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Old 06-27-2008, 12:32 AM   #1 (permalink)
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Default Power Supply Tester - Lights. Questions.

This is short and simple.

I have a power supply tester.
It has the following lights.

+12v, +3.3v, +5v,
+3.3v, -12v, PG, +5vsb, +12v, -5v, +5v

Which ones should light in order to verify that the PSU works?
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Old 06-27-2008, 12:39 AM   #2 (permalink)
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Default Re: Power Supply Tester - Lights. Questions.

ideally you'll want all of them. but the +5vsb is very low voltage, and sometimes some psu's won't include that so if the light isn't on for that one don't call it dead.
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Old 06-27-2008, 12:42 AM   #3 (permalink)
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Default Re: Power Supply Tester - Lights. Questions.

I tested a PSU yesterday. All lights started, and 1 by 1 they faded. I thought the PSU was damaged, so I got the exact same style computer that was in known working condition to test the PSU just to see what lights came on to compare. It did the exact same thing.

Turns out, the original PSU I checked was dead, yet the 2nd one was not dead... however, both yielded the same lights.
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Old 06-27-2008, 12:44 AM   #4 (permalink)
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Default Re: Power Supply Tester - Lights. Questions.

maybe its a bad tester?

or perhaps the first psu was on its way out and couldn't power the system fully.
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Old 06-27-2008, 01:11 AM   #5 (permalink)
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Default Re: Power Supply Tester - Lights. Questions.

On a blown PSU + good PSU here at home that I have, it yields different results.
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Old 06-27-2008, 06:01 AM   #6 (permalink)
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Default Re: Power Supply Tester - Lights. Questions.

HOW TO: Measuring PSU Rails

Try this.
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