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Dead Sun Ultra2 Question-->PS or something else?

Discussion in 'Sun Hardware' started by J'm Sm'th, Jan 29, 2004.

  1. J'm Sm'th

    J'm Sm'th Guest

    My trusty Sun Ultra 2 croaked last night, quietly and without alarm. I
    noticed that the power was off, so I tried the power-on button the
    keyboard--no go. I tried the power switch on the back--the fans spun
    around about 3 revolutions [as though they got a small pulse of
    electricity], then nothing. This 3-rotation thing is repeatable.

    So, I began to unhook hardware--first the drives, then the CPU, then the
    frame buffer, all with the same result. Then I began unhooking the main
    power connectors to the mother board. With all the connectors unhooked,
    *nothing* happens [not even the 3-rotation thing] when the power button
    is hit.

    When I hook the MB connectors back up, the PS does the 3-rotation thing
    [the CPU fans do the same thing].

    So, my question is this: is it the PS, or could this be the MB that is
    the problem? If it is the PS, how can I be sure when I hook a new PS
    up, that there isn't some piece of hardware that will take down this PS
    as well?

    I took apart the PS [I am relative comfortable around electronics, being
    a ham], tested the fuse and it's ok. Not having a schematic, and not
    knowing all that much about switching power supplies, I don't know how
    to proceed.

    Any hints?
    J'm Sm'th, Jan 29, 2004
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  2. J'm Sm'th

    Andrew Tyson Guest

    I took apart the PS [I am relative comfortable around electronics, being
    symptoms sound a lot like those I had when the PS in my U1 died a few years

    i would imagine if the problem was a short on the MB that the fuse in the PS
    have been tripped.

    U2 chassis are so cheap these days you could probably buy one from eBay for
    than a new PS and scavenge the PS.

    just me ten cents worth
    Andrew Tyson, Jan 29, 2004
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    Mike Beckmann, Jan 30, 2004
  4. J'm Sm'th

    J'm Sm'th Guest

    Thanks, but I got a PS off of Ebay for $32 post paid.
    J'm Sm'th, Feb 1, 2004
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