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How do I keep this PSU on without a motherboard?

I have a DELL DPS-450FB PSU and want to use it as a lb power supply, I cannot get it to switch on, any idea how?
Reply to DylanB
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  1. What is "lb power supply" ?

    What are you trying to do?
    Reply to USAFRet
  2. to turn on a psu without a motherboard you need to short out the green wire to any black (earth) wire with some solder or a paper clip
    Reply to aatje92
  3. USAFRet said:
    What is "lb power supply" ?

    What are you trying to do?



    Sorry, what I meant was " Lab power supply".
    Reply to DylanB
  4. DylanB said:
    USAFRet said:
    What is "lb power supply" ?

    What are you trying to do?



    Sorry, what I meant was " Lab power supply".


    OK...still not getting it. Supply power to and for what?
    Reply to USAFRet
  5. aatje92 said:
    to turn on a psu without a motherboard you need to short out the green wire to any black (earth) wire with some solder or a paper clip



    There are no wires coming from it, it is a server PSU and only has a socket where it connects to the server
    Reply to DylanB
  6. USAFRet said:


    OK...still not getting it. Supply power to and for what?


    I need a constant high-current supply at different voltages which , this PSU can supply,
    Reply to DylanB
  7. OK...it's for a PowerEdge server. Are you trying to use it for some other purpose?

    If that is the case, you'll need full schematics and pinouts of what it supplies, and what it needs to be 'on'.
    Reply to USAFRet
  8. USAFRet said:
    If that is the case, you'll need full schematics and pinouts of what it supplies, and what it needs to be 'on'.


    Yep, that's pretty much the case, I've tried a couple of sites to find the pinout but came up empty, and all I really need to know is what it needs to be switched "on".
    Reply to DylanB
  9. Best answer
    Shorting the four pins shown in red together is suppose to turn on the PSU:

    Reply to ko888
  10. ko888 said:
    Shorting the four pins shown in red together is suppose to turn on the PSU:



    Thanks!, I will give it a try in the morning.
    Reply to DylanB
  11. ko888 said:
    Shorting the four pins shown in red together is suppose to turn on the PSU:



    I een trying all day, and different pin combo's, all I've found is a 5v pin that trips the relay on the main board to reset the supply, other than that, nothing switches on. Thanks for the help though,
    Reply to DylanB
  12. I know it's a very old topic, but it might be still interesting who has psu like this one, to turn on connect the followings together: 7-10-11, 1-8, 3-20.
    I tested in several times, it's working! ;-)
    Regards, Steve
    Reply to stevesoldier
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