raster, and when working from video input such a defect was not observed. The reason was in the IC201 switch chip (LA7222) - it "drought" video signal.

2834.) Goldstar CKT-9902. Chassis PC-04A. Fault: When you go from the duty mode to the working indicator LED goes out, but the device does not turn on. The reason was in the cutting diode D401. It is in the power chain of the preliminary cascade of the lower case. Replaced with diode D226D.

2851.) Goldstar CF-21A80Y, it is CF-20E20B chassis MC-41A. GC8334-09B processor 24C02 memory. Fault: When the power button is turned on, spontaneously switched to the operating mode to 89 or 91 channels. The buttons on the TV front panel included anything, except that they should display. After replacing the clean memory and settings to the channels, everything recovered.

2894.) LG. chassis MC-64A. Fault: After switching on, after a while, clapping sound appears and a raster starts to appear with this sound, which is gradually expanding horizontally to the full size. The diode flow D408 (1N4148). It is located next to the famous C408 capacitor via Abnormal chain.

2921.) GOLDSTAR-CF20A80 ( chassis MC-41). Fault: Quiet sound with distortion. The sound conversion from multi-standard in PC \u003d 6 MHz was applied. The SFE filter was faced with a 6.0 MHz to 49 TA8690AN leg.

2923.) LG CF-20F30 Fault: not started. Turn off the line-off check light. BP started the control light. All stresses appeared. However, the malfunction to identify in the divorce was failed. I had to return to the power unit. It turned out to be lost Capacity C824 4.7x50V to 2.8mkf

2925.) Goldstar Transformer 154 117V changes 154 357 F

2929.) LGModel CF-20F80 chassis MS-84A Malfunction: Entered repairs With a malfunction, there is no image sound normal, although the service information is displayed normally. With a large magnification, a very weak inverse image appeared on the screen on the screen along with the reverse stroke lines. The cause of this malfunction was the ZD741 8.2V stabilion along the ABL line. After his replacement, the picture appeared, the TV earned normally.

2948.) LG RT-21FA72X chassis MC-019. Apparatus after a thunderstorm. Fault: When you turn on for a second, an image appears and is immediately turned off into the standby mode. The TDA9381PS / N2 / 4/0703 processor (OICTMPH006B) is to blame. Successfully replaced by TDA9381ps / N2 / 4I0793 (OICTMPH006C).

2949.) LG CF-20K50E chassis MC-019. Fault: Does not turn on from duty mode. On 4 legs IC803 (STRF6654) 13 volts instead of 18.9 volts. Faulty C801 (100.0x35V).

2950.) Goldstar CF-21E60X chassis MC-64A. Fault: It turns off to the standby mode at different intervals. Cause: TRAPH D401 (1N4148) and transistor leak Q302 (2SC3198). After replacing the TV stopped disconnected.

2951.) LG RT-21FB30M chassis MS-019A. Fault: TV after a thunderstorm. When turned on, a raster appears, but there is no image and sound. The menu is turned on, all control buttons work. The setting is turned on, but nothing finds. The IC01 TDA9381PS / N2 / 3I0792 processor (OICTMPH010A) was to blame. After replacing everything earned.

2952.) Goldstar CF-21C22X chassis MS-46A. TV does not turn on. When you try to switch on, the indicator is pressed, but there is no voltage at the output of the power supply. In the power supply of the transistor Q812 (KTC1026). After replacing changes not. Further found transistor Q2 (KRC102M) in leakage (replaced by DTC114ES) and IC807 (KIA7812p) in the break. After that, the TV began to turn on, but the raster and sound disappeared when it disappeared, and the expansion continued to work. Found transistor Q105 (KRC102M) in leakage (replaced by DTC114ES). The device normally earned.

2954.) Goldstar CF-20A80Y chassis MC-41A Malfunction: With a cold start, the TV does not turn on (times from the 10th) hum of a pulse transformer, as well as an unpleasant hum in the dynamics, the output voltage is underestimated. It turned out to be dried capacitors in the power supply C815, C820 10.0x100V, C826 220.0x35V

2956.) Goldstar CF-20A80Y chassis MS-41A Malfunction: When you turn off the TV from the outlet or the power button, the settings for factory (brightness, contrast, turning on and off, and turning off TV) were faulty turned out to be IC02 24C02P

2961.) LG RE-29FA33X Malfunction: Periodically disappears the image and after 5 seconds. Walks in defense. Installed the disappearance of personnel. The reason in the cold solders of the TDKS legs are all but installed on the ripples. TDKS's legs are closed with a plastic frame under monoplag.

