Turning ATX on without Mobo?

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Karchiveur
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Turning ATX on without Mobo?

Post by Karchiveur »

Hey,

Alright.. I've got a few sare ATX PS's sittibg around, and I wanna make some thermite,
these PSU's will work perfectly, I'm just not sure which wires to cross in the Main Molex to turn it on, I'm not using a mobo or anything... just the psu. and some nails... lol ;)
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Karchiveur
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All hail google!

Post by Karchiveur »

http://www.compute-aid.com/atxspec.html

now I couldn't find anything on AT ps's.. :(
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Re: All hail google!

Post by impuresoul2k3 »

Originally posted by Karchiveur
http://www.compute-aid.com/atxspec.html

now I couldn't find anything on AT ps's.. :(


AT Power Supplies have a switch hard wired to them ;)
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Post by FlyingPenguin »

FOR ATX PSUs:

http://xtronics.com/reference/atx_pinout.htm

Short pins 14 & 15 (or just ground pin 14).

WARNING: If you don't have a load on the 5 volt rail, you'll probably blow the PSU. That's why it's recommended you use a PSU tester with a resistor dummy load like this one:

http://www.newegg.com/app/ViewProductDe ... 011&depa=0

AT PSUs are hard wired to an AC power switch. Very dangerous.
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Post by impuresoul2k3 »

Originally posted by FlyingPenguin

AT PSUs are hard wired to an AC power switch. Very dangerous.


Last time I checked, when you pushed the switch in it turned on. The switch is even encased in rubber, not dangerous at all.

Maybe I just didn't explain well, an AT PSU has a switch already attached to it nothing to do but push it.
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Post by eGoCeNTRoNiX »

Originally posted by impuresoul2k3
Last time I checked, when you pushed the switch in it turned on. The switch is even encased in rubber, not dangerous at all.

Maybe I just didn't explain well, an AT PSU has a switch already attached to it nothing to do but push it.


Actually there are still some pins you have to short or it won't "stay" on.. :)

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Post by Viperoni »

Originally posted by FlyingPenguin
FOR ATX PSUs:

http://xtronics.com/reference/atx_pinout.htm

Short pins 14 & 15 (or just ground pin 14).

WARNING: If you don't have a load on the 5 volt rail, you'll probably blow the PSU. That's why it's recommended you use a PSU tester with a resistor dummy load like this one:

http://www.newegg.com/app/ViewProductDe ... 011&depa=0

AT PSUs are hard wired to an AC power switch. Very dangerous.


FP, I've never hurt any PS's through this method, and infact, I used a cheapo Deer with a car audio amp only running off the +12v rail with nothing on the +5v at all.... it ran for a few months like that. Then I used the +12v rail only to power a small 2w amplifier...

Though I agree it's a good idea to give it a load, I don't think it's a big deal.
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Post by impuresoul2k3 »

Originally posted by eGoCeNTRoNiX
Actually there are still some pins you have to short or it won't "stay" on.. :)

eGo


Can you explain more about this? Never heard about having to do that
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Post by eGoCeNTRoNiX »

Originally posted by impuresoul2k3
Can you explain more about this? Never heard about having to do that


May have just been my luck? I tried using an old AT PSU to power fans just for test purposes, and it wouldn't stay on for nothin'.. Read somewhere something about having to have a red and a green wire connected to give it a 3v load or some crap.. Not sure.. :)

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Post by Karchiveur »

heh yeah.. i could get it on for a few seconds.. than it powers down.. i think it expects a certain load back.. on the OLD AT's...

NO clue tho... :)
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Post by dadx2mj »

AT PSUs are hard wired to an AC power switch. Very dangerous.
Why does that make them dangerous? Curious because I keep one around for testing fans and such. Or like when I set up my water cooling I used it to power the pump to check for leaks before turning on PC.
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Post by Karchiveur »

maybe very dangerous..as in.. 120v. is running through it?!
;)
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Post by impuresoul2k3 »

Originally posted by eGoCeNTRoNiX
May have just been my luck? I tried using an old AT PSU to power fans just for test purposes, and it wouldn't stay on for nothin'.. Read somewhere something about having to have a red and a green wire connected to give it a 3v load or some crap.. Not sure.. :)

eGo


Musta been a bad PS, I test fans and even used one to power a car stereo to make sure it worked and the PSU stayed on.
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Post by FlyingPenguin »

Some ATX PSUs (the better ones) will turn themselves off if they detect problems with any of the rails. Not having a load on the rail would probably qualify.

AT PSUs are "dangerous" because the wire for the power switch carries 120 volts AC.
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Post by impuresoul2k3 »

Maybe so, but so does the power wire for your computer and monitor. Do you ever worry about touching them? AT power supply switch wires are insulated too
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