Short circuit on soldered RAM on PC Asus X751L

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  • totof
    Senior Member
    • Feb 2017
    • 157
    • france

    #1

    Short circuit on soldered RAM on PC Asus X751L

    Hello,

    The motherboard of my Asus X751L PC (reference X751LD rev 2.3) is HS because when I turn on the PC all the voltages are good but 3 of the 8 RAM chips are vey hot and the PC does not start.
    I see that there is a short circuit on the RAM power supply (1.8V).

    Do you think if I remove all the RAM chips soldered to the motherboard and add an external RAM stick to the DIMM socket it might work?

    Thanks
  • totof
    Senior Member
    • Feb 2017
    • 157
    • france

    #2
    Re: Short circuit on soldered RAM on PC Asus X751L

    I unsoldered the 8 memory components and inserted a RAM module into the SO-DIMM socket.
    There is no longer the short-circuit, all the voltages are correct but the PC does not start correctly (black screen, consumption 0.23A).

    Comment

    • ktmmotocross
      Boardkiller
      • Feb 2014
      • 3553
      • slovakia

      #3
      Re: Short circuit on soldered RAM on PC Asus X751L

      u must disable onboard ram or repair it. and rams voltage is 1.35V or 1.2V

      Comment

      • totof
        Senior Member
        • Feb 2017
        • 157
        • france

        #4
        Re: Short circuit on soldered RAM on PC Asus X751L

        Indeed the voltage of a RAM is 1.4V and not 1.8V as I indicated in a previous message.
        On the other hand, how to disable the onboard RAM on this mainboard ?

        Comment

        • rediii
          h???, spurrrn
          • Mar 2018
          • 485
          • somewhere in europe

          #5
          Re: Short circuit on soldered RAM on PC Asus X751L

          here, maybe it helps!
          Attached Files

          Comment

          • totof
            Senior Member
            • Feb 2017
            • 157
            • france

            #6
            Re: Short circuit on soldered RAM on PC Asus X751L

            Thank you rediii but it seems to be not the same board.
            I found information for board X751LD rev 2.0 (not 2.3) and i will try.
            To be continued ...

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13829
              • Canada

              #7
              Re: Short circuit on soldered RAM on PC Asus X751L

              See attached - which one is yours ?
              Attached Files

              Comment

              • totof
                Senior Member
                • Feb 2017
                • 157
                • france

                #8
                Re: Short circuit on soldered RAM on PC Asus X751L

                It's X751LD_2.3_60NB08D0_MB1600

                Comment

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 13829
                  • Canada

                  #9
                  Re: Short circuit on soldered RAM on PC Asus X751L

                  Attached,
                  Attached Files

                  Comment

                  • totof
                    Senior Member
                    • Feb 2017
                    • 157
                    • france

                    #10
                    Re: Short circuit on soldered RAM on PC Asus X751L

                    Thank you mon2.
                    I have moved R2145 to R2144 (for PCB_ID0 signal) and R2153 to R2146 (for PCB_ID1 signal) to disable onboard RAM but unfortunately it does not change nothing.
                    To be continued ...

                    Comment

                    • totof
                      Senior Member
                      • Feb 2017
                      • 157
                      • france

                      #11
                      Re: Short circuit on soldered RAM on PC Asus X751L

                      Hello.
                      After unsoldering the onboard RAM and disabe it, the computer still won't boot.
                      All the voltages are good, one of the LEDs lights up permanently before even pressing the power on button.
                      Consumption is constant at 0.23 A. If I press the power ON button for 10 seconds, consumption goes back to 0 very briefly.
                      With my little thermal camera I observe that the 0.9V and 1.7V coil are a little hotter than the others components.

                      I'm a little out of ideas.

                      Could it be a bios problem ?
                      Last edited by totof; 03-26-2023, 08:44 AM.

                      Comment

                      • blzblz
                        New Member
                        • Mar 2023
                        • 5
                        • Bangladesh

                        #12
                        Re: Short circuit on soldered RAM on PC Asus X751L

                        Thank you for all I learned a lot of things

                        Comment

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