Is the -5V pin in a 24 pin power supply used in a computer?

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Tony Henrich

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Mar 18, 2014
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Something seems to have shorted in my computer. I can smell a burning smell. The computer is not outputting any video. The drives are spinning and I see the LEDs turned on on the MB. I am trying to find which component went bad, I have a power supply tester and all the pin's on the tester are on except for the -5V pin when testing the machine's power supply. I have two other 20pin power supplies which I don't use and they both show the -5V LED as on.

Is the -5V pin needed for the computer? If the tester shows the -5Vpin being on with the 20pin power supplies, I am assuming the 24pin power supply should also output it?
 
Solution
hunter315
The -5V pin on a 24 pin connector will generally not even have a wire running to it. As of ATX 2.0 PSUs no longer need to provide -5V, on most 24 pin connectors that pin isn't even populated. If your new PSU had a -5V rail i would be far more concerned as that would indicate it was an ancient design, its actually good that it doesn't.

As for identifying which part is bad, your nose is likely the best tool for the job, luckily when electronics die they leave you a nice strong odor to find the dead bit with.
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hunter315

hunter315

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May 12, 2009
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The -5V pin on a 24 pin connector will generally not even have a wire running to it. As of ATX 2.0 PSUs no longer need to provide -5V, on most 24 pin connectors that pin isn't even populated. If your new PSU had a -5V rail i would be far more concerned as that would indicate it was an ancient design, its actually good that it doesn't.

As for identifying which part is bad, your nose is likely the best tool for the job, luckily when electronics die they leave you a nice strong odor to find the dead bit with.
 
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