I have an LG 42" 42PX4DV Plasma, keeps resetting itself.

Hi there
Try doing a system reset on the TV, by unplugging everything from it, then wait 3 minutes and plug the power lead in only. If it works, then plug everything back in one by one. If the problem persists it may be that the software has been corrupted in an update process, which can be performed at night via the aerial signal (this may be why it was turning on at night). In which case contact the TV manufacturer.
Hope this helps
TV_Doctor

Hello,

Your power supply board is dead, u know basic electronics’ and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
hope this helps...

Basically when it turn itself OFF automatically all the time, the TV goes into "Protection Mode". This happens when there is a damaged circuit board inside the need to be replace and turn itself OFF to protect the other ones from being damaged.

A TV service tech will have to look at it to find out which boards need to be replace. There are about 7 different boards in your TV that would cause this problem.

Sounds like it started "Protection Mode" because of a failed electronic part inside the TV. When this happens, the TV will keep turning itself OFF or will not turn ON at all. This keeps the other parts inside from being damaged. Most likely the TV has a power supply related problem. The common part to go bad for flat panel screens circuit board that powers the screen itself. Most manufactures call it a Backlight Inverter Board.
But, I can't say what is 100% the problem because I can't actually look at the tv over the internet. I can only make guesses with the symptom.

You have a few choices:
1. Best thing to do, if you can find and purchase a Service Manual over the internet; It will help you diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you circuit diagrams, schematics, test points, and part# lists.Usually, cost under $20. Its the best repair guide material for fixing TVs. And most cases the new part cost less than $15 by searching on the internet with the part number.
2. Pay a TV shop to do the repairs. It maybe costly, but get an estimate of how much they will charge. That way you can decide if it worth repairing or replacing the whole TV.

I hope I shed some light on the subject for you.

i know this sounds silly but lick the battery. save your numbers to the sim card and reset your phone.. you have to keep reseting your phone.. this will work for about 2 days with no problems but if you keep doing it you won thave to worry bout it thanks

I am having the same problem, is there any solution for this problem?

YES YOU HAVE DRY JOINTS UNPLUG FROM POWER SUPPLY REMOVE THE BACK/ INSIDE YOU SHOULD SEE AT THE BOTTOM SEVERAL RIBENED CONECTORS FROM THE SCREEN ITSELF? UNDERNEATH YOU SHOULD BE ABLE TO SEE 2 OR 4 COMPONENTS CAREFULLY APPLY A HOT SOLDERING IRON AN SOLDER THE ONE THAT YOU ARE HAVEING PROBLEMS YOU SHOULD NOW HAVE FULL PICKTURE AGAINE ANY PROBS email me [email protected]

This unit has a common problem with fans. If one of the cooling fans is intermittent the unit will turn off when the fan fails. A qualified tech with a service remote can get into the service menu and on this unit the is a menu line that shows pwr down failures.