Question about LG 42PG20 42 in. Plasma HDTV

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42 LG plasma no picture but sound. found internal fuse had gone so replaced. Then when switched on it stays on for about 5 seconds and switches itself off again. Replaced power supply and now when switched on it tries to come on then clicks and goes back to standby and red light is on. any Ideas

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  • Anonymous Mar 14, 2014

    have a samsung ps42b430p2w plasma tv.when i try to switch it on it just continously clicks.what board are the 2200uf 16v 105 c capacitors on.not sure which board the power supply board is

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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.

Posted on Jul 21, 2009

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