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pumping noise from PSU in TV

Discussion in 'Electronic Repair' started by Aries Quitex, Nov 9, 2003.

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  1. Aries Quitex

    Aries Quitex Guest


    I always thought I'm a professional R&TV-Technician, but I'm slowly running
    out of ideas:
    I have here a Provision 14" TV portable, Type "ST-1410T PAL BG Black".
    The only ID I'm able to find on the PCB is a codelabel on both rear case and
    tuner, reading 938842.82832
    I checked the horizontal and vertical driver stages, all OK, the CRT PCB is
    also intact, but still the PSU generates a chirping noise, about 4 chirps
    per second. When switching the set off the LED shows for a half second to
    be pulsing in the sequence of the chirping.

    Any Ideas, recommendations?
  2. James Sweet

    James Sweet Guest

    Something's still shorted, have you checked all the diodes and capacitors in
    the output section of the power supply? You could also remove the rectifier
    diodes one at a time to disable that output, that'll narrow down which one
    is overloaded.
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