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TV standby PS voltages too high

Discussion in 'Electronic Repair' started by Peter Orban, Oct 4, 2005.

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  1. Peter Orban

    Peter Orban Guest

    Hi Everyone,

    It is a Toshiba CX2168C, #8806. The standby PS is an unregulated flyback
    circuit using an STRD-1005T chip, followed by a zener at one output, and
    with a linear regulator on the 5V. The unregulated voltages from the
    SMPS to the linear stages are about twice what they should be.
    The only thing I can think of are shorted turns in the primary of the
    flyback transformer, changing the turns ratio and thus the output voltages.
    Any comment or advice?

    Thanks, Peter
  2. Andy

    Andy Guest

    are you using a scope, Digital or Analogue Meter?. There can be a difference
    due to the waveform. I am not sure what to expect at flyback frequencies. I
    am only happy when I get the same voltages as on the circuit diagram
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