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Turning ATX on without Mobo?
Posted: Tue Dec 07, 2004 1:18 pm
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
Jordan
All hail google!
Posted: Tue Dec 07, 2004 1:51 pm
by Karchiveur
http://www.compute-aid.com/atxspec.html
now I couldn't find anything on AT ps's..
Re: All hail google!
Posted: Tue Dec 07, 2004 3:21 pm
by impuresoul2k3
AT Power Supplies have a switch hard wired to them
Posted: Tue Dec 07, 2004 7:35 pm
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.
Posted: Tue Dec 07, 2004 8:22 pm
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.
Posted: Tue Dec 07, 2004 9:16 pm
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..
eGo
Posted: Tue Dec 07, 2004 9:43 pm
by Viperoni
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.
Posted: Tue Dec 07, 2004 10:39 pm
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
Posted: Tue Dec 07, 2004 11:10 pm
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..
eGo
Posted: Tue Dec 07, 2004 11:21 pm
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...
Posted: Wed Dec 08, 2004 12:05 am
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.
Posted: Wed Dec 08, 2004 2:07 am
by Karchiveur
maybe very dangerous..as in.. 120v. is running through it?!
Posted: Wed Dec 08, 2004 7:22 am
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.
Posted: Wed Dec 08, 2004 9:06 am
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.
Posted: Wed Dec 08, 2004 6:38 pm
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