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Compaq series PDP-124P PSU - dies after a split second

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    #1

    Compaq series PDP-124P PSU - dies after a split second

    Hi

    I am quite baffled at this PSU that came out from an dead HP d530 (asus P4SD). Tested all the common failed components, all are fine. D2/3 are both fine. Not shorted in any way. Recapped the whole 5VSB board and the PSU came "back" from the dead (earlier there was a short from neutral to earth, went away disassembly). Now even with 5 load HDD's it's still turning off after a split second. All diodes seem to be fine. Caps are OST, which IMO rarely die. There is 3.3v on PS_ON and 5V on 5VSB. Removed most of the glue there was (pictures don't show it). The traces that look like they are burnt, are infact, not burnt.
    Anybody can help me troubleshoot?
    3 Photos
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    #2
    How does the PSU behave under a lesser/no load? 5 HDDs seems like a lot of start-up load for a PSU with a rather low 12v current rating (unless you're talking about 2.5in HDDs, not 3.5in).

    While yes, from my own experience too, do OST caps seem to hold up better than most other Taiwanese/Chinese capacitors, I've also seen that they do not like heat, and will fail if placed near heatsinks or in areas with low air flow.
    I'm not a expert, I'm just doing my best.

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      #3
      Same behavior with no load. Any ideas?

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        #4
        The PSU started to trip fire breakers, again. This time it went away witha bright spark from the 230v connector. I am very skeptical of it now. Not sure I wanna go ahead and screw around anymore.

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