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HV shutdown

Discussion in 'Electronic Repair' started by BigTom, Dec 22, 2004.

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  1. BigTom

    BigTom Guest

    Mitac L1450PD monitor

    i get HV for about half a second then it shuts down.
    heater glows orange 6v at crt neck.
    G1 and G2 drop to 0v after shutdown.
    HOT ok.
    removed HOT and placed a 240v 40w globe across collector and gnd.
    lamp lights up.
    i measured B+ at one of the caps on the secondary side of the chopper
    and get 152v.
    is this a good place for B+ and is this voltage too high?
  2. Jerry G.

    Jerry G. Guest

    The symptom you are describing is usually attributed to a bad flyback
    in your model of monitor. The drive transistor should be changed along
    with it when this is the case.

    Jerry G.
  3. BigTom

    BigTom Guest

    i replaced the flyback and drive transistor with one out of another
    monitor(same part No).
    still the same. could be bad as well.
    measured the B+ at flyback and found 152v.
    it looks like this voltage is from the power supply.
    ive read somewhere that B+ should be around 120-130v.
    is this right?
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