Question about LG 42PX5D 42 in. Plasma HDTV

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42" Plasma Cycles on/off when turning tv on

I try to turn the tv on and it cycles on and off continuously. The green power light in the front flashes twice, then red once. I tried to plug the tv directly into the wall outlet, but that did not work. It still cycles on/off when I unplug and plug in again. I was able to get a picture by trying to unplug the tv, but then it got worse and now it won't stay on.

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Most likely the TV has a power supply related problem. The most common thing to go out is the circuit board that supply power to the screen. Commonly called a Backlight Inverter Board.
I can't say it's 100% the problem because I can't actually look at the tv over the internet.
If by chance the TV is still under warranty, go that route.
If not under warranty and If you have some electronic experience, you can purchase a Service Manual over the internet and diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you circuit diagrams, test points, and part# lists. Usually, cost under $20.

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

Posted on Jun 29, 2009

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Plasma keeps flashing. What's my problem?

Posted on Feb 01, 2010

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Posted on Jan 02, 2017

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