LG TV Repair: Common Faults and Solutions.

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LG Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem	Solution	By
LG	LG21FJ8RL	This TV kept skipping channels	C 20 shorted on the key line killing the 4.9v	Replace c 20 0.01mf	Elias tv Natal R\|N
LG	32LK330-ZH EAX63985401-6	Does not start, instead of 24v and 12v, the voltages are 14v and 7v, respectively, and the power supply goes into protection.	Exhausted capacitor c112, c112 (220pf/1000v)	Replaced by 330pf/1600v	VITIKI
LG	32LA613B	No sound, image ok	3403 resistor loose	Resoldered, problem solved	Ednei Franco
LG	42PX4RV	TV takes a while to turn on the stand by LED	Several swollen capacitors, depletion of capacitors over time	After changing several swollen capacitors, the biggest culprit was the c122 of 10μF by 50v	MAIATECH
LG	29FS4	Vertical folded at the top with colored lines and two fingers closed at the bottom	Defective deflector	Replace the same	jcgiantomaso
LG	21FU4RL CW81	Turns on and off, if you try to turn it on several times it turns on with the vertical closed	R311 30kω, r305 12kω		Joaomvjr
LG	MCD-504	No audio	Broken printed circuit tracks	Once the lines on the double side of the printed circuit were done, the audio started working again	charlotniu
LG	CM9750	League appear no d-protec visor	I found one of the MOSFETs shorted on the front R output, I changed the device, it worked, tsound was no audio on that output that I changed, in a few seconds it went into protection, 5-d-protec appeared on the display, the ic702 -irs2092s was also shorted, I changed the audio, solved it this output worked	Defect resolved	Eletrônica Walter
LG	CM9750	This stereo arrived at my workshop with the following defect. It turns on, everything works normally, when the volume increases one of the boxes starts to install them in one of the speakers	I did the test to find out if it was the speaker not working normally, I did another test I disconnected the outputs and tested them one by one with volume at 10 - front l/woofer 1 and sub this output works normally, on the front r/sub it is ok I found the problem was woofer 2 of this output which was possible to install them, I opened the device and tested the MOSFET of this output, it was fine, I replaced the ic704-irs2092s, solved, the audio normalized and stopped installing them, the problem was in the ci.	Defect resolved, device is working perfectly	Carlos
LG	42LK450	Whitish image	Smd ceramic capacitor on tecom c157 board	Replace or because tsound was little heating near the c.i u6	davi PEIXE-BOI
LG	14CPK42	Turns on and off if the score increases when the vertical is closed	R-313 (82 k) aberta	Replace	LUCIANO
LG	DH4130S	Turning off after 30 seconds, and no sound	D926 shorted on the power supply board	When replacing d926 the device worked perfectly	REAL ELÉTRON CARVALHOS MG
LG	29CC9RL	Audio takes time to come	Replace capacitor c808 470/25v		eletronica 2.0
LG	CM9750	League appear no d-protec visor	This defect is in the output, I tested the power supply I found a change in the photocoupler, I replaced all pc901/pc902/p903 and pc904 el817 with leakage, in the output I found a short q711 and q712 - irf6775 smd I bought the original and put it in, everything was ok	Defect resolved	Eletrônica Dolby
LG	29FE8RL CW62A	+b of 110 volts and other power supplys are pulsing and the TV does not turn on, it appears that tsound is a short in the horizontal output.	The defect was that r801 in the power supply primary was altered, with its value being 28k and changed to 68k. It was just a matter of changing it and the TV stabilized all the power supplys....		Antonino Matos
LG	29FE8RL CW-62A	It turns on and makes a noise as if it were flayback and then turns off, a symptom of horizontal synchronism.	Check for possible cold welding on the horizontal driver transformer.	I cold welded it and it fixed it, good luck.	Eronaldo (erontec)
LG	W1953T	Does not turn on - panel LEDs blinking	Damaged power supply capacitors c205, c204, c301, c206	Replaced components	Francelino Guilherme
LG	29CC2RL	Power supply pulsing, horizontal starts and disarms the relay. mainly cold, when first switched on	C840 22nf 50v		Johnson
LG	14FK3RB MC059D	With normal sound, but no image	Excessive video amplifier gain	Put a 3k resistor on pin 62 (vif ground) to pin 63 of ic 501, do the automatic channel search and that's it.	Falcao
LG	29FS4RLG CW-62A	When you turn on the horizontal, it shrinks and little by little returns to normal, and depending on the channel, the horizontal varies.	In my case the c407(47n/630v) had no capacitance.	Replace the capacitor c407, and re-solder the entire board.	Capiroto