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Power Supply Multimeter Reading Questions

Last response: in Components
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May 11, 2010 12:37:19 PM

I am looking for opinion on multimeter readings I am getting for power supply that may or may not be dead. System was found off and subsequently un-bootable after a power outage. Tower was plugged directly into the wall and not a surge protector.

20 pin connector wire readings while plugged into the board:

Purple = 4.96 V
Green = 4.04 V
Gray = 2.1 mV

The yellow wires to the P4 power connector, molex, and other power connectors are reading 1.2 mV each. From what I am reading here some of these are not normal readings, however I am new to using the multimeter so maybe a setting is wrong. It was set to detect DC on auto ranging? If more numbers are needed I can post them. Also makes no difference if the power switch is pushed, nothing changes on the readings. System is a Dell Dimension 9100 with 375 Watt Dell L375P power Supply.



Thanks,

Mike

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a c 243 ) Power supply
May 11, 2010 3:19:54 PM

24 pin connector ?

Gray wire ( PWR_OK ) should read around 5v
Yellow wires ( 12v ) should read around 12v

Sounds like the power outage killed your psu.
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a b ) Power supply
May 11, 2010 3:28:34 PM

Yup looks like a dead power supply probably a power surge this is why we use surge protectors.
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May 11, 2010 4:28:46 PM

+1. 12v is gone.
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May 11, 2010 5:33:39 PM

Dell correct 24pin. Thanks for all the replies. Gonna change out the PSU.
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May 18, 2010 1:47:56 AM

Best answer selected by robomerc.
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