Low voltage at cpu/chassis fan mobo connectors

By flymike
Sep 20, 2005
  1. My PC shutdown because of CPU high temperature and, after resetting, I found that the cpu and chassis fans on my Asus A7V8X-X mobo were not running. When the mobo is powered up (and before the CPU overheats again) I measure +2v between ground and +12v of the cpu and chassis fan connectors. The fans work ok if I separately apply 12 volts to them.
    What could be causing only 2v instead of 12v at the mobo connectors? Is it the mobo, or is it the PS?
    It's not like it's zero volts like with a blown fuse. But it's 2 instead of 12. And I can find +12v at the PS disk drive accessory connectors. Does the mean the PS is ok? Or are there different +12v outputs from the PS?
  2. SOcRatEs

    SOcRatEs TechSpot Paladin Posts: 966

    Hello! Welcome to TechSpot

    What a drag!
    It sounds to me like the psu is flaked out, it may have taken out the MoBo too.
    If you are not getting power to the cpu fan from the MoBo, then chances are it
    messed up. Most likely the cpu is still good if you did'nt run it to long with no fan.
    There are at least three places to hook a cpu fan in on that A7V8X-X MoBo
    (I have one) A7V8X-E Deluxe
    try a three wire fan on each one to see if they power up too.

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