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JVC TV model AV32950 just clicks once, after storm

Discussion in 'Electronic Repair' started by Lenny, Jun 5, 2004.

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  1. Lenny

    Lenny Guest

    This set clicks once when first plugged in and after that does
    nothing. Are there any known failures with this model which might be
    precipitated by a storm? There is no apparent short in the HOT circuit
    or power supply and no other obvious problems. I have no schematic for
    this set and am not really familiar with this chassis at all. Thanks
    very much. Lenny Stein, Barlen Electronics.
  2. john

    john Guest

    Change the 1000mfd filter next to diode in SMPS
  3. Jason D.

    Jason D. Guest

    JVC behaves queerly on surge, it can take out anywhere because the
    parts JVC likes to use is bit delicate than usual. I had a recent JVC
    chassis surge take IF IC out which is very deep in the circuit while
    leaving rest of surrounding parts intact except for few blown zero ohm
    SMD resistors. (easy to see with magnifer looking for tiny pit.) I
    usually see this in inputs circuits and sometimes in the chassis using
    as jumpers. Even I had a JVC once that had bad A/V selector output on
    the micro. :)

    For yours:

    After change 1000uF cap still no go but power supply tries to start
    and shoot bit high while watching meter connected to the outputs while
    plugging in.

    If suspecting surge damage and either power supply is trying to start
    but shutting down, change all three digital switch transistors with
    DTC124EKA-X (only few cents each, SMD), Q944, Q927 and Q928 FIRST
    before trying to make sense of thoubleshooting. This three digital
    switches is responsible for wasted hours of searching because they
    checks out with meter because of resistors built into them.

    After that, finding rest of broken bits is gravy.


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