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Combine 12V rail on DPS 750CB-A

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    #1

    Combine 12V rail on DPS 750CB-A

    Hi. Found this PSU from HP XW9300. Along with its case. I plan to put my 6700k and GA-Z170X-Designare into it's case.. and swap 12V-C rail pin to 12V-CPU_0 and 12V-CPU_1. 12V-C 12.5A would be CPU rail, and 12V-CPU_0 and 12V-CPU_1 12.6A as 6+2 pin x 2 repectedly. Hopes it's enough to power my Windforce R9 290.

    This is the specs of said PSU


    As you can see 12VCPU-0 and 12VCPU-1 got 25.2Amp Combined while 12V-C got only 12.5Amp.

    My question is how can I Draw more amp onto 12V-C without trip OCP in said FakeRail.. (I called it Fake Rail because it is not quitely Seperate rail lol) I need 20Amp minimum the more the better (Damn those single 6 pin power VGA)

    Total combined power of 12V is 55 amp. Wich is quite Impresive for old PSU.



    The source of 12V Is the one that has 8 parallel solder joint near R155, R158, R159.

    12v-C is besides R945

    12vCPU-1 is below R157

    12vCPU-0 is the one that has C162 and R156

    Any pointer will help. Thank you.
    Tags: None
    #2
    Re: Combine 12V rail on DPS 750CB-A

    Take a look at Datasheets of some Protection ICs.
    There are some Resistors you need to change - but not the Shunt Resistors. That's also the worst thing to do, due to the enormous heat capacity of the PCB in that area - you want to avoid soldering in that area at all cost!

    Comment

      #3
      Re: Combine 12V rail on DPS 750CB-A

      I plan to make heatsink for resistor that below R159. Is that help? And wich resistor that I need to change?

      Comment

        #4
        Re: Combine 12V rail on DPS 750CB-A

        Arent those joints of current shunts?
        Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

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          #5
          Re: Combine 12V rail on DPS 750CB-A

          Originally posted by Behemot View Post
          Arent those joints of current shunts?
          Yeah I believe... Those 4 joints

          Comment

            #6
            Re: Combine 12V rail on DPS 750CB-A

            I am still not sure, better take an image of the upper side as well.
            Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

            Exclusive caps, meters and more!
            Hardware Insights - power supply reviews and more!

            Comment

              #7
              Re: Combine 12V rail on DPS 750CB-A

              Originally posted by Behemot View Post
              I am still not sure, better take an image of the upper side as well.
              Okay.. after I comeback to my workshop..

              Comment

                #8
                Re: Combine 12V rail on DPS 750CB-A

                This is upside section of said psu. The white cable is the ones that I want to combine. Each is 12.6 amps.
                Attached Files
                Last edited by Prongs; 03-05-2017, 03:45 AM.

                Comment

                  #9
                  Re: Combine 12V rail on DPS 750CB-A

                  Originally posted by Prongs View Post
                  This is upside section of said psu. The white cable is the ones that I want to combine. Each is 12.6 amps.
                  That, is one nice PSU.
                  Popcorn.

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