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Norcent 42" Plasma TV

Discussion in 'Electronic Repair' started by Chris F., Apr 28, 2010.

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  1. Chris F.

    Chris F. Guest

    Someone recently brought in a Norcent PT4235 plasma TV. It had apparently
    "just quit". When I plug it in, the relays click a couple of times like it's
    trying to start, and a bit of static flashes on the screen, but that's it.
    I looked under the back cover and didn't see any bulged or leaking caps,
    nor did I find any obvious shorts in the many high-wattage transistors.
    Before I go any further with this, I'd like to know if there are any known
    issues that someone could point me to. This set has a massive number of
    power supplies in it, and I really don't want to waste several hours on
    something that may not be fixable in the first place. This is a very cheap
    brand of set (retailed for just $700 new), so I doubt it's worth spending
    much time on.
    Thanks for any advice.
     
  2. It's a slim shot, but you might try (when powered down) measuring resistance
    from the output side of all voltage regulators and rectifiers looking for a
    short to ground. (Often the rectifiers are TO-220 packages).
    Saved my ass once recently. A Samsung plasma with power supply issues - and
    the board no longer available from Samsung. Robbed a TO-220 rectifier of the
    same type off a scrap board.

    Mark Z.
     
  3. Guest

    A common cause of this problem is a shorted sustain card. This
    appears to use an LG panel. One troubleshooting method on these
    panels is to unplug the TV, disconnect the cable linking the power
    supply to a sustain card, then plug the TV in again and see if the
    power supply turns on. If that didn't help,disconnect the next
    sustain card.

    PlainBill
     
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