Are these mosfets the right ones?

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  • DeXXter
    Senior Member
    • Aug 2023
    • 91
    • Chile

    #1

    Are these mosfets the right ones?

    Hello, I got this motherboard HP G3M dag3mmb2ca0 for repair and I found out that it was a mess, short on cpu's vcc_core and 3vs5 (shorted pch) and a lot of moved capacitors, apparently one of the cpu's dual mosfet got shorted and someone injected 20v directly to it and I don't know if these mosfets are the ones that belong on this motherboard QA3111, I had another victus with i5 (this has i7) and it has different ones (NTMFD1D6N03P8-D).
    Someone who have worked on this motherboard maybe know if these are the right ones? I guess they are, but better be sure, besides they seem moved and not well placed, luckily apparently the gpu is not dead :,)
    Click image for larger version  Name:	HP VICTUS G3M.jpg Views:	0 Size:	261.8 KB ID:	3598022
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  • mon2
    Badcaps Legend
    • Dec 2019
    • 13936
    • Canada

    #2
    These look like the CPU mosfets based on the vicinity of their locations relative to the CPU. Each part should be reviewed for shorts, etc. Worked on by Stevie Wonder?

    As suggested by piernov, if replacing the mosfets, the mosfet drivers should also be replaced. All or nothing. Suggest highly to review against a known good board / schematic to fix up this region.

    Even the fuse in the lower right side ('P') is with a solder blob. At least one of the CPU mosfets is skewed too far to the right and most likely shorting.

    Aside from the above, do measure the resistance to ground of the CPU which may or may not be dead from this failed rework attempt. Suspecting they were on the hunt for a shorted capacitor, etc. when the short may very well be the CPU itself.

    Comment

    • DeXXter
      Senior Member
      • Aug 2023
      • 91
      • Chile

      #3
      Originally posted by mon2
      These look like the CPU mosfets based on the vicinity of their locations relative to the CPU. Each part should be reviewed for shorts, etc. Worked on by Stevie Wonder?

      As suggested by piernov, if replacing the mosfets, the mosfet drivers should also be replaced. All or nothing. Suggest highly to review against a known good board / schematic to fix up this region.

      Even the fuse in the lower right side ('P') is with a solder blob. At least one of the CPU mosfets is skewed too far to the right and most likely shorting.

      Aside from the above, do measure the resistance to ground of the CPU which may or may not be dead from this failed rework attempt. Suspecting they were on the hunt for a shorted capacitor, etc. when the short may very well be the CPU itself.
      Indeed my friend, the cpu got shorted sadly, it has 0 ohm to ground on vcc_core (this cpu should have like 50 ohm), I found solder traces on the main current sensor, so probably when the third mosfet on the middle got shorted (I know this is the one) this guy injected 20v in there. Which I kinda understand, but honestly I have no idea how the 3v rail got shorted (3v power supply is fine), and i found like 20 capacitors and a few more inductors and current sensors taken aside (like the capacitors on the picture) on that line, I guess he was trying to find a "shorted cap"... I bought this motherboard for parts, wanted the cpu for a broken laptop that I have, but no luck this time, at least the gpu and vram memories seems fine.
      Thanks for the answer tho, I don't think it's worth it to try to fix this, but at least I'll try to eliminate the shorts

      Comment

      • mon2
        Badcaps Legend
        • Dec 2019
        • 13936
        • Canada

        #4
        3V is used by the PCH section of the CPU. For giggles, you can remove the malformed mosfet off the board and test the CPU resistance again. Perhaps it is this mosfet that is raising this short condition (cross your fingers). A 20v injection is a killer to most parts.

        Comment

        • DeXXter
          Senior Member
          • Aug 2023
          • 91
          • Chile

          #5
          Originally posted by mon2
          3V is used by the PCH section of the CPU. For giggles, you can remove the malformed mosfet off the board and test the CPU resistance again. Perhaps it is this mosfet that is raising this short condition (cross your fingers). A 20v injection is a killer to most parts.
          Took out the pch and the short on 3v is gone, but the one on vcc_core on the cpu remains, so cpu and pch are gone (this is the weird thing), also took out the shorted mosfet that way I have no shorts on the motherboard anymore, in theory if I replace both, cpu and pch this should work again, but it's a high risk and expensive play, I guess I will just save it in case I find another motherboard 😅

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