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Asus S400C — VGFX Core no voltage

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    Asus S400C — VGFX Core no voltage

    I have an Asus that turns on and all power rails have voltage except the GPU. I also measured the high side mosfet and on the drain you have 19.42V. On the gate there is 0V.

    I traced this path to an IC( RT8168B) that controls the gate and from my measurements it seems fine, but I don't know with 100% certainty if it is good or bad. I swapped the high side mosfets of the CPU to the GPU and have the same issue.

    How would anyone know when the GPU is bad or the chipset for that matter?
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    #2
    Re: Asus S400C — VGFX Core no voltage

    https://logi.wiki/index.php/User:Pie..._I_solve_it.3F
    I am missing VCCAXG/VCCGFX/VCCGT (iGPU core voltage), how do I solve it?

    The iGPU core voltage is almost never relevant. It typically only comes up when there's a significant load on the iGPU. It can often be seen spiking a couple of times on the oscilloscope when POSTing.

    In other words, it's generally normal that it's missing. If you have some kind of issue with the machine, the cause is most likely elsewhere.
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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      #3
      Re: Asus S400C — VGFX Core no voltage


      Thank you, I have to start looking elsewhere. That wiki page is excellent adn I thank you for that and your time.

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