Need help on wire trace ATX PC supply

[MartinL]

"To turn on an atx power supply outside of a computer you need to jumper one of the wires out of the motherboard connecter to ground. There is a pic here that should show which wires to jumper.

http://www.hardocp.com/reviews/cool...ce2/jumper.html "


I got a problem...I checked the jumper black wire and traced it back to the circuit board. It looks like the same as the rest of
the black. So I desoldered all wires with the exception of 12 volts
and hardwire the jumper green wire to one of the black slot.
Now it will booth up for 2 seconds and stop. Is there a special
black wire that goes with the green one???? Can anyone with
ATX supply please have a look inside and advise me. I dont
think the computer shop will be please with me opening up
their power supply. Thanks....

[Mr.RC-CAM]

Do you have a load on the 5VDC output? One is needed for proper operation.

[MartinL]

Originally posted by Mr.RC-CAM
Do you have a load on the 5VDC output? One is needed for proper operation.

ATX 400 watts PC power supply u dont need to put a 5V load.
I have used it b/4 with the jumper setting and it did work fine,
Now after I have desoldered all the wires..left only the 12v..
I hard wire to green wire(trigger wire) to the black on the board
..the bugger wlll not fire up now!!!!! I am wondering if there is a particular slot on the earth(black) that I should use???

Come on..etbadger u can answer that..I can't email U

[Alfred]

Hi MartinL

Did you ever resolve your problem with the ATX PS? I am about to start on one. So far it looks like I will get a clean 12 volts out of the yellow lines, even with no load on the 5 volt line.

To start it, the green wire needs to be connected to earth or netural right and this circuit stays closed as long as the unit is on??

Alfred

[vkmaynard]

Same happened to me. There were two orange wires tied together in the ATX connector that needed to be tied together on the board. Look for any wires that came together in the ATX connector.

Victor

[MartinL]

Originally posted by Alfred
Hi MartinL

Did you ever resolve your problem with the ATX PS? I am about to start on one. So far it looks like I will get a clean 12 volts out of the yellow lines, even with no load on the 5 volt line.

To start it, the green wire needs to be connected to earth or netural right and this circuit stays closed as long as the unit is on??

Alfred

Still sitting in the workshop ready to be thrown out.
Now what this orange wires connected together???
I did not study all the wires b4 I desoldered it..now I dont
have a clue which is supposed to be piggyback.. the older
units dont have this problem. So b4 u desolder all wire
do a drawing and note down the wires.

I am now putting 2 older types in parallel to get 24 amps at
12 volts. Just bought 2 units last Sunday..need to ask how best
to connect it up in one box.

[Alfred]

Hi MartinL

Look up the thread by me about putting together a 12 volt computer power supply. It is clear, step by step directions of the AT PS, instead of the vague stuff normally found on the net.

Do so at your own risk, but my worked verywell till it suddenly died a few weeks ago. I could pull up to 8 amps constant. May be that killed it as I had left it on for about 2 months!!!

Alfred

[ACCIPITER]

Mr RC_CAM is correct as all multi voltage switchers I have worked with have had to have a load across the main volts output, in this case the 5V output to operate.

Robert W

[Alfred]

Originally posted by ACCIPITER
Mr RC_CAM is correct as all multi voltage switchers I have worked with have had to have a load across the main volts output, in this case the 5V output to operate.

Robert W

Hi Robert

This is true with all older style power supplys. The most of the newer designs above 400 watts don't require them anymore. Look for those meant for the AMDs and P4s.

I was very surprised as well. I have a 2 ohm 50 watt resistor on stand by, but turns out that I get a stable 12.1v by just shorting the power on line (green) with any neg line. Have since put on a simple switch. I didn't even have to connect the power good line (grey) to a neg line.

The brand is Digituz and it is designed for a P4. I can pull 15A from the 12v lines.

Alfred

[ACCIPITER]

Tnx Alfred, I guess im falling behind the technology curve as ive worked mostly with older semiconductor manufacturing eq., older power one and lamda systems, Tegals and Matrix systemsalong with SVG and FSI.

Robert W