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Convergence Problems

Discussion in 'Electronic Repair' started by CP, Oct 14, 2003.

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  1. CP

    CP Guest

    I have a Toshiba 50-inch rear-projection TV that's about 5 years old.
    It tends to get wavy after 20 minutes or so of viewing, with the three
    color lines going wacky and the screen shifting up. If I (ahem) knock
    the back of the TV, it will be fixed---sometimes. But it's only
    gotten worse over the past three months, and even a solid whack
    doesn't fix the problem. Any ideas?
  2. David

    David Guest

    A connection problem somewhere in the tv set. Without actually seeing it in
    action, no way to even narrow down where to start looking.

    Odds are very high that if you keep running it like this, you will probably
    have an more expensive failure to have repaired.

  3. James Sweet

    James Sweet Guest

    It's got a cracked solder joint somewhere, stop using it immediatly until
    you get it looked at, a bad connection can blow up all sorts of expensive
    parts, and in this case it's something in the deflection circuitry, and if
    that fails it can destroy all three picture tubes in less than a second,
    which generally turns the set into scrap.
  4. I am curious how a bad solder connection in a convergence circuit will blow
    up "all sorts of expensive parts". No doubt you could end up with a bad
    output IC and a blown fuse and resistor or several. Might have a bad output
    IC anyway right now. I have, however, never run into extensive damage of
    the sort that you describe that started with a convergence problem. Now if
    there is any hint of deflection failure, certainly burned crts are a
    potential problem, but lets not exaggerate the potential in erroneus ways.

    Getting the set fixed by an experienced tech sooner rather than later is
    good advice. Let's just keep the advice credible.

    Leonard Caillouet
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