Macbook Pro A1706 820-00239-A 20v but not run

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  • sdogs
    Senior Member
    • Feb 2016
    • 81
    • Italy
    #1

    Macbook Pro A1706 820-00239-A 20v but not run

    Hello everyone, I have a macbook pro 13 A1706 with the logic board that doesn't want to start.
    It has 20v input, very little absorption, it doesn't heat up, I don't know the story but it looks like it hasn't been worked on.
    I suspect the CPU may be dead, but I also have suspicions about the u7210 and U7800, I have checked the capacitors near the CPU but they don't appear to be damaged.
    what can i try? U7800 reballing? will it be the right way?

    I made the following measurements:

    PPBUS_G3H ---13V
    PPBUS_HS_CPU ---13V
    PPBUS_HS_OTH5V ---13V
    PPDCIN_G3H ---20V
    PP3V3_G3H ---3.3V
    PP3V3_G3H_SMC_ISNS ---3.3V
    PPVCC_S0_CPU ---0V
    PPVCCIO_S0_CPU ---0V
    PPVCCPRIMCORE_SUS_PCH ---0V
    PP1V8_SUS ---0V DIODO MODE ---0,28 ohm
    PP1V8_S4 ---1,8V
    PP1V8_S3 ---0V ---0,10 ohm
    PP1V8_S3_MEM ---0V ---0,10 ohm
    PP1V8_S0 ---0V ---0,32 ohm
    PP1V0_SUS ---0V ---0,02 ohm
    PP5V_S5 ---5V
    PP5V_S5 ---5V
    PP5V_S4 5V
    PP5V_S0 ---5V
    PP3V3_S5 ---3,3V
    PP3V3_SUS ---3,3V
    PP3V3_S5_T139 ---3,3V
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13829
      • Canada
      #2
      Re: Macbook Pro A1706 820-00239-A 20v but not run

      Review the power rails here:

      https://logi.wiki/index.php/Power_Rail_List#A1706

        Comment

        • sdogs
          Senior Member
          • Feb 2016
          • 81
          • Italy
          #3
          Re: Macbook Pro A1706 820-00239-A 20v but not run

          I checked following the binary listing, maybe I missed something? The problem seems to be related to PPVCC_S0_CPU and other binaries related to that sector.
          Excuse me but I don't have a great experience and I'm trying to understand better

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13829
              • Canada
              #4
              Re: Macbook Pro A1706 820-00239-A 20v but not run

              You may have a dead CPU fault. Remove all power. Meter in resistance mode.

              Check the resistance to ground of the following points of interest:

              PPVCC_S0_CPU
              PPVCCGT_S0_CPU
              PPVCCSA_S0_CPU

                Comment

                • sdogs
                  Senior Member
                  • Feb 2016
                  • 81
                  • Italy
                  #5
                  Re: Macbook Pro A1706 820-00239-A 20v but not run

                  here are the measurements

                  PPVCC_S0_CPU 3,3 ohm
                  PPVCCGT_S0_CPU 1,2 ohm
                  PPVCCSA_S0_CPU 1,3 ohm

                  what do you think about it? Do you think the cpu isn't doing very well?
                  thank you very much for taking the time to me ;-)

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13829
                      • Canada
                      #6
                      Re: Macbook Pro A1706 820-00239-A 20v but not run

                      reference:

                      https://boards.rossmanngroup.com/thr...v-0-25a.59321/

                      Remove all power. Meter in resistance mode.

                      One meter probe to PPBUS_G3H; other meter probe to PPVCC_S0_CPU.

                      What is the measurement?

                        Comment

                        • sdogs
                          Senior Member
                          • Feb 2016
                          • 81
                          • Italy
                          #7
                          Re: Macbook Pro A1706 820-00239-A 20v but not run

                          it doesn't have a constant value, it seems to drop to settle at about 13k ohms

                            Comment

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