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ASUS ROG Zephyrus GPU Mosfet repeat failure

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    ASUS ROG Zephyrus GPU Mosfet repeat failure

    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 exact replacement was not available at the time of those repairs?
    While removing the black plastic on the opposite side of the board, PR9115 came off, a couple of the other components in the area also looked like they were suffering from "cold solder". It is part of the current sense circuit for this particular mosfet.
    Should I consider replacing the mosfet with the AOE replacememts or is it likely that this resistor contributed to the repeat failure of this mosfet?

    #2
    Originally posted by MicroSMD Lab View Post
    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 exact replacement was not available at the time of those repairs?
    While removing the black plastic on the opposite side of the board, PR9115 came off, a couple of the other components in the area also looked like they were suffering from "cold solder". It is part of the current sense circuit for this particular mosfet.
    Should I consider replacing the mosfet with the AOE replacememts or is it likely that this resistor contributed to the repeat failure of this mosfet?
    PQH9201 IS DUAN N-MOSFET FDPC5018SG

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      #3
      Sorry, I forgot to mention that FDPC5018SG is the mosfet I bought from Mouser which failed after very little use.

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        #4
        The current sense circuit is a must to allow for the power rail regulator to gauge or throttle the power being delivered and / or being consumed by the load. This is the feedback to determine if all is well and to prevent downstream damage. The current sense circuit should be rebuilt. Flux and apply it and then cleanup the flux mess with ipa (alcohol).

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          #5
          As always MOSFET driver must be replaced at the same time as the MOSFET, and gate/bootstrap resistors must be checked.
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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            #6
            Thanks for the good advice as usual mon2 and piernov . The driver is TPS53603ADRGR which seems to be available from China only. Can you advise of any suitable replacements?

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