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Failure mode of Apple G4 MDD PSUs ?

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    Failure mode of Apple G4 MDD PSUs ?

    I've recently acquired a PowerMac G4 MDD which I had some trouble starting, and although I think the problem was actually to do with a RAM stick, in my research I found out that these are known to have PSU problems - so I think I want to look into that as well, even if just for fault prevention.


    My question is, what is the problem with the PSUs used in these? Just usual bad capacitors or something more?

    I've got an AcBel, API1PC36 Rev:B (see attached photo)
    Attached Files
    "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
    -David VanHorn

    #2
    Re: Failure mode of Apple G4 MDD PSUs ?

    The search tool is your friend....

    https://www.badcaps.net/forum/showthread.php?t=13985

    https://www.badcaps.net/forum/showthread.php?t=14077

    The AcBel's are usually just caps. A few small ones and the outputs.

    The Samsung's can be quite a bit more involved, but their output caps are generally sound. The mains cap, main switcher MOSFETs and the little caps are what gets you on these.
    Last edited by Toasty; 05-23-2011, 02:17 AM.
    veritas odium parit

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      #3
      Re: Failure mode of Apple G4 MDD PSUs ?

      Thanks, in fact i did find those after I posted

      However, they talk about totally dead PSUs... mine seems to be working OK - no startup problem since cleaning the RAM contacts anyway...


      I might open mine up and check the capacitors when I find time...
      "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
      -David VanHorn

      Comment


        #4
        Re: Failure mode of Apple G4 MDD PSUs ?

        No problem!

        Post back if you need assistance with the caps.

        Toast
        veritas odium parit

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