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Thread: PC power supply - no external power switch

  1. #1
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    PC power supply - no external power switch

    I would like to use my shuttle xpc power supply to act as power for my monitor and other 12v devices. I will have it hooked up to an inverter. This power supply does not have an external power switch and i'd like to be able to have it "on" at all times so when I switch on the inverter, it's ready to go. Are there any wires I can short on it to have it "on" without causing any damage to it?

  2. #2
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    I believe theres a wire that you can jump to get it to turn itself on like an old AT style power supply. its like the pwgd or powergood and i think(need 2nd opinion) that you connect it to the +12V rail.

    Or, if BIOS supports it, you can just tell it to start up after a power failure.

  3. #3
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    I am lost.
    if the PSU is on, then the pc is on, is that what you want, have a pc that is on all the time or you just want the PSU to be on but not the pc (you can't do that).

    On the other hand, you can set your bios to turn the pc on when external power is applied, so that when you switch the inverter, your pc comes on. I know, one of my PCs is shuttle and every time there is power outage, the pc comes on by itself when the power is back. That is how I know that we lost power when we are out.

    Unless you want to use the PSU as is without a PC, just a source of power, easy, short the green (PS_ON) to the black (GND) on the connector, that would do the trick.

  4. #4
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    Quote Originally Posted by kingtut
    I am lost.
    if the PSU is on, then the pc is on, is that what you want, have a pc that is on all the time or you just want the PSU to be on but not the pc (you can't do that).

    On the other hand, you can set your bios to turn the pc on when external power is applied, so that when you switch the inverter, your pc comes on. I know, one of my PCs is shuttle and every time there is power outage, the pc comes on by itself when the power is back. That is how I know that we lost power when we are out.

    Unless you want to use the PSU as is without a PC, just a source of power, easy, short the green (PS_ON) to the black (GND) on the connector, that would do the trick.
    Yes i'm using the power supply without the PC. I'm going to hook up the carputer eventually but for now I just want to use power supply. I used a paper clip as a jumper to test it and it works fine. Will this cause any harm to the power supply by doing this?

  5. #5
    FLA gospeed.racer's Avatar
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    Short pin 14 and 15 to turn on, break it to turn off.

    2005 Ford Focus ST

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    Quote Originally Posted by gospeed.racer
    Short pin 14 and 15 to turn on, break it to turn off.

    Thanks. I did notice this though... when I have the ps hooked up to the motherboard i get around 12 volts at the molex connectors. When I have it jumpered to turn on without the motherboard, I get around 13.5 volts. What's the explination for this?

  7. #7
    Variable Bitrate Dracos's Avatar
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    thats because your motherboard is using it an it will be taking some of the power.

  8. #8
    Variable Bitrate Dracos's Avatar
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    so just short the green and any black wire and you will be able to start the PSU. I do it all the time to test them.

  9. #9
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    Quote Originally Posted by Dracos
    so just short the green and any black wire and you will be able to start the PSU. I do it all the time to test them.
    Yep that's what I did. Any long term problems that may harm the supply by doing this?

  10. #10
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    Quote Originally Posted by Zombietime
    Yep that's what I did. Any long term problems that may harm the supply by doing this?
    no, not with ATX PSU, with good old AT, yes only if you don't load the other rail. You are good to go.

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