2971.) LG CF-20E20 Fault: TV does not turn on, the LED does not shine. Discovered, k.z. Powerful transistor in STR S 5707, leakage 120 ohms in 4N35GV optoprone between 4 and 5 legs. C820 220MKF 35V and C825 220MKF N35V- changed its containers. I replaced everything, the TV does not turn on, the LED does not shine. I measured with a meter of C824 4.7MKF for 50V - the norm, but ESR is more than 30, replaced C824 and the TV began to work.

2972.) LG CF- 21J50K chassis MS-019A Malfunction: The TV is lit, no reception on any channel, no sound. Low frequency TV is running. In service mode tVAs for the selector and IF, corresponds to tabular data. Checked the oscilloscope of the data bus and synchronization bus, rectangular pulses filled with higher frequency are available. The voltage of the selector of the channels corresponds. Disconnected if - selector, filed an IF from another tVThe image appeared. Using Lasp- 03, check the IF is impossible, a small signal level is unable. Replaced the selector and the TV began to work.

2986.) LG CF20E20 Malfunction: The TV works, but on different ranges with different intervals, goes into the duty mode. By clicking the program switching button on the console, the TV is open again 20 sometimes 30 minutes. On the IC01 processor on the 20 leg, Avnormal changed the voltage and translated the power supply into the duty mode. C408 1.0x160 volts, in my case: C-meter showed a normal container, and the ESR meter is greater than 30 ohms.

2988.) LG 20E20 MC-64A chassis. Fault: The power supply is not turned on to STR-S5707. The reason is the loss of capacitor capacitor C824, which is on the 7th leg of the chip. Apparently this defect is due to a not quite successful place of its installation - between the ribs of the radiator.

3038.) LG CT29M60VE ( chassis MC-022A). Fault: increased horizontal size. TRAPH CONDENSER C407 (stands parallel to the bottom diode of the line modulator). Relieve Q302 (E / W regulator) were ring cracks. Perhaps this was the cause of the condenser's breakdown.

3048.) LG PT-53A83T. Malfunction: Blue beam mixing is broken. The observation and increasing range of resistors R2002-5.6 0m, R2003-3.9 OM, both 2 W, due to the malfunction of the IC2001 chip (STK392-120) on the board. As a result, the fuse F 833 (4a / 250v) on the board, the power circuit (-20V) of the display, which does not turn on, like the entire TV. Replacement IC2001 and F833 - repairs Finished.

3051.) LG CF-20K50E chassis MC 84A Fault: When you turn on the duty mode, the current overload is turned off, the TV is turned off and again trying to start, the LED flashes. Turning off the diode for nutrition 16 volts of the TDA8351 frame chip, the TV is switched on without frame scan. The replacement of the microcircuit did not give anything, the defect was repeated. I checked the power with TDKS 45V and 16V under load, by eliminating the interstitious closure of TDKS windings and filters, all normally starts. But it is worth a supply voltage on TDA8351 goes into defense. OS swed up, the blockage was tested many times. Only after the removal of the transistor Q02 KRC102M on the circuit of the exhaust pulse (V-SYNC) TV has become a slave ...

Tuner (TU181).

Microcontroller (IC01).

Photodetector (RA01).

Upchings, execution, video processor, Pal / NTSC decoder, specifying frame and lower case generators (IC501, x501, x502).

Decoder SECAM (IC503).

Delay line (IC502).

Sif-converter (Q651 - Q654, Z650 - Z654, X650).

Teletext module (IC01T- IC04T, H01T).

Frame scanner (IC301, VDY).

Lock scanner (Q401, Q402, T401, HDY).

LF amplifier (IC601).

Block "Karaoke" (IC1001, IC1002, IC1004, IC1006, IC1601).

EXT-TXT switch (IC202).

Switch TV / AV (IC201).

Power supply (IC802, T802).

Stabilizer +5 in the duty regime (IC840).

Kinescope board (Q901 - Q903).

Gold Star TV Principle

Consider the principle of operation of the TV on the structural and concept schemes.

Image and Sound Signal Tract

The basic chassis of the TV is the chassis type MS-64A. Structurally, it is made in the form of a horizontally installed circuit board, on which the above elements and modules are located, with the exception of the Karaoke block and the kinescope board.

