Brief PSU Functionality Test

Yellowbeard · #1 10-26-2007, 04:44 PM

In many cases, users doing troubleshooting have a situation where there is no apparent power to any portion of the system. They often wonder how they can test the PSU to see if it is working. Short of having a proper PSU tester, you can use this method to do a "quick n dirty" test to see if the PSU will spin up and power the 12v rails.

1. Disconnect the PSU from ALL components in the system.
2. Hook 1 or more cooling fans to the PSU to give it a load. (You can use other items such as HDs but, I recommend using something cheaper and less fragile like a fan)
3. Get a small piece of wire, paper clip, or suitable object and short the 2 pins illustrated below. The voltage present is a very low signaling voltage so no worries of being shocked.

The fans should spin right up. This is not a bullet proof test but, it will let you know if your PSU is powering up properly.

Yellowbeard · #2 10-26-2007, 06:38 PM

optimusplaya · #3 12-27-2007, 05:56 PM

This test doesn't ensure the PSU will be able to power a system, it just ensures it has a current? This test works to power a fan on my newly built system but when I try to power the motherboard and accessories- it gives off a soft clicking noise.

Acreo Aeneas · #4 01-13-2008, 04:44 PM

The test is very basic and is supposed to give a builder an indication as to whether or not the PSU is still functional (working). It does not mean it will handle a particular system's load.

Yellowbeard · #5 01-25-2008, 03:23 PM

Also, keep in mind that some users will do a test like this with no load on the PSU. With no load, the PSU may or may not spin up and if it does, it may emit a clicking sound. This is why you need to put a load on the PSU, like a fan or other device.

Brave · #6 03-11-2008, 08:06 AM

Just for information... I have a enermax infinity 720 PSU and it won't let you do this. I just beeps at you to tell you its detected a fault.
(this can be a pain if you want to leak test your latest and greatest Water block)

Samwise · #7 04-10-2008, 10:48 AM

This is my first build. I plugged in the Corsair 520 PSU, flipped the switch and nothing happened. I thought it was DOA. I found this thread and conducted the test and sure enough everything is fine.

nouze · #8 05-19-2008, 09:04 AM

Hello,

Just buy the 620HX (but not yet the MB).
I want to test it.
Before trying with the paperclip : may i use the same pins for an european version of this psu ?

Thanks.

RAM GUY · #9 05-20-2008, 12:20 PM

Quote:

Originally Posted by nouze

Hello,

Just buy the 620HX (but not yet the MB).
I want to test it.
Before trying with the paperclip : may i use the same pins for an european version of this psu ?

Thanks.

Yes, it is the same.

nouze · #10 05-21-2008, 04:45 AM

Thanks a lot

Still a great customer service since my last visit