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Thread: Possible to MOD a PSU for -5v?

  1. #1
    Registered User
    Join Date
    Feb 2006
    Posts
    6

    Possible to MOD a PSU for -5v?

    I seem to have a problem. I purchased a Coolmax 700w PSU recently from ebay to replace a defective PSU in my system. Almost immediately I noticed a problem. Now my system has no sound. I checked all kinds of stuff. Thought I shorted something out. Nope..
    Then I remembered that my system, MSI MS-9620 (K8N Master2-FAR) requires -5v for the sound chip to function. This PSU has no -5v. Is there a way to modify this PSU to produce the -5v that I require?
    The PSU model is ZU-700B

    Thanks
    MSI K9NU Speedster
    1 Opteron 2344
    (work in progress)

  2. #2
    Xtreme Enthusiast
    Join Date
    Oct 2006
    Posts
    617
    if you can find a small dc 5v power supply (eg cellphone charger or dc power supply for some other device) you can connect its +ve terminal to ground & use its -ve lead as minus 5 if its output is floating (ungrounded). if i was doing it i'd plug the dc adapter in & connect its +ve terminal to a ground via a resistor & check to see if there was a voltage across the resistor with a multimeter (no or little voltage means its suitable, 5v means its grounded).

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