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

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

    #41
    Yes. 1.1V, stable.

    Comment

    • mon2
      Badcaps Legend
      • Dec 2019
      • 13847
      • Canada

      #42
      From post #24.

      P5V_3V3G3H_EN -0V
      PP3V3_G3H_T -3,3V ; this voltage is enabled so the _EN signal must be a '1' (not 0v)

      P3V3MAIN_PGOOD - 0V ; this should be '1' if the output voltage rail is stable

      P5VG3S_EN - 0V
      PP5V_G3S - 3,3V ; this voltage is enabled so the _EN signal must be a '1' (not 0v)
      P5VG3S_PGOOD - 0V ; this should be '1' if the output voltage rail is stable
      Confirm that you are measuring the proper pins for the 0V signals. The _PGOOD signals are open drain pins so there must be an external pull-up resistor to a pull-up power rail to park the _PGOOD lines.​

      Comment

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

        #43
        I think I don't understand. Should I measure voltage or not?

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 13847
          • Canada

          #44
          Yes, measure the voltage to ground again of the following:

          P5V_3V3G3H_EN -0V
          P5VG3S_EN - 0V​

          That is, the above cannot be 0V since the output voltage rails are active and stable. This implies the enable signals (above) are '1' = 3v3. Confirm it.

          Comment

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

            #45
            I can confirm that P5V_3V3G3H_EN is 0V. P5VG3S_EN​ is also 0V.

            Comment

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

              #46
              It seems the board definitely died. Suddenly the current draw drops to zero. Now PPBUS_G3H is missing....

              Comment

              • mon2
                Badcaps Legend
                • Dec 2019
                • 13847
                • Canada

                #47
                What is the voltage to ground now of ppbus_g3h?

                Remove all power. What is the exact resistance in ohms to ground of this rail?

                Comment

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

                  #48
                  I removed both fuses. PPBUS_G3H is shorted to ground

                  Comment

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

                    #49
                    0V 0Ω​

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13847
                      • Canada

                      #50
                      Which side? Is it the isl or other downstream side that is shorted?

                      The cpu may be the root cause but suggest to inject 1 volt (max) onto the shorted side and hunt for the part that is heating up. Remove the heatsink off the cpu for inspection.

                      Comment

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

                        #51
                        Pin no. 2 on both F7000 +F7001 is shorted.

                        Comment

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

                          #52
                          C6525 was cracked. I removed it and now we are back. #45
                          Yesterday, 08:38 AM


                          Last edited by martyjelen; 06-06-2025, 07:03 AM.

                          Comment

                          • mon2
                            Badcaps Legend
                            • Dec 2019
                            • 13847
                            • Canada

                            #53
                            What is the resistance to ground of the signals listed in post #45?

                            Very strange that the rails are enabled yet the enable lines are logic low = disable state.

                            Comment

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

                              #54
                              P5V_3V3G3H_EN -50kΩ
                              P5VG3S_EN​ - 50kΩ

                              Comment

                              • mon2
                                Badcaps Legend
                                • Dec 2019
                                • 13847
                                • Canada

                                #55
                                Measure the voltage to ground on each leg of

                                R7652
                                R7691


                                Voltage to ground on pin # VREG5 (pin 29) on U7650.

                                Voltage to ground on pin # VREG3 (pin 22) on U7650.​

                                Comment

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

                                  #56
                                  R7652 - 0V on both sides
                                  R7691​ - 0V on both sides

                                  pin29 on U7650 is PP5V_S5_LDO - 2.5V
                                  pin22 on U7650 is P5VP3V3_VREG3 - 3.3V

                                  did you mean these ?

                                  Comment

                                  • mon2
                                    Badcaps Legend
                                    • Dec 2019
                                    • 13847
                                    • Canada

                                    #57
                                    Yes. Attempt a DFU on this unit. You may have corrupt T2 firmware.

                                    reference:
                                    https://www.badcaps.net/forum/troubl...g3s_en-missing

                                    Comment

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

                                      #58
                                      Mabook is not in DFU. Is this method working for A2141 ?

                                      "Press the power button for about half a second, then also press and hold Left Control + Left Option + Right Shift for 10 seconds, then release all keys except power and hold power until the Target Mac shows up in Apple Configurator on the Host Mac"

                                      Comment

                                      • mon2
                                        Badcaps Legend
                                        • Dec 2019
                                        • 13847
                                        • Canada

                                        #59
                                        Try the switch method:

                                        SWK003

                                        reference:
                                        https://logi.wiki/index.php/DFU_Mode_Restore_(Macs)

                                        Click image for larger version

Name:	dfu_switch.png
Views:	24
Size:	36.5 KB
ID:	3655510

                                        Comment

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

                                          #60
                                          I tried it. It doesn¨t detect in DFU. I tried both left ports.

                                          Comment

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