ATX Power Supply 1

[tinkertech]

I have an ATX power supply that is hooked up to an AT motherboard. When I power on the PS it fails to start. I undertand that I have to short two of the pins on the ps connector for it to work with an on/off switch. Can someone tell me which two pins to jump and whit is best to use to jump these pins?

 

[Borca]

You have an AT Mother Board and you need an AT Power Supply...

Have fun

 

[mainegeek]

Look on the mobo where the at/atx power connector attches. Their should be a jumper to switch from one or the other.

 

[tinkertech]

Only has AT power connector. I know there is such a thing but just can't remember. Thanks

 

[mainegeek]

I was assuming you motherboard had both types on it.
Its physically impossible to plu an ATX connector into an AT mother board.

 

[tinkertech]

I have an adapter that allows me to plug an ATX connector on to an AT plug. So its not really impossible.

 

[Gloryhound]

Most AT cases have a steady on or steady off solid state switch. ATX power supplies use a Momentary solid state switch. there in lies the problem. the ATX PS is waiting for a momentary short signal from the MOBO to power up, but the AT MOBO can't supply it. Most AT MOBOs don't have the momentary on/off switch ability. You may be able to rig your ATX PS into powering up, but unfortunately I don't have that knowledge. I just hope this info gets you going in the right direction.

 

[franklin97355]

If you have an adapter the adapter should have a place to power up the system.

 

[G0AOZ]

Many of the early TMC AT-style motherboards had dual PSU connectors, so it's perfectly possible to use an ATX PSU with an AT board. The TMC boards had a pin header marked "Dual Function Power Button", and this would be where you'd attach a momentary switch for powering the PC on and off.

However, if you're using some kind of adaptor, you'll need to check with the adaptor manufacturer. I can tell you that ATX PSUs are turned on and off by momentarily shorting pin 14 (wire colour could grey or green) to any pin with a black wire (pins 3,5,7,13,15,16,17).

Good luck!


ROGER - G0AOZ.

 

[mainegeek]

GOAOZ,
That style board was what I assumed he was using as there was no mention of an adapter initially. I still maintain though that it is physically impossible to plug an ATX 20 pin connector into an AT style mobo using the standard P8 &P9 connection.

 

[G0AOZ]

Mainegeek, yes I agree, very difficult. I suppose there's a slight possibility if you carefully rewired... Or you could always try using a bigger hammer


ROGER - G0AOZ.

 

[mainegeek]

Maybe use some of those wire connectors? You know, the kind you use to get your tail lights working on your boat trailer? %-

 

[tinkertech]

Sounds like this has gotten out of hand. The set up have have is a PC104 with an atx power connector problems is this PC104 SBC does not have a mementary switch so I can't just plug in the switch wire from the atxps, so Roger has a good idea, no, not about the hammer, but the no. 14 wire being jumpped to a black wire. I have seen it done, just don't remember which two to jump. What this does is make an ATX p/s be turned on and off pretty much at will. Thanks for all the input, it was enlightning!

 

[edfair]

Actually was an enjoyable speculation by people who know pretty much what is out there. If you'll look back at the comments you'll have to agree that all of them make perfect sense to everybody but you, since they were talking AT or ATX and you just now mentioned PC104, which most have no idea about.
Power on is usually a green wire looking for 0v to turn on. Or pin 14. If you'll look real close you should be able to identify pin 1. And the even numbers on the latch side as far as I know.
Any 0v should do, 7,8,10,12,16 or 18.

Ed Fair
Any advice I give is my best judgement based on my interpretation of the facts you supply. Help increase my knowledge by providing some feedback, good or bad, on any advice I have given.

 

[edfair]

WHOA, I led you astray with the last post. My documentation was wrong. And I get educated too.See the documentation here:

http://www.kaparel.com/products/powerproducts/01a000235.pdf

Ed Fair
Any advice I give is my best judgement based on my interpretation of the facts you supply. Help increase my knowledge by providing some feedback, good or bad, on any advice I have given.