Macbook Pro - stuck in 5V after replacing CD3217

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  • ongobongo
    Senior Member
    • May 2023
    • 58
    • Germany

    #1

    Macbook Pro - stuck in 5V after replacing CD3217

    HI all,

    new member here, so hi to the community.
    I have a problem with a MacBook pro 13", A2251, board 820-01949, that is nagging me.
    The macbook had liquid spill and didn't work at all when i received it.
    I was able to get it back working by replacing a shorted cpu mosfet and a resistor on that line.
    It worked good after that with one fault: 3 usb ports worked as expected, one port didn't work at all, no voltage draw, nothing.
    The USB-on-board connector and the small usb-board of that port where both defective, so I replaced the on-board connector and used a new usb-board.
    Result was the same, 3 working ports, one completely dead.
    So I tried the next thing that came to mind, replaced the CD3217B12 connected to the faulty port, U3100_W in my case.
    Unfortunately, since then, the board doesn't work at all.
    The 3 usb-ports that worked before only draw 5V and the port that was dead before is still completely dead.
    I replaced CD3217 2 more times, with chips from different sellers, but still the same.
    I checked the resistors/capacitors around the area but couldn't find a suspicious reading.
    I thought about changing ISL9240 but the area looks clean with no obvious defects.
    Does anyone here has an idea where i should look at or what might be the problem?

    Thanks a lot
    Ongo
  • vla9imir
    New Member
    • Apr 2022
    • 5
    • USA

    #2
    Re: Macbook Pro - stuck in 5V after replacing CD3217

    on these boards, when replacing cd3217, you need to remove another chip from exactly the same board 820-01949-A, cd3217 from other macbook models will not work

    Comment

    • xloomx
      Member
      • Oct 2020
      • 49
      • Argentina

      #3
      Originally posted by vla9imir
      Re: Macbook Pro - stuck in 5V after replacing CD3217

      on these boards, when replacing cd3217, you need to remove another chip from exactly the same board 820-01949-A, cd3217 from other macbook models will not work
      And why is that? the GPIO are programables by apple?
      Thanks!

      Comment

      • mon2
        Badcaps Legend
        • Dec 2019
        • 14062
        • Canada

        #4
        the GPIO are programables by apple?
        Customized versions of the power delivery controller created for Apple by Texas Instruments. Customization can be pinout / firmware, etc. Suggest to follow the guidelines the research conducted by other techs else the repair will fail.

        Comment

        • xloomx
          Member
          • Oct 2020
          • 49
          • Argentina

          #5
          Originally posted by mon2

          Customized versions of the power delivery controller created for Apple by Texas Instruments. Customization can be pinout / firmware, etc. Suggest to follow the guidelines the research conducted by other techs else the repair will fail.
          Thanks!

          Comment

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