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Still "Toshiba problems"?

Discussion in 'Electronic Repair' started by Forrest, Jan 18, 2008.

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  1. Forrest

    Forrest Guest

    I posted a couple of weeks ago about my Toshiba 32 in. TV. Below is a snip
    of it.

    "I have a 32 inch Toshiba TV (CX32D60) vintage 1994. It developed a problem
    with the vertical aspect of the picture. It started after a local power
    failure. I, in my infinite wisdom, ran an extension cord out to the car and
    plugged it into a small inverter. Anywhooo ... now, when turned on, the
    lower six inches or so stays black until warmed up and then about the bottom
    few inches stays black. People on the screen look like cone head midgets."

    I tore the back off of it and blew out all of the dust and crud and have
    been looking around for anything that looks leaky or swollen etc and can
    find nothing. I guess I'm supposed to be looking for the "Vertical IC
    section" change out the caps and possibly the IC chip, or whatever it's
    called. The only problem is, I don't see anything labeled to indicate that
    it's that section. On the board are printed words such as : Power, Horiz,
    V/C/D, A/V SW and Selector etc. I haven't removed the board yet. Actually
    it's two boards butted up against each other, side to side. The one on the
    left, viewing from the back, is labeled PB 4346-1 and the board on the right
    is labeled PB 4347-1. I see about a half dozen heat sinks, spread around. I
    suppose the Vertical IC is attached to one of them? Obviously I'm lost.
    Again, any help or advice would be greatly appreciated. Thanks
     
  2. JANA

    JANA Guest

    I would seriously consider bringing the TV to a service centre who knows
    what they are doing. This way the set will get safely serviced.

    --

    JANA
    _____


    I posted a couple of weeks ago about my Toshiba 32 in. TV. Below is a snip
    of it.

    "I have a 32 inch Toshiba TV (CX32D60) vintage 1994. It developed a problem
    with the vertical aspect of the picture. It started after a local power
    failure. I, in my infinite wisdom, ran an extension cord out to the car and
    plugged it into a small inverter. Anywhooo ... now, when turned on, the
    lower six inches or so stays black until warmed up and then about the bottom
    few inches stays black. People on the screen look like cone head midgets."

    I tore the back off of it and blew out all of the dust and crud and have
    been looking around for anything that looks leaky or swollen etc and can
    find nothing. I guess I'm supposed to be looking for the "Vertical IC
    section" change out the caps and possibly the IC chip, or whatever it's
    called. The only problem is, I don't see anything labeled to indicate that
    it's that section. On the board are printed words such as : Power, Horiz,
    V/C/D, A/V SW and Selector etc. I haven't removed the board yet. Actually
    it's two boards butted up against each other, side to side. The one on the
    left, viewing from the back, is labeled PB 4346-1 and the board on the right
    is labeled PB 4347-1. I see about a half dozen heat sinks, spread around. I
    suppose the Vertical IC is attached to one of them? Obviously I'm lost.
    Again, any help or advice would be greatly appreciated. Thanks
     
  3. Guest

  4. Well, you sound like you are in over your head. If you plan to try to
    service this yourself you might do some reading on the S.E.R. F.A.Q.
    http://www.repairfaq.org/ It will help you figure out your way inside a TV.
    Be sure to also read the section on HV power supplies. TVs can be dangerous
    if you don't know what your doing, or even if you do know what you are doing
    and just aren't careful.
    Good Luck,
    Mike
     
  5. This is spam from a data-recovery site. I also received spam from them about
    the Sharp microwave.
     
  6. Ron(UK)

    Ron(UK) Guest

    Me too, several of them, all bearing either the name of this group or
    threads to which I`ve replied

    Ron(UK)
     
  7. clifto

    clifto Guest

    Yeah, I got that one by e-mail.
     
  8. Meat Plow

    Meat Plow Guest

    Sounds as if you've been reading his group but I'm not certain you're up
    to the task. My 'guess' is you damaged the power supply and not the
    vertical. And you may have not really damaged it so to speak but rather
    caused a problem lurking in the background to show its ugly face.

    Proper diagnostics would include but not necessarily be limited to service
    literature, a decent voltmeter (preferably a DVM) and a suitable scope.
    Those things couple with a decent knowledge of trouble shooting techniques
    are what I consider minimum requirements. You might want to Google for
    some basic principles of tv trouble shooting and safety precautions to get
    started.
     
  9. Forrest

    Forrest Guest

    I removed the circuit board and found an area marked "VERT" which I assume
    is the vertical section. I was about to replace the caps in that area but am
    now wondering if it's worth the trouble. Why do you think the power supply
    is bad? The set turns on fine and the sound is great. The only problem is
    the squatty cone head look and the three inch black bar across the bottom.
     
  10. James Sweet

    James Sweet Guest

    The power supply is probably just fine. This sounds like a classic case of
    bad capacitors in the vertical circuit.
     
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