Question about LG 42LC2D 42 in. LCD HDTV
After turning on my LG 42 in LCD tv the unit turns off inr 7-9 seconds! no sleeper set no auto off
Found that TV started switching off by itself. Would try to come on..green light blinked for 2-3 seconds, tv came on (with picture and sound) for 1 or 2 seconds and then it would turn itself off. Found that the issue is with one channel only. If you are facing this issue....try quickly changing the channel the moment it comes on. You can do it either with remote or with the TV buttons directly. also in the same logic, if this is still happening, try changing the source to another (rgb-pc, av1, av2 etc). Basically change it from whatever input it is on currently, if changing the channels does not work. My symptom was that the tv made a loud 'TIK' 'TAK' sound which is louder than normal.
Posted on Mar 17, 2010
How do you do a master reset
Posted on Jan 05, 2010
My 50 inch LG had this problem after a power outage. Called LG and tried the reset, but it did not work. What I did was turn on all the electronics attached to the tv, dvd player, satellite receiver, WII, Apple tv and then started hitting the input button which would take the tv from standby mode (red light) to on mode (green light) for about 2 seconds. As I flipped through the inputs finally the tv's green light stayed on as the tv was trying to reset and acquire the signal. When the green line came on I started using the remotes for the other electronics and then the tv acquired the signal from the satellite receiver and reset. Started working perfectly again.
Tony in Tennessee
Posted on Aug 30, 2009
Try doing a master rest on the TV, should help the problem. GS
Posted on Nov 07, 2009
Unplug everything then unscrew the back panel . Clean the dust off the mother board and wherever you see dust then unplug anything that can be unplugged then plug them back in. That should work for 9 to 12 months before you have to do it again. I bought my lg 42" in 09 and it started a year after and it took me 2 years to figure out the solution. Hope it works for you.
Posted on Apr 17, 2013
The wife & I have the 42" SMART TV, model # 42LN5700 & we had this problem for almost 6 months! Bought in Aug 2013; worked fine until Mar 2014; then every few days (or nites) it would do the shut down/start up thingie. It got progressively more common (sometimes several times a nite) at which point we were both ready to toss it out...the only solution seemed to be a good solid swat on the RHS back panel just above the plug in.
(I should mention we also have a 47" LG LED flat panel that we bought in Nov 2010, & it's worked flawlessly from day 1...never a problem)
After reading a few forums like this, & working my way thru YouTube, I removed the back panel using our bed as a "workbench". Simple things first; I made sure the power control panel (RHS) and the motherboard (LHS) -both as viewed from the front, btw- were tightly attached. Every screw need at least a FULL TURN!
My fix was simply tightening the screws that attach the plug-in unit on the power control panel, where the cord plugs into the TV. This receptacle mounts at a 90 degree angle, & was LOOSE & WOBBLING on the board. Since tightening it down, we've had no more problems. Just a bad connection...
Hope this works for someone else...apparently the units assembled in Mexico have some "loose screw" issues!
Posted on Dec 26, 2014
I had this problem before on my LG TV. My solution is to put a 12V fan on the tuner board processor powered by AC on the power board. The problem is caused by the TV overheating and the tuner CPU cuts out because it is hot and instructs the power board to shut the tuner board off (although the rest of the TV stays on). You cannot likely get a TV repair man to fix this because the LG TV's do not have adequate heat control other than vent holes on the bottom and top. This is a design flaw that started a class-action lawsuit against LG.
Posted on Dec 12, 2014
It was the board screws loose that seems to have fixed the issue for me.
Posted on Nov 15, 2018
Check your power board
Posted on Sep 03, 2015
Same Prob. LG 42" turning on and off. Took off back and tightened eight screws, 4 on each board, problem fixed!!!!
Posted on Jun 21, 2015
LG replaced our 50" plasma tv. repairman could not fix the problem. took a while, but we finally have a new tv. thank god for warranties!!!
Posted on Oct 13, 2008
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Posted on Jan 02, 2017
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