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Older Toshiba 48" TV

Discussion in 'Electronic Repair' started by Michael L Kankiewicz, Jun 23, 2004.

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  1. Hello all. I have an older Toshiba 48" projection tv that is having a
    problem. All of a sudden, the picture will go concave on all four sides,
    and the colors distorted. (Lots of red and green shaky blur.)

    What's driving me nuts is that it's intermittent. The tv could run fine
    for 4 hours, then all of a sudden it hits. Then maybe two-five minutes
    later it snaps back to normal. Or when the problem hits I turn the set
    off for about 5 min and then back on and it's fine.

    The repair service I talked two said it might be a "convergance" problem,
    not expensive to repair, but they will only come out when it's happening,
    and it's unpredictable.

    Any advice? I got this tv for a song a few years ago, so I don't mind
    puting a few bucks into it if it buys me several more years with it.

    Thanks,
    MK
     
  2. Jerry G.

    Jerry G. Guest

    You should call another TV service shop. It would be best to call the
    authorized Toshiba service rep for this one. They would most likely have the
    parts on hand if the set is not too old, and they would probably know what
    the fault is for your model.

    --

    Jerry G.
    =====



    Hello all. I have an older Toshiba 48" projection tv that is having a
    problem. All of a sudden, the picture will go concave on all four sides,
    and the colors distorted. (Lots of red and green shaky blur.)

    What's driving me nuts is that it's intermittent. The tv could run fine
    for 4 hours, then all of a sudden it hits. Then maybe two-five minutes
    later it snaps back to normal. Or when the problem hits I turn the set
    off for about 5 min and then back on and it's fine.

    The repair service I talked two said it might be a "convergance" problem,
    not expensive to repair, but they will only come out when it's happening,
    and it's unpredictable.

    Any advice? I got this tv for a song a few years ago, so I don't mind
    puting a few bucks into it if it buys me several more years with it.

    Thanks,
    MK
     
  3. Art

    Art Guest

    Probably the convegence circuit, the STK output devices, associated
    resistors, power supplies, etc. Generally about $250 to repair. Have a
    service tech come out and check it out, also have them eveluate the
    condition of the crts before going too far.
     
  4. Thanks to both of you. It was the local Toshiba authorized rep I called,
    and he was pretty sure about the problem, but but insisted they couldn't
    guarantee the fix if it's not happening when they show up. AND charge
    $50 just to be there for nothing. I *hate* intermittent problems :|

    Like my old Tandberg fm tuner that occasionally goes haywire tuning in
    to 93.5 when it's set at 88.7 for ten minutes, then is fine for a week.
    Arghhhhgh!!

    MK
     
  5. b

    b Guest

    If you can use a soldering iron, you could do worse than checking
    /resoldering connections in the relevant area on the main board. From
    what you say, it could be a dry joint.
    I had an old sony KV27EX with a similar problem, just needed to
    resolder connections on the picture geometry adjustment board (which I
    suspect also had a few flaky pots - cleaned those too)

    However, if on opening the set you decide it 's too difficult or you
    aren't sure how well you could do it , consult a tech. see
    www.repairfaq.org for safety advice and other tips before beginning.
    Good luck
    Ben
     
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