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How do you test a power supply

K

kwo

Golden Member
I just recently repaired a Delta PS from a G4 Sawtooth that had some blown caps. Replaced about a dozen caps (only one was bubbled - PS fan had stopped working at some point).

Anyway, I can jump the PS to work sans motherboard and put some CDROM drives on it to create a +12v load to keep it running.

I can measure the +3.3v, +5v, +12v rails, but is there additional testing that can be done by a bloke with a multimeter?

I don't have access to an oscilloscope or anything such as that....so....... 😎

I just want to do everything I can to "test" this PS before I put it back into the system.....

Suggestions/comments welcome.... 🙂
 
I generally just check what you already have to see if the voltages are in range. I then hook it up to a system and then check the readings agian after the system is started up to see how they are faring. If it boots and all is looking OK with the voltages, I will run Prime 95 and memtest86 individually for several days at a time, periodically checking the readings again. If all goes well I then declare it safe to use.
 
Ground your black then hook the red up to the line? I'd imagine that would work... I'm not sure if they draw voltage when they're not hooked up. Your 4pin rails should be 5v/G/G/12v I'm not sure about the on the main connector... Browns should be 3v red 5v green 5 orange 12v, then again some will be always on aux. connectors and some may not have current through them. Your Best Bet would be to buy a PSU tester. You can always go into your local computer shop and ask nicely if they can hook a tester up to it real quick 🙂 they may do it for free.
 
Set the multimeter for up to 12 VDC. Put black to ground (the black wire on the p1 and p4) and red to the colored wires. Yellow is 12, orange is 3.3, purple blue gray red are 5, black is ground. Test the molex connecters the same way, black to ground and red to the color. If the voltage is slighty less or higher then don't worry bout it (like if yellow reads 11). Easiest way is to just get a psu tester and plug it in.
 
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