ATX power supply to bench supply conversion

[knightofsolamnus]

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.

[martin Iruleguy]

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