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compaq psu

Discussion in 'Electronic Repair' started by yhan, Sep 14, 2005.

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  1. yhan

    yhan Guest

    good day,

    well i have here atx compaq psu that only spins its fan a second then
    stops.its first symptoms was low voltage. I measure the voltage on red
    - +4 , yellow - +9 should be +12. Now when i try to turn it on again,
    it only produces a jolt of energy then fan stops. is it a shorted
    component on the secondary side? other possibilities.

    regards,

    ian
     
  2. Dave D

    Dave D Guest

    Could be capacitors. The smoothing caps and/or the small value electrolytics
    in the regulator circuit.

    Dave
     
  3. Clint Sharp

    Clint Sharp Guest

    What part number?
     
  4. yhan

    yhan Guest

    What part number?

    hi!
    its model is HP 212
    PART NO. 278740-001
     
  5. me

    me Guest

    Do you have a proper load on the supply?
     
  6. yhan

    yhan Guest

    hi,
    i connected two hard disks in the supply.
     
  7. bigtom

    bigtom Guest

    i worked on a compaq recently that did the same thing.
    it didn't like having a second cdrom(burner).
    it worked fine with either drive but as soon as i put both in it would
    power on for half a second then shut down.
    i decided to leave out the cdrom and it worked fine.
    have you tried it with just the floppy connected to see if it posts?
     
  8. yhan

    yhan Guest

    hi tom,

    not yet. i'll try sooner. i also tried turning it on while no load but
    w/ same effect.

    ian
     
  9. inti2

    inti2 Guest

    More probably the first : smoothing caps on the secondary sides, make sure
    you mount low-ESR caps, you can gett them from another power supply with
    another fault, (i.e. : an irreparable esemplar)
     
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