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36" Panasonic dead.

Discussion in 'Electronic Repair' started by Dani, Dec 23, 2006.

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  1. Dani

    Dani Guest

    CT-36HX40CB dead, horizontal output shorted, nothing else bad, replaced
    it, now it starts up, but only momentarily, but shuts right down. All
    B+ voltages come up, but go right back down. I got the service manual
    from the Panasonic site, but there's no schematic. Has anyone repaired
    one of these for this fault? Thanks, Dani.
     
  2. dennis

    dennis Guest

    I'm not familiar with this chassis, but it is probably a bad B+ regulator.
    Usually in the neighborhood of 120-160vdc. May be an STK series IC.
    This is a common failure mode. B+ voltages look good at startup, but rises
    above regulated level and unit shuts down. You don't have time to see the
    overvoltage before shutdown. I never figured out if the output transistor
    shorting overloads the regulator or the regulator failing destroys the
    output transistor, but it happens a lot.
     
  3. David Naylor

    David Naylor Guest

    Comon problem with this chaxic...replace the fly back
     
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