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	21FU6TL	Doesn't start	Capacitors in positions c25 and c 515 shorted	Exchanging them	Airton Filgueira
LG	50PH4700	With sound and without image	Replace q401 and q402 both 30f133 also replace c417 and c418 both 2.2nf at least 1000v		giovano eletronica
LG	55LY540S	LED bar, blinks and goes out	Replace all LED bars, bus 100% compatible 55lb/55lf line	55lb5600, 55lb6200, 55lb6500, 55lf5600	Maike SR
LG	21FU6TL	Turns on and off then arming protection, if you release the q16 the tv turns on normally, but with the vertical closed	R311=30k open	Replace it with another and run to another	Antonio Carlos (Eletrônica Renascer)
LG	CM9730	No audio	Turns on works normally cd, radio, bluetooth and usb. when you increase the volume no audio comes out on the 4 outputs, measure the voltage that feeds the pre-amplifier and mosfet -40v +40v it is giving 4.6v this is low, I removed the 18mn60n mosfet to see tsound is a leak they are all good, the defect was a short in some components: pc902-el817 is shorted, q956-ktc3203y is leaking, zd903-code smd y5w 16v shorted, on pin q956 to two resistors r973 and r998 - 22r open smd, on the same track as the bad c932-22uf 50v resistor, replace it, zd904- 16v smd code y5w with leakage, remove it from the board and test, ic902 - ice1h01-1 with leakage, I replaced these components and the horn appeared -40 +40 and audio normalized	Defect resolved	Andre
LG	CM9730	Standby LED doesn't turn on, press the power button and the remote control doesn't turn on	This defect is not a power supply, nor the main board, they are touch switches with a problem, I replaced them all, and not just the switches, near the bu2090f around the LED set, some are shorted on the other side, I also replaced all the LEDs with leaks and shorts, I turned on the sound worked	Defect resolved	Carlos
LG	CM9730	No audio on all 4 outputs	Measure the voltage on the power supply board +40v and -40v, it is giving 0v, I removed the mosfets, all 4 are leaking 18mn60n, I replaced them with the original, solved, audio normalized, 4 outputs worked	Defect resolved	Andre
LG	CM9730	Turns on in seconds turns off	Photocoupler el817 3 with leakage, 1 shorted and pc902 on the pin of this photocoupler to q956 - ktc3203y with leakage, on the pin of this transistor the zener diode shorted zd903 - code y5w, and a 16v smd diode, I changed the sound, it turned on, it didn't turn off but	Defect resolved	Andre
LG	CM9730	Doesn't start	Test the power supply it's ok, the cause was a faulty touch switch, I replaced all 3 boards and it wasn't just the touch switches either, near the bu2090f the LED was short, I tested it on both sides I replaced them all	Defect resolved	Andre
LG	21FU4RL	Plate or cushion defect	R 451 15k		AIRTON
LG	42LP560M 60LN549E 55LN549E 55LN541C 47LN549E 47LN541C 42LN549E 42LN541C 39LN549E 32LP560M 32LN549E 32LN541C	The TV restarts repeatedly after it has been running for a while	Poor contact between the power supply and the mainboard. The drop of 3.5v_st is detected by the unstable contact of the connector. replace the psu cable (connector) and socket, (apply glue to the connector and socket.		Anderson
LG	32LF57 49LF51 49LH57 49UF64 49UH60	Blue screen with spots	This problem is caused by the elimination of the silicon deled pkg replacing the led strips		Anderson
LG PLASMA	50PB560B	Turns on the sound and normal image after a few minutes the screen turns off leaving only the audio	Faulty controller board	After changing it, it returned to normal.	Eugenio
LG	29FU6TL	Image with cup effect	R318 was replaced, 3k9 resistor open.		José delta line
LG	26LG30R	When turning on, audio gaps appear, you have to turn it off and on again.	1.2 volt regulator heating up and creating resistance to the electrolytic capacitor on the back of the regulator, just change it and be happy.		Adriano oliveira
LG	32LH570B	Doesn't start	Positive short circuit with negative, because capacitor c2305 is short circuited. on the main board.	Removal or replacement of capacitor c2305	Carlos Alberto (ELETRONICA BATURITE)
LG	CM4340	No sound, s-protect appeared	Ic 931 12v regulator, giving 7v	12v 78r12 regulator replacement - ic931	VICTORINO
LG	42PJ350	Relay does not turn on	Join junper 73 with 53		Ílis
LG	43LJ5550	Standby light comes on when you press the power button on the control stanby LED flashes 4 times	The power outputs were checked and they were at 7 volts varying	The power supply board was replaced as it could not find a ci smd sc2016 position u601.	Adriano Miranda
LG	32CS460	Tunes quickly and doesn't memorize anything	With correct nutrition on the varicap.	The varicap.(tunner).celetronic was replaced.	This email address is being protected from spambots. You need JavaScript enabled to view it.