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My power supply tester says -5 volt is bad

Last response: in Components
March 24, 2012 12:47:57 PM

my power supply testers say the negative 5 is not working on the psu the psu maker said it isn't used and not needed is this for real? all 10 say no -5 tried 3 differant testers!!!
a c 243 ) Power supply
March 24, 2012 2:25:41 PM

-5v is no longer part of the ATX spec and was optional for quite a few years, take a look at your psu label, does it claim to have a -5v rail ?
Look at the 20/24 pin connector, is there a pin missing ?
a c 1200 ) Power supply
March 24, 2012 4:54:27 PM

January, 2002 is when the -5V specification was removed from the ATX12V Power Supply Design Guide.

The -5V rail was used for old-school floppy disk drive controllers and some ISA bus cards.