Question about LG 42LC2D 42 in. LCD HDTV

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42 in LG LCD TV turns off by itself

After turning on my LG 42 in LCD tv the unit turns off inr 7-9 seconds! no sleeper set no auto off

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  • krinpit Feb 17, 2008

    Same problem here. I rang LG and they said that it will have to go for a service. How did you resolve your problem?

  • LGturned off Mar 18, 2008

    sleeper set has never been turned on...rechecked it just in case...checked the plug in all its connections...the tv just turned off and wont turn back on...computer and dvd is running from the same outlet... help

  • bertphil Mar 18, 2008

    We have also an LG TV 21 inches, just this morning our turned on the TV it just secons it turned off itself. So tried to check the outlet but has no problem, I tried to plug in the TV and it light a second then turned off. What is the prolem? please we need help.

  • Anonymous Jul 22, 2008

    Same problem with ours. I am curious what you had to do to fix it and how much did it cost. It appears to be a widespread issue from reviewing other sites.

  • Tracelini Jul 22, 2008

    We have the same problem with our LG 50" Plasma. Turns off within seconds of turning on. Thought it might be wrong cable connector, but can't seem to figure out. Any thoughts? We're calling for service.

  • Anonymous Jul 25, 2008

    I have the same problem with my LG LC37D. It just started this week but does not happen every time, I was able to watch TV for 2 hrs yesterday, but I am worried to watch anymore, I don't want to ruin it for good.

  • smcreynolds Aug 25, 2008

    My flat screen has a problem . It goes blank and no sound a pictures comes back on in a few seconds goes back off and has a ghost on the left side of the screen goes off again and in a few seconds the picture comes back on again. It does this a few times then the screen goes blank.

  • a415guy Sep 11, 2008

    We just hooked up Verizon Fios Hi Def this morning (9-10-08) to our 1 week old 42" LG 1080p. The off and on problem did not start until the HD cable and all the channels tuned in.. Now, it cuts off and on for the first 3-5 minutes. After a few minutes the problem goes away. Its like something has to get warmed up or the HD is searching for a channel.

  • Anonymous Sep 12, 2008

    I have the same problem with my LG 42" LCD anyone found a solution???

  • Anonymous Sep 14, 2008

    same deal, mine turns on and off, called lg, they said to get it serviced... its brand new!

  • Anonymous Dec 15, 2008

    turn on off on off then went off never come back on













  • mikolajczykg
    mikolajczykg Feb 27, 2013

    vacuum the dust out of it.

  • mikolajczykg
    mikolajczykg Feb 27, 2013

    Take off the back panel and vacuum the dust out. Mine has not had a problem since I did this.

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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

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How do you do a master reset

Posted on Jan 05, 2010

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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

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Try doing a master rest on the TV, should help the problem. GS

Posted on Nov 07, 2009

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Change the power cord. had the same problem with my 50" LG. switched power cords and problem solved!

Posted on Jul 01, 2009

  • Licktee May 05, 2011

    My 50" LG plasma was Turing itself off after about 5 seconds but would turn back on when I tried. I replaced the power cord after reading this post and it was fixed immediately! Thanks $1000 worth!

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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

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  • Johan Richards Sep 29, 2013

    Wonderful info. The best, it works!!!!

  • Johan Richards Sep 29, 2013

    You champion!!!

  • Sctanley Harris Oct 21, 2013

    glad to be of service

  • Sctanley Harris Oct 21, 2013

    if it happens again just repeat the procedure

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What the hell it was. same problem for me.. i brought before 4 days only.. I made a mistake by buying this LG TV.

Posted on May 02, 2010

  • Pat Short
    Pat Short Jul 07, 2014

    powe supply

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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

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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

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Check your power board

Posted on Sep 03, 2015

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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

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This is madness!! Try getting a Mirror TV

Posted on Oct 06, 2011

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

My LG 50 turns on all the time by itself.

Posted on Aug 21, 2008

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  • 9895445163 Aug 31, 2011

    my lg 32 inc ld460 model also has the problem of of turning off by itself,sometimes it will automatically turns on back,but after few minutes it goes off,,i have tried of changinging the electricity wall plug,inputs such as laptop etc
    and i tried a factory reset ,,but no use at all
    the lg service guys are not responding ,,i have called them more than 1 20 times...
    anybody please help me................
    any method for master reset?????????????????

  • ggood82
    ggood82 Mar 13, 2013

    Hi all , My 55inch Led Lg is also turning off after 20 minutes or so and resetting itself ... After trying all sorts of things i have now realised it is the internet connection that is causing it to turn off . I unplugged the cat 5 connection as it was wired and the tv stayed on as normal . I tried to also use WIFI and when i did the TV switched off after 20 mins . I have now put the wrong password in WIFI settings to ensure it doesnt connect online and the tv has run perfectly for 2 weeks . We also swapped the TV over to a new one and this was still the cause when we plugged the internet in

  • Ice6250@gmail.com May 10, 2016

    I just bought mine from Craigslist. Go figure I'm having an issue. Lol. Anyway, it's turning off and on. I read that it may be a relay. I hear the"click" noise when it happens. And that was mentioned as a symptom to the relay being the problem. It's inconsistent. 10 minutes straight, then 3 times back to back and then nothing. Then out of the blue again. How plausible is it that it may be the relay? if so, how do I go about fixing it (I'm pretty mechanically inclined), cost, good place to buy parts, etc. Thanks. Pat from New Jersey

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2. Unplug any connected devices (DVD, Set-top boxes, etc...)
3. Press and hold the LCD TV power button for five seconds.
4. Plug the LCD TV power cord back into the power outlet and turn on the TV.
5. Open the on-screen menu to confirm that the LCD TV is responding again.
6. Turn off the LCD TV and reconnect the devices.
7. Turn on the LCD TV.

Hope it may help you;

Regards;
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