Apple A1708 charging problem

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  • Jacksoft
    Member
    • Feb 2011
    • 36
    • Italy
    #1

    Apple A1708 charging problem

    Hi all,
    we have a MacBook Pro A1708 with board 820-00840-A that initially had U3200 (one of the CD3215C00) in short. We replaced both and now on one Type-C port charger goes up to 20V and on the battery pin the we have about 12V, but on the other port the charge is stuck to 5V with no PP3V3_G3H (that's strange). Already checked resistors and capacitors solder and all seems ok.
    We found that when, on the other port, the voltage goes up to 20V this value is present on both U3100 and U3200 caps (C3101 and C3201) that should not (am I right?), so Q3100 or Q3200 is in short (we still have to check which one).
    Before starting to investigate the 5V problem we want to replace the two mosfet.
    Since FDPC4044 (found on schematic PDF) mosfet aren't available anymore on the market is there any alternative? Or we are stuck to find a dead motherboard to pick components from or buying something from Aliexpress?

    Any tip for the 5V in case, after replacing the mosfet, still persist?
    Remember, works good on one port (PP3V3_G3H 3.4V ok, 20V ok), but not on the second (Both ports looks pretty good, there's a way to test them?).

    Thanks!
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14659
      • Canada
      #2
      Re: Apple A1708 charging problem

      Check the LDO rails on each non working cd3215 ace controller.

      Also review the how to reach 20v article by @Piernov and gang on logiwiki. The flow chart is posted there.

      Update this thread as you troubleshoot.

        Comment

        • Jacksoft
          Member
          • Feb 2011
          • 36
          • Italy
          #3
          Re: Apple A1708 charging problem

          Thank you. I'll let you know what we've discovered.

            Comment

            • Jacksoft
              Member
              • Feb 2011
              • 36
              • Italy
              #4
              Re: Apple A1708 charging problem

              Hi,
              while we wait the new mosfet I've made some measurement by looking at steps on logi.wiki (CD3215 Bootup Sequence), and it fails at step 3.
              HV_GATE1 = 1.7V
              HV_GATE2 = 5V
              PPDCIN_G3H = 1.6V
              TBA_VDDA = 0V
              PM_EN_P3V3_G3H = 0.4V

              I've not continued in measuring, since this fails.
              We removed the mosfet and the HV_GATE1 and 2 are respectively 6V and 11V.

              In the attached picture there is the port that can't reach the 20V status.
              Attached Files

                Comment

                • Jacksoft
                  Member
                  • Feb 2011
                  • 36
                  • Italy
                  #5
                  Re: Apple A1708 charging problem

                  The new MOSFET has been arrived and replaced the old one and the Mac now goes on 20V on both ports, charges and powers on!

                    Comment

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