Hello,
I found several articles on the process of using an ATX power supply and convert it to a bench supply. The problem I am having is that the wire color codes and pin outs are not standard ATX. I looked several places, including this website, to see if I could find out what the pin outs would be.
It is a LiteOn 140W PSU with +/-5V, +/-12V, +18V, and +5V standby (underside of the PSU). I actually had to open it to see what wires were what voltage. The board actually has them listed as:
6 Red: +5V
5 Black: Ground
1 White: +18V
1 Yellow: -12V
1 Purple: -5V
1 Grey: PG, I am guessing 'Power Good'
1 Orange: +12V
2 Brown: P/C and F/C (not sure what these are supposed to be)
The pinouts from 1 to 20 are:
Red
Black
Red
Black
Grey
Red
Orange
Yellow
BLANK
White
Brown
Black
Black
Black
Purple
Red
Red
Red
Brown
BLANK
Any ideas? I am out of them.
An atx PSU has the following output voltages and colour
Pin Nnuber Voltage Colour
pin1 +3.3V orange
pin2 +3.3v orange
pin3 comon or ground black
pin4 +5v red
Pin5 comon or ground black
Pin6 +5v red
Pin7 comon or ground black
pin9 +5v for USB Violet Always on !!
pin10 +12v yellow
pin11 +3.3V orange
pin12 -12v blue
pin13 comon or ground black
pin14 PS/On green shortin this one to ground the PSU will turn on
pin15 comon or ground black
Pin16 comon or ground black
pin17 comon or ground black
pin18 -5V White
pin19 +5v red
Pin20 +5v red
You can either check the voltges by colour of the cable or by the number of pin.
Hope I solve your problem.
Martin Iruleguy
Uruguay