Macbook Pro 14 2021 - A2442 - 820-02098-A not turning on 5v fluctuation

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  • Rickkap
    Senior Member
    • Aug 2015
    • 123
    • UK
    #1

    Macbook Pro 14 2021 - A2442 - 820-02098-A not turning on 5v fluctuation

    I would like some help with this MacBook if possible. It came in with not turning on and the Magsafe light was off. After inspecting the logicboard i cannot find any liquid damage and also no burnt or shorted components.
    took some measurement and i can see i have fluctuation on PP3V3_S2 and also PP5V_S2_MAIN amongst other rails. Using the thermal camera RC282 & RC283 were pulsing, but after removing these it was still the same.

    I then did some investigation into why the rails were pulsing and noticed that P5VS2_PWR_EN (comes from U8100) is also doing the same thing.. Replaced both U8100 and also U7700 from a working (iCloud locked) logicboard, still the same. I've also temporarily removed all the components on the PP3V3_S2 rail but the fluctuation is still there so i'm thinking that it could be coming from a higher rail. I'n not sure what the power rail startup sequence is on this model. All the AON rails are fine and stable and now i've hit a wall and not sure what to do next.
    Tags: None
    • Rickkap
      Senior Member
      • Aug 2015
      • 123
      • UK
      #2
      Anybody willing to help!!!

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 13834
          • Canada
          #3
          Check the frequency of MPMU_XTAL2 and MPMU_XTAL_R.

            Comment

            • spidertnt
              Member
              • Jul 2016
              • 34
              • Canada
              #4
              https://www.badcaps.net/forum/troubl...no-power-a2779

              sometimes failed caps repeat ...worth a check

                Comment

                • Rickkap
                  Senior Member
                  • Aug 2015
                  • 123
                  • UK
                  #5
                  Click image for larger version Name: 17320307096611825669491477237956.jpg Views: 0 Size: 1.28 MB ID: 3510653
                  Originally posted by mon2
                  Check the frequency of MPMU_XTAL2 and MPMU_XTAL_R.
                  32Khz and stable on both sides of R8350

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13834
                      • Canada
                      #6
                      What is the voltage and current draw of the USB Type C meter?

                        Comment

                        • Rickkap
                          Senior Member
                          • Aug 2015
                          • 123
                          • UK
                          #7
                          It's 5.18v current draw fluctuates between 0.00 and 0.05A and that's on all 4 ports

                            Comment

                            • mon2
                              Badcaps Legend
                              • Dec 2019
                              • 13834
                              • Canada
                              #8
                              Each PD controller is a suspect. Confirm the LDO rail of each controller - much like the CD3215 article:

                              https://logi.wiki/index.php/CD3215_Bootup_Sequence

                              The BMC 1v1 will only be active for the USB C port being used to power the board.

                                Comment

                                • Rickkap
                                  Senior Member
                                  • Aug 2015
                                  • 123
                                  • UK
                                  #9
                                  My understanding is that these boards don't have the T2 and are not similar to the CD3215. I took it upon myself to swop from an icloud locked board, all 4 CD3217 in the correct order along with the ROM's as explained on this page https://logi.wiki/index.php/CD3217_a...er_on_Sequence and it is still fluctuating.

                                  I've spent enough time on this now so it's become another donor or until someone else gets and fixes the same issue.

                                    Comment

                                    • mon2
                                      Badcaps Legend
                                      • Dec 2019
                                      • 13834
                                      • Canada
                                      #10
                                      https://boards.rossmanngroup.com/thr...acement.64959/

                                        Comment

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