AMD Vega 64 Help

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  • spiderspore
    Member
    • Jan 2022
    • 47
    • Ireland
    #1

    AMD Vega 64 Help

    anyone have any experience with Vega64 ?
    never worked on vega before so not sure whats normal for one of these,
    but there's definitely a short on 12v. never seen those kind of mosfets before

    IRF6894 Data Sheet
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    • spiderspore
      Member
      • Jan 2022
      • 47
      • Ireland
      #2
      Re: AMD Vega 64 Help

      found this on back of board, don't know what that component is but its right behind the coil with the short
      Attached Files

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        • spiderspore
          Member
          • Jan 2022
          • 47
          • Ireland
          #3
          Re: AMD Vega 64 Help

          removed it short is still there
          Attached Files

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            • spiderspore
              Member
              • Jan 2022
              • 47
              • Ireland
              #4
              Re: AMD Vega 64 Help

              i repaired that broken pad and found a dead high side mosfet removed it now 12v short is gone

              i have to order some new ones from aliexpress only place i can find it but takes a month for me, would it be safe to power on the board with it removed?
              Attached Files
              Last edited by spiderspore; 04-27-2022, 05:49 AM.

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                • spiderspore
                  Member
                  • Jan 2022
                  • 47
                  • Ireland
                  #5
                  Re: AMD Vega 64 Help

                  i replaced the mosfet and powered on the card and the component on the back sparked and blew the jumper wire i put across it anyone know what the component is so i can order a new one

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                    • SMDFlea
                      Super Moderator
                      • Jan 2018
                      • 21293
                      • UK
                      #6
                      Re: AMD Vega 64 Help

                      Originally posted by spiderspore
                      i replaced the mosfet and powered on the card and the component on the back sparked and blew the jumper wire i put across it anyone know what the component is so i can order a new one
                      You put a jumper wire across it
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                        • spiderspore
                          Member
                          • Jan 2022
                          • 47
                          • Ireland
                          #7
                          Re: AMD Vega 64 Help

                          no i put it across the pad that was damaged there is a pic a few posts back
                          Last edited by spiderspore; 05-06-2022, 09:03 AM.

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                            • spiderspore
                              Member
                              • Jan 2022
                              • 47
                              • Ireland
                              #8
                              Re: AMD Vega 64 Help

                              that component was a current sensing resistor

                              found another short turns out this has two 5v regulators found a short on the one on the back of the board, dont know if it was there already or it was caused when i powered it on traced it to one of the ir3859 drivers replaced it no short now i probed around couldn't find any more

                              when i powered it on the first time the resistance on the bottom 12v inductor was 654ohms its only around 200 ohms now seems too low? the top one is in the kohms

                              any ideas what would cause that? i dont want to power on yet

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