Power Supply Tester - Lights. Questions.

[Jayce]

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?

 

[Peter.Cort]

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.

 

[Jayce]

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.

 

[Peter.Cort]

maybe its a bad tester?

or perhaps the first psu was on its way out and couldn't power the system fully.

 

[Jayce]

On a blown PSU + good PSU here at home that I have, it yields different results.

 

[CrazeD]

http://www.techist.com/forums/f77/how-measuring-psu-rails-130666/

Try this.