Is my new power supply DOA?

Zoya · 14-February-08, 05:33 PM

I just tested my new Thermaltake 750 Watt PSU. I hooked it up to my PSU tester per instructions and fired it up. All readings were good for about two seconds then the 5 volt rail died. A second later the whole PSU shut off. I repeated this several times and the new PSU never produced a voltage over a second or two. I believe I got a bad unit but wanted to ask if I was missing anything.

MasterP · 14-February-08, 05:52 PM

Quote:

Originally Posted by Zoya


	I just tested my new Thermaltake 750 Watt PSU. I hooked it up to my PSU tester per instructions and fired it up. All readings were good for about two seconds then the 5 volt rail died. A second later the whole PSU shut off. I repeated this several times and the new PSU never produced a voltage over a second or two. I believe I got a bad unit but wanted to ask if I was missing anything.

Yup - sounds like it's dead for sure

BeetleMan · 14-February-08, 09:50 PM

Have you tried your PSU tester on another PSU?
And have you tried the PSU on a motherboard -cpu setup?

Zoya · 15-February-08, 07:44 AM

Quote:

Originally Posted by BeetleMan


	Have you tried your PSU tester on another PSU? And have you tried the PSU on a motherboard -cpu setup?

I did a little research and tried it again with a hard drive plugged in. It stayed on and the voltage values seemed good. Apparently some high end units need to sense a load to remain on.

Thanks to everybody for their help.

Hak Foo · 15-February-08, 05:38 PM

It's the nature of the beast... a PSU won't run well at SUPER low loads (i. e., just its own fan as a load). Even at like 10% load, the efficiency is often poor.

14-February-08, 05:33 PM		#1 (permalink)
Zoya Apex Techie Lite	Is my new power supply DOA? I just tested my new Thermaltake 750 Watt PSU. I hooked it up to my PSU tester per instructions and fired it up. All readings were good for about two seconds then the 5 volt rail died. A second later the whole PSU shut off. I repeated this several times and the new PSU never produced a voltage over a second or two. I believe I got a bad unit but wanted to ask if I was missing anything.

14-February-08, 09:50 PM		#3 (permalink)
BeetleMan PCApex Corr-Hoe-spondent	Re: Is my new power supply DOA? Have you tried your PSU tester on another PSU? And have you tried the PSU on a motherboard -cpu setup?

15-February-08, 05:38 PM		#5 (permalink)
Hak Foo Apex Elite Tech	Re: Is my new power supply DOA? It's the nature of the beast... a PSU won't run well at SUPER low loads (i. e., just its own fan as a load). Even at like 10% load, the efficiency is often poor.

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