Macbook Pro A1990 PP5V_G3S missing

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  • geiti94
    Member
    • Feb 2023
    • 16
    • switzerland

    #21
    PP3V3_G3H_RTC_X is 3.3V. PP1V8_SLPS2R​ have 1.81V. U6940 pin 10 are at 0V

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    • mon2
      Badcaps Legend
      • Dec 2019
      • 13894
      • Canada

      #22
      Short / press the power button @ SWK002. Does this change anything.

      Click image for larger version

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      • geiti94
        Member
        • Feb 2023
        • 16
        • switzerland

        #23
        nothing changes. CHGR_RST_IN stays still at 0V. Faulty U6940? I Tryed it to reflow it too with flux and nothing changed. is there any mod for bypass U6940 for testing before i order then a new one?

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 13894
          • Canada

          #24
          What is the default voltage to ground on PMU_ONOFF_L? This should be a logic '1' since there is a pull-up to PP3V3_G3H_RTC_X @ R8015. When the power button is not pressed, the default voltage should be 3v3. There should also be a button or shorting pads @ SWK000 (opposite of the PCB) for the same purpose.

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          • geiti94
            Member
            • Feb 2023
            • 16
            • switzerland

            #25
            i replaced now U6940 with one of a know working board but icloud locked. Pin 10 still 0V. Voltage at R8015 is 3.3V.

            Comment

            • geiti94
              Member
              • Feb 2023
              • 16
              • switzerland

              #26
              that board is strange. all volltages are here. looks like a broken t2 firmware now but i cant enter dfu mode. when i check on the pad dfu_status stays at 0V instead of 1.8V

              Comment

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