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Posted 15 April 2015 - 08:29 AM
Posted 16 April 2015 - 07:43 AM
PC Power Supplies require a load connected to the supply to properly output the rated voltages.
The "PS ON" signal needs to be taken low (grounded) to turn on the P.S.
I bought a spare ATX P.S. to run an internal CD/DVD Drive on my workbench and to have a way to run Sata HDD's outside my PC for testing.
Here's what I did:
- Installed a switch to ground from the "PS ON" line (usually the green wire at Pin 14 for an ATX-20 pin connector or Pin 16 for an ATX-24 pin connector.
- Installed a 5V LED on the "PWR OK" signal output between pin 8 and ground.
As long as an adequate load is connected to the P.S. ie the 5V output, like a Sata HDD as you mentioned, the P.S will turn on and output the proper voltages (the fan will run).
Edited by Scoop8, 16 April 2015 - 07:46 AM.
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