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PSU bench power supply

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#1 hman123467


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Posted 15 April 2015 - 08:29 AM

Hi all
I pulled a 350w psu outta an old Lenovo but there is one problem...
So I found how to turn it on and all and the 12v + and - but when I turned it on
1. The fan would not start
2. It went from 12v to 23v (!)

Can anyone explain why or does it need to have a Sata drive on it and the CPU connected
(NOTE: being used for my dogs kennel for lights and AC. It gets about 45c in there and once it was -1c!)

PSU is by ITE (absolutely NO clue what model)

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#2 Scoop8


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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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