Announcement

Collapse
No announcement yet.

Asus P8P67 LE shorted VRM

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Asus P8P67 LE shorted VRM

    Hi all, I am trying to repair a motherboard from asus that suddenly stopped working. There was a shorted mosfet in the vrm. I connected the cpu power pins to a lab power supply and a Nikos P0903BDL mosfet (second row in the picture) got very hot. After replacing it with a P0903BDG (already replaced in the pic) the motherboard starts but does not post.

    I noticed that the cpu doesn't get hot without a cooler when the motherboard is turned on. I suspect that there are other defective components in the VRM.

    I have a tester that can test mosfets. Should I just remove all the mosfets from the VRM one by one to test them? Or is there something else I should check first?
    Attached Files
    Last edited by ATB57791; 07-12-2018, 03:59 PM.

    #2
    Re: Asus P8P67 LE shorted VRM

    In the CPU VRM section you need to match the MOSFET or else they will be unbalanced and one of them will heat up and die again. Use the same model, and if possible replace both MOSFET of one phase with the same batch.
    Also usually it's better to replace the driver IC and/or the buck controller as they either could have caused the MOSFET's death, or die at the same time as the MOSFET.

    Boardview attached if needed.
    Attached Files
    Last edited by piernov; 07-13-2018, 02:26 AM.
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment


      #3
      Re: Asus P8P67 LE shorted VRM

      There was also one P0403BDG that had gone bad in the VRM. I don't have a similar replacement for that.

      Can I replace the mosfets and drivers from an Asus P8P67-M REV 3.00 motherboard? I have one that has all voltages OK, but no post. There seems to be a similar design, but the mosfets are of type A09N03 and A09N06 compared to P0903BDL and P0403BDG on the P8P67 LE.

      Comment


        #4
        Re: Asus P8P67 LE shorted VRM

        thanks for the boardview. Is there any schematics available for this mainboard?
        I searched the net and did not find it.

        Comment


          #5
          Re: Asus P8P67 LE shorted VRM

          Usually no schematics for Asus, only boardviews which is already a nice thing to have.
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

          Comment


            #6
            Re: Asus P8P67 LE shorted VRM

            Originally posted by piernov View Post
            In the CPU VRM section you need to match the MOSFET or else they will be unbalanced and one of them will heat up and die again. Use the same model, and if possible replace both MOSFET of one phase with the same batch.
            Also usually it's better to replace the driver IC and/or the buck controller as they either could have caused the MOSFET's death, or die at the same time as the MOSFET.

            Boardview attached if needed.
            thank you

            Comment


              #7
              Re: Asus P8P67 LE shorted VRM

              help! I need bios p8p67 rev 3.0! please!

              Comment


                #8
                Re: Asus P8P67 LE shorted VRM

                Download directly from Asus website.
                OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                Comment

                Working...
                X