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mitac L1450PD monitor black screen

Discussion in 'Electronic Repair' started by BigTom, Dec 13, 2004.

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  1. BigTom

    BigTom Guest

    green led on, fuse ok.
    the HOT(BU2508DF) was shorted but i cant find anything else.
    i usually find at least a leaky cap or shorted diode in
    the same area.
    is it normal for just the HOT to blow?
  2. Al Savage

    Al Savage Guest

    Back in the day, I used to see a lot of these.

    Q501 BU2508DF HOT
    C509 10uf 50v NP
    C508 100uf 16v
  3. BigTom

    BigTom Guest

    I removed capacitors C508 and C509. checked esr and also for shorts
    with a MM. they check out ok.
    I put a new HOT in and connected a 100w lamp across the fuse holder.
    Powered it up but the monitor stays in standby mode.
    100w lamp lit up bright then went out.
    Power cycling click click is there.
    Is the lamp stopping the power supply or do i still have a short
    in the HOT circuit?
    How can i test this without blowing up my new HOT?
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