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I have a 42" Panasonic plasma model TH 42PA50A. It continually turns itself off after 20 minutes. I have had the power supply replaced, however the fault continued. The repairers could not replicate the fault in the workshop and sent it back faulty even though they had seen it fail in my home. The power to the house is good. I have tried different cables and power points.

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  • mikeinoz Aug 24, 2008

    Additional information, the LED on the front blinks 4 times.

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If it's a plasma, and not a rear-projection TV... try situating a floor-standing fan behind the TV, blowing over the back casing. (as hard and close as possible)

If it lasts longer, or doesn't fail at all, you know you have a problem with (probably) a transistor or two (or more!)

Bigger heatsinks or replacing the transistor(s) with higher heat-rated units can be the fix for that. (cheapest option first, but best option is to replace faulty transistors)

Posted on Aug 24, 2008

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Did you check the inverter in your tv .........

Posted on Aug 24, 2008

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IF YOU HAVE TO UNPLUG THE T.V. TO GET IT TO RESTART, IT IS PROBABLY HIGH VOLTAGE SHUT DOWN. IT CAN BE THE FLYBACK TRANSFORMER OR POSSIBLE BE A SHORTED CRT.
DOES THE SET HAVE HIGH USAGE ON IT ? WAS IT A FLOOR MODLE ? IS IT WATCHED MORE THAN 4-6 HOURS A DAY ? YOU CAN DROP THE CRT BOARDS AND SEE IF IT STAYS ON. OR REMOVE THE HIGH VOLTAGE (RED ) LEADS OUT OF THE HIGH VOLTAGE BLOCK. MAKE SHURE YOU DON'T REMOVE THE ONE GOING INTO THE BLOCK. ONLY GOING OUT. ALSO CHECK FOR COOLANT LEAK ON THE BOARD. IF THE STK'S ARE ON A SEPRATE BOARD YOU CAN UNPLUG THE CONVERGENCE BOARD AND SEE IF IT STAYS ON.


Posted on Aug 24, 2008

  • Legin Varghese
    Legin Varghese Aug 24, 2008

    irst of all, you should try making sure in your menu that you do NOT
    have your timer set to shut off. You'd be surprised how many people
    call Zenith every single day and fuss at me because their tv is
    'broken' and they have a timer set. Secondly, it sounds to me like it
    could be an issue with your power supply. Does it turn itself back on
    randomly as well? Do you hear any popping sounds when it turns off?
    Check with your manufacturer to see what their repair warranty is.

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