Apple macbook pro 820-2936 VD0R - dc in rail 0 sensor above limit. Please help!!

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  • justin35
    Senior Member
    • Jan 2019
    • 149
    • It
    #1

    Apple macbook pro 820-2936 VD0R - dc in rail 0 sensor above limit. Please help!!

    Board 820 2936 b water damage
    Board was not booting, i cleaned the board and i got green light.
    Board started to boot after restoring some bad joints
    Fixed backlight and image
    When i run asd efi for this board it shows up VD0R sensor reading above the limit...
    If i remove the charger the error disappears.
    I have the original 60w adapter.
    Already tried a good known adapter 60w
    And a80w adapter
    All the same...

    Also if the charger is plugged the pc freezes and is slow.

    Please help!!!
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #2
      Re: Apple macbook pro 820-2936 VD0R - dc in rail 0 sensor above limit. Please help!!

      Check SMC_DCIN_VSENSE and PP3V3_S5_AVREF_SMC
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • justin35
          Senior Member
          • Jan 2019
          • 149
          • It
          #3
          Re: Apple macbook pro 820-2936 VD0R - dc in rail 0 sensor above limit. Please help!!

          Thank you very much! The problem was solved!
          Smc_dcin_vsense was bad, r5314 was reading 5.8k instead of 5.49k.
          I checked before voltage on r5313 and it was 2.89-2.9v, i didn't know it should read 2.79v. Also r5313 was reading 27.4k. I got fooled

          If i test the board without battery i get another error: VP0R reading high. Is this normal? With battery it pases all asd efi tests!

          Ps: is there a way or software to see the actual voltages? Like in the attached picture? Thank you!!!
          Attached Files

            Comment

            • piernov
              Super Moderator
              • Jan 2016
              • 4435
              • France
              #4
              Re: Apple macbook pro 820-2936 VD0R - dc in rail 0 sensor above limit. Please help!!

              SMC_DCIN_VSENSE should read around 2.75V (2.79V is ok) with a 60W charger. With an 85W charger it may read around 3.1V and that would trigger the error, it's normal. A 60W charger should not trigger the error.

              VP0R is the SMC_PBUS_VSENSE line. With no battery, PPBUS_G3H should be around 12.56V so SMC_PBUS_VSENSE should be around 2.1V. When the battery is plugged in and charging it will be a bit lower.
              OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                Comment

                • justin35
                  Senior Member
                  • Jan 2019
                  • 149
                  • It
                  #5
                  Re: Apple macbook pro 820-2936 VD0R - dc in rail 0 sensor above limit. Please help!!

                  Thank you for explaining!
                  Any luck with the software i asked?
                  Thanks again!

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