Question about LG RU-42PX11 42 in. EDTV-Ready Plasma Television

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No pic HELP!!! our tv comes on but no picture at all, power is on though what could this be ???

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Hi There,

Have you double checked that your scart leads are all pushed in fully, usually if a scart is out on one side you loose either picture and/or sound...

Posted on Feb 19, 2008

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Sanyo DP42849 no picture but has sound


Sounds like an inverter problem. On some of these sets, the inverter and the power supply are on the same board. These boards tend to be quite pricey, $100 + range. I've worked on your particular model with the same problem, and it was a bad inverter/power supply board. I would recommend you get a diagnosis to be sure.

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Hi Leanne.. since your TV was flickering to begin with, that problem still exist since cleaning it will not resolve it... as a rule, cleaning a TV by taking it apart will not solve any problems, only creat more..

Flickering of the picture us usually caused by weak signal reception and should be the first thing to check. Next check the power cord and receptacle and make sure neither are worn or damaged. Try moving the tv to another receptacle... if it still is not working correctly, probably time for a trip to the TV repair shop...

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My kid put a plug from the computer no power to it and it just went off it was pluged into the serivce port


It's probably just a fuse.
I don't have a physical layout of that TV inside though so if it's blown, I'd need pics.

Here's the possible good news though.
He may have simply tripped the power supplys' protection circuit.
Unplug the TV for 5 minutes and plug it back in, it may be fine!
It takes a while being unplugged to reset the power supply when that sort of thing happens.

If the TV still won't come on, you'll need to open it up and get some good shots on the power supply board and the board that the service port is on, and of the cable that connects the 2 of them together.
If the pictures are good enough, I can point out where the fuses are.

If the photos are necessary, post a comment or reply here and I'll give you an address to send the photos to.

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1 Answer

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Ur power board is dead,must replaced to get picture back.Turn on/off couple times,wait 10-20 mins see if pic come on.100% is the power board.Not than ur Signal tuner board could be the cause.

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if the tv has backlights it's probably the T-con board, if no backlights it's the power supply

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this looks like there is something wrong with the light engine or light engine driver board. does it get worse the longer you watch?

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I am Having the same problem as PScott. I will open my TV this weekend wil a friend who is a electrical technitian. We hope that ther is any schematics inside the TV though..

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