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dead psu

Discussion in 'Electronic Repair' started by yhan, Aug 6, 2005.

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  1. yhan

    yhan Guest


    can anyone direct me where to troubleshoot a dead atx psu. a green wire
    was already shorted to ground (black) but nothing happens.

    i read from the net that almost all concepts of AT and ATX psu are
    the same.

    The differences are: that ATX PSU always has +5V standby (what color of
    a wire is the sb?), it powers up through logic circuit (maybe through
    ic w/c is in the psu itself) and that it can be controlled by software.

    i already have repaired AT psu many times but i do not try ATX yet.

    thanks in advance,

  2. DaveM

    DaveM Guest

    Dave M
    MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
    the address)

    Never take a laxative and a sleeping pill at the same time!!
  3. crazy frog

    crazy frog Guest

    i have repaird 2 atx so far.
    i found i one of them the small
    electro cap for the 5v sb leaky.
    the other one i put new electro caps
    onthe output side, thay were leaky
    and bubbeld up.
    so you have the 5vsb supply
    then check the main swtching transistors
    and the small electro caps around them
    and the resistors as well, if all ok
    check all the output electro caps.
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