I cannot remember which pins to jumper to test an ATX power supply outside of the box. I have a new box but the business is closed until Friday!

Are the two I have "x"'d the ones I need to jumper?

00
00
x0
x0
00
00
00
00
00
00

Thanks! Doc

Switching power supplies can be damaged if powered up without a load. I found a warning in this ATX power supply info (http://www.compute-aid.com/atxspec.html) link.

"The location of the power-on jumper on the motherboard is manufacture dependent. You will need to read your motherboard manual to locate that jumper. At any event, do NOT try to manually jump-start the power supply without attaching motherboard. Since the power supply is expecting certain sensing circuit feedback to regulate the output voltage, manually starting it without attaching it to the motherboard could cause damage to the power supply."

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reido@my-deja.com

Grrr. So they make it impossible to test the power supply separate from the mobo? So if the mobo is defective one may falsely suspect the power supply? How hard would it be to provide a simple feedback loop in the power supply? Grrr. Perhaps I can find a circuit that mimics the mobo regulation circuit. Thanks for the heads-up! Doc

Originally posted by Reid:
Switching power supplies can be damaged if powered up without a load. I found a warning in this ATX power supply info (http://www.compute-aid.com/atxspec.html) link.

"The location of the power-on jumper on the motherboard is manufacture dependent. You will need to read your motherboard manual to locate that jumper. At any event, do NOT try to manually jump-start the power supply without attaching motherboard. Since the power supply is expecting certain sensing circuit feedback to regulate the output voltage, manually starting it without attaching it to the motherboard could cause damage to the power supply."

I found that there is an ATX power supply tester (http://www.3dcool.com/atxpowersupplytester.shtml) for $17.

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reido@my-deja.com