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JVC 42X776 Plasma Screen partially broken

My wife brought home this tv from work because they were just going to throw it out... "Good Wife" I said. Anyway....

I turn it on and the bottom left quadrant remains black. Some lines start to appear and creep across the screen. There is also a black patch in the middle that has absolutely no pattern to it. The best way to describe it is "flower shaped" I can change inputs and access menus. It locked on my one time and I had to do a hard reset (aka pull the plug). So, I'm thinking it overheated at one point and fried something inside?

I'm going to take it apart and look for some smoked ICs. ANy other suggestions?

Thanks!!

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  • JPSBMW325I Oct 08, 2008

    What can I do about a defective panel?

  • JPSBMW325I Oct 09, 2008

    So further diagnosing the issue: The bottom half of the screen has massive red snow and some black. It is more concentrated in one area than the rest of the panel. I
    played with all the tunable pots and I could make the screen change,
    but nothing got better, although I did tune some of the black away, so now its all snow. After doing some research I found out that
    there are 2 boards, an upper and a lower that drive the corresponding
    halves of the screen. There is also a main board that builds the power
    I'm guessing and the upper and lower boards do the DSP. So, my
    question: The DSPs on the lower are getting extremely hot (all 4 of
    them) and the TV actually shuts off after a while (I'm guessing
    overheating). Does anyone know of a common failure on these boards?
    There are not any obvious blown caps or ICs....



    Thanks

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  • 41 Answers

Sounds like you have a damaged panel or at least defective one

Posted on Oct 08, 2008

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