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VCCGT mosfet damaged igpu?

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    #1

    VCCGT mosfet damaged igpu?

    acer predator g9-791g, i had previous thread about short 19v, but i solved this problem by replacing mosfet, in fact both two phases, just as a precaution.

    Mosfet that went is responsible for phase B of VCCGT (iGPU) [u8004].

    [Schematics] https://www.badcaps.net/forum/showpo...75&postcount=6

    Damage?
    https://imgur.com/a/VoquX0n

    https://imgur.com/a/9UWjBLp

    can improperly soldered mosfet do this?

    https://cdn.badcaps-static.com/pdfs/...a40e178c24.pdf

    originally manufacturer for this mosfet was coded T, i received from manufacturer G, if this has anything to do.

    Without power adapter plugged in, computer restarts till recovery window. Without drivers and no power supply it boots OK. So i'm not sure if it's mosfets or not.

    I'm not a professional. So i may ask weird questions.
    Last edited by mosfetratus; 12-19-2021, 05:30 AM.
    Tags: None
    #2
    Re: VCCGT mosfet damaged igpu?

    look more like VRAM damage or bad cable

    Comment

      #3
      Re: VCCGT mosfet damaged igpu?

      Originally posted by ktmmotocross View Post
      look more like VRAM damage or bad cable
      igpu uses system RAM, i used prime95 stress test and ms memory diagnostics tool, didn't find any problems.

      bad cable? Without drivers screen is Ok.

      Comment

        #4
        Re: VCCGT mosfet damaged igpu?

        so it is bad memory or GPU. i see u have there gtx970M. it is in mxm and u remove it or it is still there?

        Comment

          #5
          Re: VCCGT mosfet damaged igpu?

          Originally posted by ktmmotocross View Post
          so it is bad memory or GPU. i see u have there gtx970M. it is in mxm and u remove it or it is still there?
          Mosfet which gone bad is high side that connects to CPU's iGPU.

          Open board view, it will be easier to see. U8004 mosfet.

          Where to buy CPU without insane prices? alibaba?

          Comment

            #6
            Re: VCCGT mosfet damaged igpu?

            put MATS test on vram to check

            Comment

              #7
              Re: VCCGT mosfet damaged igpu?

              Originally posted by ktmmotocross View Post
              put MATS test on vram to check
              nvidia gpu is fine. I can play games with it. iGPU is the problem, which means CPU replacement.

              Look at the block diagram, only way to bypass CPU is to use display port.

              Comment

                #8
                Re: VCCGT mosfet damaged igpu?

                Originally posted by mosfetratus View Post
                Mosfet which gone bad is high side that connects to CPU's iGPU.

                Open board view, it will be easier to see. U8004 mosfet.

                Where to buy CPU without insane prices? alibaba?
                Honestly speaking, there is no reliable source to buy soc's. Best is to get one from unrepaired board where you know cpu is fine(some tests has to be carried to be sure). Reballing it is a nightmare though and to solder it properly requires very good skill and machine/tools. If this is your first attempt to replace soc, be prepared for disappointment as it does take time to hone your skill.

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