MSI GTX-980ti shorted MOSFET on memory rail

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  • daemon123
    Senior Member
    • Jun 2010
    • 50
    #1

    MSI GTX-980ti shorted MOSFET on memory rail

    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
    Attached Files
    Last edited by piernov; 05-11-2023, 01:28 AM.
    Tags: None
    • ktmmotocross
      Boardkiller
      • Feb 2014
      • 3577
      • slovakia
      #2
      Re: MSI GTX-980ti shorted MOSFET on memory rail

      replace mosfet controller

        Comment

        • daemon123
          Senior Member
          • Jun 2010
          • 50
          #3
          Re: MSI GTX-980ti shorted MOSFET on memory rail

          Originally posted by ktmmotocross
          replace mosfet controller
          Thanks for quick response.

          That would be U8 ?
          The markings on it are hardly readable.

          "08 2F
          227"

          What should i look / search for ?

            Comment

            • ktmmotocross
              Boardkiller
              • Feb 2014
              • 3577
              • slovakia
              #4
              Re: MSI GTX-980ti shorted MOSFET on memory rail

              schematic
              https://www.badcaps.net/forum/showthread.php?p=1237952
              Last edited by piernov; 05-11-2023, 01:29 AM.

                Comment

                • daemon123
                  Senior Member
                  • Jun 2010
                  • 50
                  #5
                  Re: MSI GTX-980ti shorted MOSFET on memory rail

                  Thanks again ktmmotocross for quick reply.
                  I am not an expert. Looked through the file and found the relevant section on page 30.

                  The U8 seems to be either RT8809 or APW8700, looking at the pinout on datasheets and boardviewer file it seems like APW8700 is the correct replacement as RT8809 has a bit different pinout.
                  Is it ok to get APW8700 ? also is there anyway to check whether the culprit really is the PWM controller IC ?

                    Comment

                    • daemon123
                      Senior Member
                      • Jun 2010
                      • 50
                      #6
                      Re: MSI GTX-980ti shorted MOSFET on memory rail

                      Update:
                      Sorry as i am noob and was not fully looking into the matter. Q48 was also shorted, now replaced both. Had display. Will reapply thermal paste and check the card thoroughly. Thanks again for help.
                      BTW can anyone explain what is doubler? which portion is it ?

                        Comment

                        • daemon123
                          Senior Member
                          • Jun 2010
                          • 50
                          #7
                          Re: MSI GTX-980ti shorted MOSFET on memory rail

                          update:
                          started pc and wanted to go to safe mode to get DDU but dooring boot the same thing. PC shut down. It was short lived. What could be the problem ? why are only those fets getting blown ?. Which confirm later if one or both are blow. Q47 Q48

                            Comment

                            • ktmmotocross
                              Boardkiller
                              • Feb 2014
                              • 3577
                              • slovakia
                              #8
                              Re: MSI GTX-980ti shorted MOSFET on memory rail

                              if u have bad controller u will blow them all and burn memory controller or some chips

                                Comment

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