Apple MacBook Pro 16-Inch 2019 - A2141 - stuck at 5V

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  • martyjelen
    Senior Member
    • Mar 2023
    • 127
    • Czech republic

    #21
    Is this measurements ok?

    Comment

    • mon2
      Badcaps Legend
      • Dec 2019
      • 13859
      • Canada

      #22
      What is the voltage to ground of SSD_PMU_RESET_L? If at 0v, continue to measure the following points of interest:

      (in order of the power up sequence chart - report any that are at 0v; continue otherwise to check each)

      P5V_3V3G3H_EN
      PP3V3_G3H_T
      P3V3MAIN_PGOOD
      P5VG3S_EN
      PP5V_G3S
      P5VG3S_PGOOD
      P1V8G3S_EN
      P3V3G3S_EN

      Comment

      • martyjelen
        Senior Member
        • Mar 2023
        • 127
        • Czech republic

        #23
        SSD_PMU_RESET_L​ - 1,8V

        Comment

        • martyjelen
          Senior Member
          • Mar 2023
          • 127
          • Czech republic

          #24
          P5V_3V3G3H_EN -0V
          PP3V3_G3H_T -3,3V
          P3V3MAIN_PGOOD - 0V
          P5VG3S_EN - 0V
          PP5V_G3S - 3,3V
          P5VG3S_PGOOD - 0V
          P1V8G3S_EN - 0V
          P3V3G3S_EN​ - 0V

          Comment

          • mon2
            Badcaps Legend
            • Dec 2019
            • 13859
            • Canada

            #25
            Some of these measurements do not look correct. If you have a power rail then the _EN signals must be '1'. If you have the measured power rails then the _PGOOD should be '1'.

            Review the following to double-check each:

            Click image for larger version

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            Comment

            • martyjelen
              Senior Member
              • Mar 2023
              • 127
              • Czech republic

              #26
              Hello, sorry for delay.

              PMU_PVDDMAIN_EN - 0V
              P5V_3V3G3H_EN - 0V
              P5VG3S_EN - 0V
              P3V3MAIN_PGOOD - 0V
              P5VG3S_PGOOD - 0V

              Comment

              • martyjelen
                Senior Member
                • Mar 2023
                • 127
                • Czech republic

                #27
                PP3v3_G3H_SOCPMU (measured on C7893/C7869) - 3.3V

                Comment

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 13859
                  • Canada

                  #28
                  P5V_3V3G3H_EN -0V
                  Confirm the voltage to ground on each side of R7652.

                  Remove all power and confirm the resistance across R7652 which should be ~3k3 ohms.​

                  Comment

                  • martyjelen
                    Senior Member
                    • Mar 2023
                    • 127
                    • Czech republic

                    #29
                    0V on each side of R7652.
                    Resistance is about 3,2kΩ​

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13859
                      • Canada

                      #30
                      What is the voltage to ground of PPBUS_G3H @ F7000 / F7001? Is it stable?

                      Comment

                      • martyjelen
                        Senior Member
                        • Mar 2023
                        • 127
                        • Czech republic

                        #31
                        Both are exactly 12.3V/stable.

                        Comment

                        • martyjelen
                          Senior Member
                          • Mar 2023
                          • 127
                          • Czech republic

                          #32
                          I also checked voltage on R7900 (I read on forum that sometimes this resistor is the problem.) There is 3.3V on both sides.

                          Comment

                          • mon2
                            Badcaps Legend
                            • Dec 2019
                            • 13859
                            • Canada

                            #33
                            Confirm the voltage to ground on:

                            R6968 ; CHGR_EN_MVR_R / CHGR_EN_MVR

                            R6934 / R6935 ; PP3V3_G3H_RTC_REG_R / PP3V3_G3H_RTC_X

                            Click image for larger version

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                            Comment

                            • martyjelen
                              Senior Member
                              • Mar 2023
                              • 127
                              • Czech republic

                              #34
                              R6968 - 5.1V on both sides.
                              R6934 / R6935 - 3.3V on both sides.

                              Comment

                              • mon2
                                Badcaps Legend
                                • Dec 2019
                                • 13859
                                • Canada

                                #35
                                Good. Onto steps 6 & 7.

                                Click image for larger version

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                                Comment

                                • martyjelen
                                  Senior Member
                                  • Mar 2023
                                  • 127
                                  • Czech republic

                                  #36
                                  PP3V0_G3H_RTC - 3V
                                  PCH_CLK32K_RTCX1 - 0.5V

                                  Comment

                                  • martyjelen
                                    Senior Member
                                    • Mar 2023
                                    • 127
                                    • Czech republic

                                    #37
                                    Should I continue with next measurements?

                                    Comment

                                    • mon2
                                      Badcaps Legend
                                      • Dec 2019
                                      • 13859
                                      • Canada

                                      #38
                                      Yes.

                                      Comment

                                      • martyjelen
                                        Senior Member
                                        • Mar 2023
                                        • 127
                                        • Czech republic

                                        #39
                                        Step 8 - PCH_RTC_RESET_L - 3V
                                        Step 9 - PMU_XTAL1 - 0V / PMU_XTAL2 - 0.6V
                                        Step10 - PP3V3_G3H_T - 3.3V
                                        Step 11 - PP1V8_SLPS2R - 1.8V
                                        Step 12 - PMU_CLK32K_SOC - 0.8V
                                        Step 13 - PP1V8_AWAKE - 1.8V
                                        Step 14 - PP1V8_SLPS2R_PMUVDDGPIO - 1.8V
                                        Step 15 - PP1V1_SLPS2R - 1.1V
                                        Step 16 - PP0V8_SLPS2R - 0.8V
                                        Step 17 - PP0V82_SLPDDR - 0.8V
                                        Step 18 - PP3V3 _AWAKE - 3.3V
                                        Step 19 - PPVDDCPUSRAM_AWAKE - 0.8V
                                        Step 20 - PP0V9_SLPDDR - 0.9V
                                        Step 21 - P1V1_SLPDDR_SOCFET_EN - 1.8V! (is it OK?)

                                        Comment

                                        • mon2
                                          Badcaps Legend
                                          • Dec 2019
                                          • 13859
                                          • Canada

                                          #40
                                          Step21 - this is the enable pin for the loadswitch @ U7901. The enable voltage can be different than the operating voltage of the switch.

                                          Confirm the voltage to ground on U7901, pins #3 and #5. Are they stable @ 1v1 for each? Then this is ok.

                                          Comment

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