Repairing RX460 , VRM?

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  • 90Ninety
    Senior Member
    • Aug 2011
    • 86
    • UK Mains Voltage 240V 50 Hz
    #1

    Repairing RX460 , VRM?

    Hi guys

    In my spare time to upskill myself I buy joblots if stuff to fix , or attempt fixing and get some experience


    I have a r460 that I wanted to fix and give to my nephew
    As shown there is a burned ferrite bead, next to a high/ low side VRM pair on the back side of the card
    ​

    I'm gonna try replacing these pair of VRMs. I wondered how hard they are to remove
    I have a decent sequire solder iron and hot air, though may need to get a hot plate.. Seems these VRMs have big contact plates and could be welded

    Also seemingly ferrite beads on GPUs are usually 0ohm right? Need to get some of those

    Fuse is blown too

    Pictures are attached.. will update progress if any

    Attached Files
    Tags: None
    • ductranvinh
      Senior Member
      • Dec 2021
      • 123
      • Republic of Vietnam
      #2
      Fuse on 12v rail blow up or where ?
      PC work for schemaltic:
      Mainboard: Gigabyte Z68XP-UD4
      CPU: I3-3240
      Ram: 16Gb
      Graphic Card: GTX 1050Ti zotac 4Gb Mini
      SSD: 120Gb
      HDD: 2Tb

        Comment

        • 90Ninety
          Senior Member
          • Aug 2011
          • 86
          • UK Mains Voltage 240V 50 Hz
          #3
          Originally posted by ductranvinh
          Fuse on 12v rail blow up or where ?
          The fuse immediately after the PCIE 12V in from motherboard ( 75W ) .. I have ordered new fuses .. Though unsure of the ferrite bead value here .. Cant seem to get a pack of various values

            Comment

            • momaka
              master hoarder
              • May 2008
              • 12164
              • Bulgaria
              #4
              It looks like a ferite bead only, so you can replace it with a solder bridge, at least for testing purproses.
              MOSFET next to it look like they've been damaged and changed before? If so, and if these are for the RAM V_dd rail, chances are the GPU's dead beyond revival. Common to see V_dd rail shorted on AMD GPUs. But let's cross our fingers here and hope that's not the case. Give the ferite bead a solder bridge across and pray to the GPU gods a little.

                Comment

                • 90Ninety
                  Senior Member
                  • Aug 2011
                  • 86
                  • UK Mains Voltage 240V 50 Hz
                  #5
                  Ok This is now fixed

                  It was fixed by replacing 6508 the mosfet, with a similar N channel mosfet from a donor . This was an educated guess since the resistance from 12V was lowest here , around 500 Ohms

                  Replacing the ferrite bead just blew the fuse

                    Comment

                    • 90Ninety
                      Senior Member
                      • Aug 2011
                      • 86
                      • UK Mains Voltage 240V 50 Hz
                      #6
                      Strangely this card works in PCIE X8 but when PCIE x 16 , there is artificing , fuzzy vertical bars ..

                      Also Device manager shows as Asus , not Gigabyte .. The VBIOS is gigabyte and re-flashed it for good measure

                        Comment

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