Power Supply
Power Supply
How to turn on POwer Supply of computer without attaching it to motherboard?
technically how does motherboard send signal to power supply to turn itself off when you shutdown.
And when I remove power supply from mother board and system, plug it in to power yet it was not turning on. The CPU power button might be touching one or several pins of the power supply to turn on. What are these pins???
I am refereing to an ATX system.
I would like to know this for troubleshooting purposes.
Thanks so much.
You want to read the ATX power supply spec at http://www.formfactors.org/developer/specs/ATX12V_PSDG_2_2_public_br2.pdf.
The signal to turn on the power supply is called PS_ON#. Basically, short this to ground to Make Your rails come up.
See figure 11 to get the connector pinouts and wire colors. PS_ON# is supposed to have a green wire, and the grounds are black.
The old AT power supplies used to need a load to operate. You had to go find a huge resistor and place it between one of the supplies and ground for the PSU to come up. ATX supplies are more forgiving, and have this handy signal for this purpose.
–N.
Converted Computer ATX Power Supply to Lab Power Supply Unit
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