Computer Power Supply

[auvecu]

Whith the Power Supply again.

I have a Power Supply from a Dell computer. Does anybody know what the britges on the 20 pin connector that goes to the mother board should be, so The PS can be powered out of the computer?

Thanks

[_night]

Pinout

Image:atx20f.png

20 PIN MOLEX 39-29-9202 at the motherboard

Image:atx20m.png

20 PIN MOLEX 39-01-2200 at the cable
Pin Name Color Description
1 3.3V Orange +3.3 VDC
2 3.3V Orange +3.3 VDC
3 COM Black Ground
4 5V Red +5 VDC
5 COM Black Ground
6 5V Red +5 VDC
7 COM Black Ground
8 PWR_OK Gray Power Ok (+5V & +3.3V is ok)
9 5VSB Purple +5 VDC Standby Voltage (max 10mA)
10 12V Yellow +12 VDC
11 3.3V Orange +3.3 VDC
12 -12V Blue -12 VDC
13 COM Black Ground
14 /PS_ON Green Power Supply On (active low)
15 COM Black Ground
16 COM Black Ground
17 COM Black Ground
18 -5V White -5 VDC
19 5V Red +5 VDC
20 5V Red +5 VDC

18 AWG is recommended for all wires except pin 11, which should be 22 AWG
For 300W configurations 16 AWG is recommended.

Source: http://www.hardwarebook.info/ATX_Power_Supply

I hope this helps, if this doesn't the wikipedia article on atx or the spec should answer your question.

[auvecu]

Thanks you night. I'll try to set up those connections, but where is the signal I have to give on the 20 pin socket for the PS to work?. I underestand all I should do was to plug the 115 V and rockig and rolling??.

[auvecu]

What should I do with the green cable?. I do not know where should it go.

Thanks

[edgey]

you need to short pin 13 and 14 for the PS to activate.
Hope this helps

[edgey]

The green cable (wire) at position 14 on the 20 pin conector needs to be conected to pin 13. Once you do this the power suppy will work outside the pc. You can use a toggle switch or just directly connect them.

[auvecu]

Thanks, I tryed but did not work. I underestand what has to be done is to connect green wire to ground. But the fan makes a first very short run and stops, and does not work anymore unless i disconnect and wait for a minute or so, and then it makes the same. I'm about to give up with the power supply issue. I was cheated twice for people at eBay with two PS's that did not work and I'm trying with this one now. puffff

[auvecu]

Ah, and the PS still working if 20 pin connector connected to the mother board.

thanks guys

[_night]

If its still working when connected to the mobo, then most likely its not the power supply. Some PSUs also have a switch on the back that turns them on and off that might have something to do with it.

[audioandy1762]

Hi

Have a look at this see if it helps, I think you might need to fit a power resistor as a dummy load before it will work.
http://www.wikihow.com/Convert-a-Com...b-Power-Supply

[_night]

^Wow, I've got to try that with one of my old unused psus.

[pixpop]

A good trick is if you have an old hard drive, just plug it in to one of the power connectors, and ground the green wire. The hard drive will make enough of a load for the PSU to start.

Also, if you find that the +12 Volts is low, e.g. 11.5, you need to increase the load on the +5 and/or +3.3.