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ATX PSU failure and diagnostics

Discussion in 'Electronic Repair' started by [email protected], Sep 27, 2005.

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  1. Guest

    Good day all!

    I have an ATX power supply for a small form factor PC (Shuttle, I-will
    XPC) and it is currently broken. Inspecting the power supply, i found
    out that when I jumper Pin 14 and Pin 15, the fan will spin (indicating
    that there is power) however it will die out eventually after a few
    seconds. After working with GOOGLE and searching forums and all, I
    found out that a certain TTL transistor is responsible for latching the
    circuit from POWER_OFF to POWER_ON, the problem is, Im not pretty sure
    if this is the right diagnosis, and if there are other possibilities
    why this PSU wouldnt power up.

    I would really appreciate if anybody can give an insight to this, I
    would give further details on my troubleshooting if asked. :)

    thank you very much

    - Mannix
     
  2. Hi
    Den Mon, 26 Sep 2005 20:30:51 -0700. skrev :
    That's proberly not the problem, there will be a 100 other reasons. Is
    folds back for safety reasons, indicating that there is a problem with the
    output voltages.

    My best bet is capacitors, capacitors and capacitor. Replace all
    electrolytics, except the primary ones (2 fat ones rated 350v or so) and
    you're back in business. Remember to use 105deg low esr types.
    http://repairfaq.ece.drexel.edu/sam/smpsfaq.htm

    An excellent introduction. Read it and understand it.Best whishes
     
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