How to modify a PSU to run without a motherboard???

[vulcan5d]

Hey I need a power supply for testing some custom work I'm doing. Problem with power supplies is that they will not work unless they are connected to a motherboard and you push the power button. I cannot do this, one wrong move and I not only fry my power supply but my motherboard. So, any simple and quick mod to do so the power supply will run without the motherboard?

My guess I have to wire up one or two of the pins found on the connector that goes to the motherboard, what do you guys think?

[Milkman]

these are the connections you jump on the atx connector

[vulcan5d]

Thanks for the pic. By any chance do you know how the connection is for an "AT" power supply? I got an old computer lying around, would prever to use the PSU from it instead of my nice 420W ATX :).

[Milkman]

Not sure on an AT, Pm Doc, he may be able to tell ya.

[teezer]

when you jump that connection on an atx psu, does it matter on how long you leave it jumped? ~~~ forever? ~~~ i have an atx psu tester and they say just a short time?

[AlucardCasull]

I would like to know this also, i want to get a pelt and im not wanting to put out 200 for a new psu

[Caeberos]

for an atx psu the connection that you are making in this case you have to keep closed in order for the psu to remain active. http://www.gideontech.com/guides/psu_powerup/ has a guide on how to do this, and should be helpful.

I am no expert on pelts, but from what i have read most people have a special psu to run them at proper voltages, an atx psu like this one is mostly for fans (i use it to test hardware i don't want to hook up to my normal psu first :rolleyes:) Besides if you are really going to run a pelt off an atx psu, you arn't using the 3.3v and 5v rails at all, they are just being wasted. JMO


Good Luck

[Maximouse]

Originally posted by vulcan5d
Thanks for the pic. By any chance do you know how the connection is for an "AT" power supply? I got an old computer lying around, would prever to use the PSU from it instead of my nice 420W ATX :).

You should not have to make any mods to an AT psu.

I use one for testing fans and all I have to do is turn the switch on:)

Al

[AlucardCasull]

I got this picture from somewhere else in the forusm that say you have to connecty pins 14 and 17, while gideontech says 13/14, whos right?

[larrymoencurly]

The green wire (pin 14) to any black wire, like pin 13, 15, 16, 17, 3, 5, or 7, which are all ground.