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Acer predator g9 591 791

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    Acer predator g9 591 791

    Hi! P5NCN/P7NCN Rev. 2.0
    I replaced PCH and IT but no change. 3.3v 5v ok, no shortcut anywhere. RTC is in it. I give it 19v and it starts automatically and will restart. After 10 seconds the fan rises to 100%. Holding down the power button will turn off. I unplug the adapter, then plug it back in and do the same thing. I find that it has 1v on the PCH when off. The en2 pin on the NB689 has a 1v. Ic is on. This is not normal.
    I would like to ask for schematic drawing and boardview.

    Help me please
    Thanks.

    #2
    Re: Acer predator g9 591 791

    After these changes it's not simple to detect the problem, you have changed the pch and EC because there was a fault ?
    Look at the components near the pch for possible disconnections
    EC need to be programmed ?
    Attached Files
    Last edited by jasko_jacker; 01-25-2020, 03:48 AM.

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      #3
      Re: Acer predator g9 591 791

      First of all, thank you for your help. The motherboard did nothing.19v after the second fet was shorted. U8200 (NB685GQ) complete short circuit!
      I replaced the ic, 1.0v came out on the coil. I closed the pads but the motherboard did not start. Update the EC bios with IT8587E and "HALLELUJA" enabled on the motherboard. But there is no picture and it always restarts. I have done more measurements and it is off with 1.0v on the ic output. Ic is on. This is not normal. I replaced the PCH, same. I replaced IT, same. Now I need to find out why the U8200 is powered on when the motherboard is off.

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        #4
        Re: Acer predator g9 591 791

        Boardview is a great help, but without schematic it is difficult to find a bug because I don't see resistance values. Info: "vx r0402 small" all resistors. Maybe the drawing is just that? (Or am I not using the program correctly?)
        Help me please, thank you

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          #5
          Re: Acer predator g9 591 791

          Schematic: https://www.badcaps.net/forum/showthread.php?p=938510
          All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

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            #6
            Re: Acer predator g9 591 791

            Thank you very much!

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              #7
              Re: Acer predator g9 591 791

              I found the bug. The NVVDD is very low because it is only 3 ohms ahead of the ground. The U8700 does not turn on and provide information on the PGOOD bus. U7000 is dead. Thanks for all the help, the repair is over.

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                #8
                Re: Acer predator g9 591 791

                NVVDD is GPU VCore, it is supposed to be low resistance to ground. (dunno exact measurement for that GPU though)
                OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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                  #9
                  Re: Acer predator g9 591 791

                  I have like this unit have power but no display is this the normal problem for this kind of jnit

                  Thankss..

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