42LG30R TV Repair: Common Faults and Solutions.

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42LG30R Repair Guide: Common Issues and Fixes

Repair tips, common issues and fixes.
Brand	Model	Fault	Detailed Problem	Solution	By
LG	42LG30R	Red LED turns off as if it was going to turn on and it doesn't turn on, power supply voltages are absent	Shorted transistors on the inverter, the fuse did not open, causing the 24v power supply to trip		davi.sls
LG	42LG30R	Turning off or not turning on intermittently.	Filter capacitor c620	Replace capacitor c620 150/450v	Valdenir tecvideo
LG	42LG30R	Red image, menus with ok colors	Rewrite the ic802 eeprom		Resistronic Resende
LG	42LG30R	Green or whitish image	Corrupted software ic802	Rewrite software from ic802 memory atmel 24c64 1.8v	GABSENS
LG	42LG30R 32LG30R	Turns off by itself, sometimes it doesn't turn on, sometimes it gets a greenish screen, it makes noise from the speaker and turns off.	It may be caused by several possible problems, carry out the following procedure to resolve and avoid a possible return.	Check the power supply and inverter board for swollen capacitors and replace them. Remove the power supply components: c108, zd111 and zd112. Also at the power supply, replace the 11k resistor r128 with a 15k or 18k one. On the main board, replace the SMD electrolytic capacitors that are close to the processor and RAM memory with values of 100μFx16v and 10μFx16v. Clean the main board well on both sides with thinner or isopropyl. resolder all fets, transformers and heatsinks on the power supply	GABSENS
LG	42LG30R	Turns off by itself, sometimes it doesn't turn on, sometimes it gets a greenish screen, it makes noise from the speaker and turns off.	It may be caused by several possible problems, carry out the following procedure to resolve and avoid a possible return.	Check the power supply and inverter board for swollen capacitors and replace them. Remove the power supply components: c108, zd111 and zd112. Also at the power supply, replace the 11k resistor r128 with a 15k or 18k one. On the main board, replace the SMD electrolytic capacitors that are close to the processor and RAM memory with values of 100μFx16v and 10μFx16v	GABSENS
LG	42LG30R	The standby flashes 2x, then just the blue LED and it doesn't turn on	Defect in the inverter, I replaced it, it solved it, you can disconnect the inverter and the sound comes out, just to test		Lucasvisita
LG	42LG30R	Turns on after 40 minutes in hot weather, it turns off, only when it cools down it works ok, diode d1103 is weak. Change caps c875, c879, c1110, c1118, c1128.8	By quickly disconnecting the capacitors, the diode took a while to turn off only in hot weather.		guinga sdia goias
LG	42LG30R	Hdmi, av., component inputs do not work.	Removed from the eeprom-flash (ic 802 or ic 803, I don't remember) and saved the .bin file (memory type 25co) of the relevant model. The detail is that you have to check if all the inputs are working. If not, it's the processor or Corrupted memory. After recording and resoldering, the inputs started working again.		JOSE CARLOS
LG	42LG30R ?	Turns on and within a few minutes turns off or locks the keyboard.	C 875 and c879 on the main board of 10 micro by 16 volts	Swap c875 and c879 on the main board.	This email address is being protected from spambots. You need JavaScript enabled to view it.
LG	42LG30R	Standby passes to blue and does not turn on. without 24, 12 and 16v	Rl-101 with open bonnet.		XANDARE
LG	42LG30R	Completely stopped	Fuse open, q110 and q111 shorted, r140, r119, r120 open and zener zd115 (7v5) leaking	<a href="https://www.electronica-pt.com/forum-eletronica/avarias-resolvidas-dicas/97265-tv-lg-42lg30r-totalmente-parada#126282" target="_blank"> see more. ..</a>	Strutz
LG	42LG30R	TV turns on and off	2 capacitors 10/16v on the main board c879 and c875	Replacing capacitor c879 and c875	Marcio
LG	42LG30R LP81A	Strange letters and characters in the TV's menu and OSD, and HDMI inputs with no image.	Corrupted memory.	Rewriting of memory at24c64, position ic802.	rafaelmoraes99
LG	42LG30R	TV would turn on after a few minutes on HDMI 2 it would turn off and on 1 it would have no sound but with image but controls no longer worked	Different capacitors change without testing, c1110, c1118 and c1128	Replace capacitors on the main board, replace without testing, c1110, c1118 and c1128 with electrolytics or if you have the same ones	ES informatica e eletronica
LG	42LG30R	Turning off by itself, sometimes the sound fails, disconnecting the speakers, it stops turning off.	Replace without testing, c1110, c1118 and c1128		Miratec Eletrônica
LG	42LG30R	After changing the swollen capacitors, it still turns on sometimes	Replace r128 for 20k and r110 for 270k remove from board c108 zd 111 and zd112		HP ELETRONICA
LG	42LG30R	Doesn't start	Replace r128 11k for 20k if it doesn't work, replace r110 330k for 270k		jeferson
LG	42LG30R	Nothing or LED turns on	Q602 shorted, replace		Bruske
LG	42LG30R	When it turned off, it only turned back on after many hours	Replace the 11k r128 with an 18k one, as per Mr.'s tip. luiz melo. it was ok.		Francisco Rocha