Macbook Pro 820-02733 PP3v8_AON

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  • luckydip
    Senior Member
    • Aug 2016
    • 159
    • uk
    #1

    Macbook Pro 820-02733 PP3v8_AON

    This machine arrived trashed - someone had lifted all the shields and had a go - a mess. I thought it would be a good learning experience as I've never worked on these before. Most of the mess was around the U5700 area, other areas including CD's looked clean.

    Initially when conecting charger - 5V drawing 0.4A - U5700 warming up. Removed it but found Q5820 shoted as well. Ordered all the parts and replaced U5700, Q5820 and Q5840 for good measure.

    This area had missing components/pads destroyed etc - restored all I could see.

    Started measuring around U5700 in diode mode and noticed the PP3v8_AON measuring 40mV and around 90ohms to ground. Couldn't find any measurements for this board to compare with but looked at 820-02020 (seems similar). Openboard data suggests PP3v8_AON should be 351mV (diode).

    Removed R5800,R5820, R5840 to try and see which side the lower resistance was. With these removed I get 333mV on L5800, L5820, L5840 - the other side was around 40mV.

    Tried to inject 3v C5895 (PP3v8_AON) no short just a small current draw 0.03A.

    Am I barking up the wrong tree, is 40mv/90ohms ok for this power rail? Thanks

    [MOD EDIT] Link to schematic - https://www.badcaps.net/forum/troubl...matic-brd-help
    Attached Files
    Last edited by SMDFlea; 01-14-2024, 09:09 AM.
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14021
      • Canada
      #2
      What is the voltage to ground of PPBUS_AON @ F5200? If it is not in the normal range, remove all power -> meter in resistance mode -> measure the resistance to ground @ F5200. Post each measurement.

        Comment

        • luckydip
          Senior Member
          • Aug 2016
          • 159
          • uk
          #3
          PPBUS_AON - 12.3V (T2 non com?) , resistance to ground 2Mohm both sides, diode 453mV (820-02020 openboard has PPBUS_AON diode 504mV)

          [MOD EDIT] Link to schematic - https://www.badcaps.net/forum/troubl...matic-brd-help​
          Last edited by SMDFlea; 01-14-2024, 09:11 AM.

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14021
              • Canada
              #4
              This is M2 based so no T2 chip.

              PPBUS_AON = Normal voltage should be around 12.60-13.1V.
              Review this webpage:

              https://repair.wiki/w/MacBook_Air_A2...w_at_5V_repair

                Comment

                • luckydip
                  Senior Member
                  • Aug 2016
                  • 159
                  • uk
                  #5
                  PPBUS_AON - If the voltage is approximately 12.28-12.35V, it may indicate a communication issue between the SOC and PMICs, or corrupt firmware

                  Not in DFU mode

                  PP3v8_AON​ 0v, voltages around U5700 seem ok, P3V8AON_PWR_EN present, PP5V2_P3V8AON_VDRV 0v which comes from PP5V_S2 - will this be needed for the CD's as well?

                  Looking at the CD's no LDO voltages, PP5V_S2_UPC 0v - generated from UF800. No enable signal from UF840.

                  Inputs to UF840:

                  PMU_SYS_ALIVE_1V8 - 100mV
                  UPC01_5V_EN - 0V

                  PP1V8_S2 0V. Looks like this comes from U5200. Current sensing resistors ok, is it worth changing the U5200?

                    Comment

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