Asus P8P67 LE shorted VRM

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • ATB57791
    Member
    • Jun 2012
    • 16
    • Suomi
    #1

    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.
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #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

        • ATB57791
          Member
          • Jun 2012
          • 16
          • Suomi
          #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

            • caspian
              Badcaps Legend
              • Oct 2015
              • 1589
              • Laptop
              #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

                • piernov
                  Super Moderator
                  • Jan 2016
                  • 4435
                  • France
                  #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

                    • lecong1986
                      Member
                      • Mar 2017
                      • 19
                      • vietnam
                      #6
                      Re: Asus P8P67 LE shorted VRM

                      Originally posted by piernov
                      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

                        • lecong1986
                          Member
                          • Mar 2017
                          • 19
                          • vietnam
                          #7
                          Re: Asus P8P67 LE shorted VRM

                          help! I need bios p8p67 rev 3.0! please!

                            Comment

                            • piernov
                              Super Moderator
                              • Jan 2016
                              • 4435
                              • France
                              #8
                              Re: Asus P8P67 LE shorted VRM

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

                                Comment

                                Previous template Next

                                Related Topics

                                Collapse
                                • Scotchmist
                                  Asus GA502D keeps blowing mosfet
                                  by Scotchmist
                                  I have an Asus GA502D, it had a blown mosfet which I replaced and the laptop booted into windows, a few mins later it shut off, the same mosfet was blown. I thought maybe just a bad mosfet but same thing happened again, a few mins in windows and shuts off.

                                  I have removed the mosfet and can run the laptop no problem

                                  The MOSFET is FDPC5018SG

                                  Can anyone point me in the direction of what could be the cause of this, could it be the controller rt3663bc?

                                  Thanks
                                  08-24-2024, 02:23 PM
                                • MicroSMD Lab
                                  ASUS ROG Zephyrus GPU Mosfet repeat failure
                                  by MicroSMD Lab
                                  The board number is GU502DU. I repaired this a couple weeks ago and it came back with the same issue, same mosfet failed (PQH9201). I'm hoping that the GPU was spared this time.
                                  I used the same replacement part (purchased from Mouser) and I'm certain the soldering was done properly since it took just as much effort to remove as before. What could cause this same mosfet to fail? I'm thinking if it was unsuitable then the others would fail too. I looked for similar failures on YTube and the mosfet was replaced with AOE6930 in one instance and AOE6932 in the other but it's possible that the...
                                  01-10-2024, 06:36 AM
                                • Timp74
                                  Odd MOSFET only on some ASUS x99/x299/z370 motherboards..
                                  by Timp74
                                  Hi All,
                                  Could anyone comment on the purpose of the MOSFET circled in red in the attached photo of an ASUS ROG X299 Extreme VRM?

                                  I'm trying to fix an ASUS motherboard(WS x299 SAGE) with a similar VRM where this MOSFET has burnt out along with one of the IR3555m driver chips. From looking at photos of motherboard VRMs on the internet, it seems only some ASUS motherboards have a MOSFET like this. Although I've seen some photos of ASUS z370 boards where it's not populated. The MOSFET is usually a NTMFS4C06N. It has its drain connected to the output of the Vcore VRM, and on...
                                  08-13-2021, 01:11 PM
                                • daemon123
                                  MSI GTX-980ti shorted MOSFET on memory rail
                                  by daemon123
                                  Hi All,
                                  I have this MSI GTX-980ti Gaming Golden Edition. It had shorted mosfet on memory. Replaced the shorted i.e. Q47 PK616BA with 4C09N and the card ran fine for a month. Then suddenly again the same problem. This time when i replace it 4C09N or with replacement PK616BA (Aliexpress) it gets shorted. As soon as turn on the PC the PSU shuts down and the same mosfet Q47 gets short.
                                  What should be the next step. Kindly guide.
                                  The board view files for this gpu is available and attached. https://www.badcaps.net/forum/showthread.php?p=1237952...
                                  05-10-2023, 11:05 AM
                                • ShadowAi
                                  ASUS TUF X570-PLUS doesn't power on: no VRM_EN signal.
                                  by ShadowAi
                                  Hello, I have an issue with the motherboard. Specifically, it doesn't power on, more precisely, the POST initialization doesn't occur.

                                  Let me start from the beginning, the motherboard suddenly stopped working one day. There are no beep signals from the speaker, and the debug LEDs are not lighting up. After inspecting it under a microscope and using thermal imaging, I didn't find anything that could be damaged.

                                  After that, I began voltage measurements, in which I noticed the absence of VDDQ, VDDP, VTT, and VPP lines. Later, I checked if there is an EN state on these lines,...
                                  03-15-2024, 10:46 AM
                                • Loading...
                                • No more items.
                                Working...