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Lenovo NM-D031 no display

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    #1

    Lenovo NM-D031 no display

    MB: NM-D031 rev 1.0

    All voltages are present on coils. What i've measured

    01.VDDQ_PWRGD-3.3V
    02.ALW_PWRGD-3.3V
    03.EC_VCCST_PWRGD-3.3V
    04.PCH_PWROK-3.3V
    05.PCH_DPWROK-3.3V
    06.VCCST_PWRGD_R-Present
    07.DRAMRST#-Present

    Consumption goes straight to 600mA and fluctuates a bit to 616-620mA.

    Scope doesnt show any communication On QC701 and on pin108 of ram slot(I dont see the reset though voltage is present).

    Ram is onboard samsung.Ram chips are getting all the voltages like 2.5V/1.2V/0.6V and none is heating.

    PU9800-all requirements checked and verified.

    My observation is lack of communication between PCH and ram-meaning a bad pch perhaps.

    Do you agree or we need to measure anything further.

    PS: Received 4 identical lenovo laptops with very same fault-All have NM-D031 Motherboard. So i doubt my conclusion as its very unlikely that all boards will develop a faulty PCH.
    Tags: None
    #2
    Re: Lenovo NM-D031 no display

    PLTRST# present

    Comment

      #3
      Re: Lenovo NM-D031 no display

      I would go through the power sequence block.
      Attached Files

      Comment

        #4
        Re: Lenovo NM-D031 no display

        @mon2, Thats all checked before posting here. All are present except DGPU part as my board is UMA.

        Comment

          #5
          Re: Lenovo NM-D031 no display

          Problem Solved. All 4 units giving display.

          Problem is onboard ram. After struggling a lot, finally was able to edit the bios succesfully to disable onboard ram. As per schematics, there is no way you can disable onboard ram thru Board_ID resistors.So anyone getting this board with consumption of about 600mA and stuck there, is very likely a onboard ram issue. its 10th Gen intel board.

          Comment

            #6
            Re: Lenovo NM-D031 no display

            Originally posted by mcplslg123 View Post
            Problem Solved. All 4 units giving display.

            Problem is onboard ram. After struggling a lot, finally was able to edit the bios succesfully to disable onboard ram. As per schematics, there is no way you can disable onboard ram thru Board_ID resistors.So anyone getting this board with consumption of about 600mA and stuck there, is very likely a onboard ram issue. its 10th Gen intel board.
            can you please share your bios sir , i want to try it

            Comment

              #7
              Re: Lenovo NM-D031 no display

              No point since your boards consumption is 30mA-so nothing is running up except perhaps 3/5V.

              Comment

                #8
                Re: Lenovo NM-D031 no display

                Originally posted by mcplslg123 View Post
                No point since your boards consumption is 30mA-so nothing is running up except perhaps 3/5V.
                3v and 5v is present but only taking 30miliamp maybe not a bios issue, tried to post a thread sir hope you can check it for me

                Comment

                  #9
                  Re: Lenovo NM-D031 no display

                  Originally posted by mcplslg123 View Post
                  Problem Solved. All 4 units giving display.

                  Problem is onboard ram. After struggling a lot, finally was able to edit the bios succesfully to disable onboard ram. As per schematics, there is no way you can disable onboard ram thru Board_ID resistors.So anyone getting this board with consumption of about 600mA and stuck there, is very likely a onboard ram issue. its 10th Gen intel board.
                  good job. can you share the file I have the same issue

                  Comment

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