A television signal enters the antenna input TU181 tuner (p. 55). Setting the tuner with voltage synthesis is carried out using the VHF-L, VHF-H VHF-H, UHF range of signals, which come with an output. 41, 42, 43 IC01 microcontroller (p. 52) and control the keys Q180 - Q182. Through these keys, the high potential is fed to the appropriate conclusions of the tuner (LB, HB, UB). The setting voltage is formed to withdraw. 14 IC01 as a sequence of pulses with a variable duty, is converted by a filter to Q101 to a constant voltage, changing within the OS-31B, and enters the TU tuner output to make a smooth setting in the selected range. At the output of the AGC tuner, the ARU signal arrives, which is formed by the IC501 microcircuit (out. 47). The depth of ARU can be adjusted using the VR501 potentiometer.

As a result, an IF 38 MHz signal is formed on the output of an IF of the tuner, which through the Z101 filter, which determines the necessary response of the TV radio channel, enters the output. 45, 46 IC501 (p. 53). The microcircuit includes an input path, sound, video retractor, a sound demodulator, a synchrose corrector that specify the frame and lowercase generators, the PAL / NTSC decoder, the video processor.

With an outline. 46, 47 IC501 The signal comes to an adjustable ARR, controlled by ARU scheme. The ARU scheme produces an external AGC signal that is removed from the output. 47 IC501 and enters the output of the AGC tuner. The R187 divider, R188 sets the reference voltage level of the ARU, the C186 condenser is filtering.

I can modulate an AIDS signal using an amplitude detector and enters an output through the amplifier. 7 IC501. The VL501 circuit is the reference for the demodulator. The same circuit is used to work the APCH scheme. The APCH signal (AFT OUT) is removed from the output. 44 IC501 and via the Q515 emitter repeater enters the output. 11 microcontroller IC01.

The mixture of the video signal and the sound of the sound through the Q503 repeater arrives on the division frequency times scheme.

Filters Z501, Z655, Z656 Block the passage of the Sound Sound signal to the video signal processing path input (out. 13 IC501). The Sound Sound Signal is highlighted by Z651 and enters the path processing path of the Sound Sound Signal. 5 IC501. If the IF sound 5.5 MHz, 6.0 MHz, 6.5 MHz, then the signal is converted using the circuit on the elements Q650, Q851, Q654, Z652, Z653, Z654 in the time of the hour, the works of the IF sound path and also enters the output. 5 IC501. The Sound Sound Signal enters the adjustable PC amplifier and from it to the frequency detector. A demodulated beep through the Int / EXT switching scheme enters. 51 IC501, from it to the ONLC IC601 entry either on the Karaoke module.

The demodulated video signal through the INT / EXT switch enters the video signal processing path. It is divided into a bright signal, color signal and frame and lowercase synchronization signals. If the signal is transmitted in the PAL / NTSC system, decoding is performed by the IC501 chip. The reference frequency of the generator with the PLC is set by external quartz reson, the torus and condensers included in series:

X501, C523 - in the NTSC system 3.58 MHz;

X502, C524 - in the PAL / NTSC 4.43 MHz system.

The interface diagram (inside IC501) produces a reference signal for the operation of the SECAM decoder and a signal for the automatic system control circuit. High level 5 in permits the operation of the SECAM decoder, and the low level of the PAL / NTSC decoder. The output signals de encoder PAL / NTSC R-Y and B-Y are removed from the output. 30, 31 IC501 and enter the color transition corrector input and the delay line (out. 19, 16 IC502, p. 53). Here are the outputs R-Y and B-Y secam IC503 decoder. The IC502 microcircuit processes the colorless signals, reducing the duration of their fronts and performs the necessary delay in the color-based signal. To synchronize the operation of IC502, IC503, the IC501 microcircuit generates a SSC gautting signal that is removed from the output. 38 IC501 and comes to the specified microcircuits. From the output of IC503, the colorless signals come to the IC501 video processor input (out. 28, 29). Signals are fed on the fixation scheme, saturation adjustment, the PAL matrix, where the GY signal is produced and then three colorless signals and the brightness signal arrive on the matrix R, G, V. The output signals of the matrix are fed to the fixation and selection circuit R, G, in signals ( EXT-IN) and from it to withdraw. 18, 19, 20 IC501. Contrast adjustment signals, brightness, saturation, clarity generates the IC01 microcontroller (out. 6, 7, 5, 8) as a sequence of variable duty pulses. These signals are converted into constant voltages, whose value in the process of adjusting the parameters varies from about 5 V and come to adjust the output. 25, 17, 26, 14 IC501. Further, the R, G signals, v through the buffers Q512 - Q514 go to the output videos Q901 - Q903, located on the kinescope board (p. 49). Restricting the current of the beams of the kinescope is carried out by ABL signal from the lower case block. A voltage is formed on the C404 condenser, the value of which is proportional to the current of the kinescope. When the specified current value is reached, D501 diode opens and the output potential. 25 IC501 (contrast adjustment) decreases, which leads to a decrease in the amplitude of the R, G signals, at the IC501 output.

