Macbook A1466 No power

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  • dclass-pro
    Senior Member
    • Dec 2022
    • 157
    • Italy

    #21
    Re: Macbook A1466 No power

    Hi guys, I put this macbook aside and today I got an identical one! the problem is exactly the same, I've tried everything, I've also followed the link you recommended, reset smc and tried everything but the new macbook won't start, every 5/6sec it tries to start, I have 5v for a moment and then shuts down, looping endlessly. What do you advise me to do?

    Comment

    • mon2
      Badcaps Legend
      • Dec 2019
      • 14106
      • Canada

      #22
      Re: Macbook A1466 No power

      What is the voltage to ground of PM_BATLOW_L ?

      Comment

      • dclass-pro
        Senior Member
        • Dec 2022
        • 157
        • Italy

        #23
        Re: Macbook A1466 No power

        PM_BATLOW_L is 3,325V fixed

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 14106
          • Canada

          #24
          Re: Macbook A1466 No power

          Remove all power. Meter in diode mode.

          Red meter probe to ground.
          Black meter probe to point to test.

          Review each pin on J6100 against your logic board.

          https://logi.wiki/index.php/File:820...6100_FInal.jpg

          Post your measurements.

          Comment

          • dclass-pro
            Senior Member
            • Dec 2022
            • 157
            • Italy

            #25
            Re: Macbook A1466 No power

            My J6100 have 32pin

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14106
              • Canada

              #26
              Re: Macbook A1466 No power

              What is the 820-**** number of your logic board?

              The connector of interest is the one that mates with the spi flash chip.

              Comment

              • dclass-pro
                Senior Member
                • Dec 2022
                • 157
                • Italy

                #27
                Re: Macbook A1466 No power

                820-3437-b

                Comment

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 14106
                  • Canada

                  #28
                  Re: Macbook A1466 No power

                  Is PLT_RESET_L pulsing?

                  Comment

                  • dclass-pro
                    Senior Member
                    • Dec 2022
                    • 157
                    • Italy

                    #29
                    Re: Macbook A1466 No power

                    no, is always 0v

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 14106
                      • Canada

                      #30
                      Re: Macbook A1466 No power

                      Remove all power. Meter in DIODE mode.

                      Red meter probe to ground.
                      Black meter probe to point to test.

                      Measure the DIODE reading of PLT_RESET_L.

                      What is the measurement ?

                      Comment

                      • dclass-pro
                        Senior Member
                        • Dec 2022
                        • 157
                        • Italy

                        #31
                        Re: Macbook A1466 No power

                        in diode mode 0.521 is not shorted

                        Comment

                        • mon2
                          Badcaps Legend
                          • Dec 2019
                          • 14106
                          • Canada

                          #32
                          Re: Macbook A1466 No power

                          Review the voltage to ground of each of the highlighted pins on the SPI flash device @ U6100.
                          Attached Files

                          Comment

                          • dclass-pro
                            Senior Member
                            • Dec 2022
                            • 157
                            • Italy

                            #33
                            Re: Macbook A1466 No power

                            all 3,324V

                            Comment

                            • mon2
                              Badcaps Legend
                              • Dec 2019
                              • 14106
                              • Canada

                              #34
                              Re: Macbook A1466 No power

                              Confirm the low resistance paths for each SPI flash interface pin between master and U6100 slave device.
                              Attached Files

                              Comment

                              • dclass-pro
                                Senior Member
                                • Dec 2022
                                • 157
                                • Italy

                                #35
                                Re: Macbook A1466 No power

                                I already checked all resistors and they are correct

                                Comment

                                • dclass-pro
                                  Senior Member
                                  • Dec 2022
                                  • 157
                                  • Italy

                                  #36
                                  Re: Macbook A1466 No power

                                  I also checked the lines and there is continuity

                                  Comment

                                  • mon2
                                    Badcaps Legend
                                    • Dec 2019
                                    • 14106
                                    • Canada

                                    #37
                                    Re: Macbook A1466 No power

                                    What is the voltage to ground of SMC_RESET_L ?

                                    Comment

                                    • dclass-pro
                                      Senior Member
                                      • Dec 2022
                                      • 157
                                      • Italy

                                      #38
                                      Re: Macbook A1466 No power

                                      3.3V fixed

                                      Comment

                                      • mon2
                                        Badcaps Legend
                                        • Dec 2019
                                        • 14106
                                        • Canada

                                        #39
                                        Re: Macbook A1466 No power

                                        Check if you have U2071 onboard (SC-70 single AND gate).

                                        If yes, measure the voltage to ground of pin 1, 2, 4, 5.

                                        List each measurement.
                                        Attached Files

                                        Comment

                                        • dclass-pro
                                          Senior Member
                                          • Dec 2022
                                          • 157
                                          • Italy

                                          #40
                                          Re: Macbook A1466 No power

                                          not have U2071 onboard

                                          Comment

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