The IC501 chip has an input for connecting external signals R, G, V. The following signals are served here:

service signals indication of modes R, G, B, FB from IC01 chip;

the R, G signal, in from the IC202 chip (p. 54), which in turn commutes teletext signals and signals coming from the SCART connector. Switching control is performed by the FB3 signal, which comes with an output. 19 IC01T on withdrawal. 15, 12, 10 IC202.

In addition, the IC501 has inputs (out. 15, 6) to connect video and sound signals from the LF input. Switching TV / AV mode is performed by an output signal. 40 IC01. The high level corresponds to the TV mode, and the low - the AV mode. The signal enters the output. 2, 4 IC201 switches to which signals from the LF input (SCART and Phone connectors) and signals from the IC501 outputs (TV-CVBS, TV-SOUND) are sent.

The output signal of the image CVBS-T is removed from the output. 8 IC201 and through the IC01T chip (out. 3 - input, output. 2 - output) enters the output. 15 IC501. Output Sound output. 11 IC201 enters the output. 6 IC501.

The TV is equipped with a conventional monophonic unch, built on the basis of a micro scheme TDA2006, or UHC, built on the basis of a two-channel UHC chip TDA2009 and the MO "Karaoke", built on the GL4558 microcircuit, SHA1644.

In the first version of the audio signal. 50 IC501 enters the output. 1 IC601, is enhanced to the required power, removed from the output. 4 IC601 and enters the dynamic heads for playback. IC601 power is carried out from the channel +25 in the power supply. The scheme on the C610 elements, Q601 blocks the passage of the audio signal to the IC601 input until the image appears (before the operation of the channel +12 in the string scanning unit).

In the second version, the TV is equipped with a "karaoke" module and two-channel UNG (p. 51), which is used in mono-mono mode (the inputs IC1601 are connected parallel. The karaoke module is built on the basis of two microcircuits: IC1001 type GL4558 - 2 operating amplifiers and IC1002 type SHA1644R - "Echo Processor". The IC1001 microcircuit is used as a microphone amplifier. Between the output of the first and input of the second OU, the signal level controller from the VR01 microphone is set. Next, the signal enters the "Echo Processor" input IC1002 (out. 14) and from its output (out. 13) is fed to the input of UNG. Using the SwC01 switch, you can disable the "Echo Processor". The audio signal of the radio channel (out. 50 IC501) via the P1003 software connector is given to the input of the first IC1004 (out. 6). This is the sound signal from the "echo processor" IC1002. Output signal (out. 7 IC1004) can be blocked by the Mute signal from the IC01 microcontroller (out. 39). Next, the beep is fed to the second IC1004 (out. 3). From its output (out. 1) the signal enters the power amplifier IC1601 type TDA2009.

The power of the module is carried out from the channel +25 in the power supply of the TV. The module has an integral stabilizer IC1601 type 7812 to power the IC1001, IC1002 chip, IC1004.

The kineskop fee is a module on which three identical video amplifiers are located. Consider the principle of operation on the example of the channel R. The video signal enters the base of the transistor Q901 included according to the circuit with a common emitter. The amplifier is covered by feedback, the depth of which, and therefore the transmission coefficient can be adjusted using the VR904 potentiometer. The Q901 base is connected to the reference voltage source. The VR901 control allows you to change the operating point Q901, which means adjust the black level on the collector. C902, R922 chain adjusts the frequency response of the Cascade in the RF region. The output signal is removed from the collector Q901 and enters the cathode of the kinescope through the restrictive resistor R907. The power of the R, G video amplifiers, is carried out from the channel +180 in the lower case block.