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Macbook A2338 - Ripped off Trackpad Posts - No Keyboard/Trackpad function

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  • silver60618
    Member
    • May 2021
    • 49
    • United States
    #1

    Macbook A2338 - Ripped off Trackpad Posts - No Keyboard/Trackpad function

    Hi gang, I was hoping someone could help me. Im working on a A2338 Macbook, with torn off standoff posts for the connectors shield. The laptop works, but gets no trackpad/keyboard/haptic functions.

    It looks like it just sits on a ground plane. The PPBUS_AON Pins are recieving 12v, pp3v3 present. I dont see any traces going to these pads or near vicinity.

    Any ideas what I can check? Any help would be appreciated.
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    • reformatt
      Badcaps Legend
      • Feb 2020
      • 1703
      • Australia
      #2
      Assuming you have tried another cable/trackpad then check diode values on each pin of JT400 and compare them against the Openboarddatavalues for the 820-02020 motherboard.

      My assumption is some one likely stripped the screws for the trackpad bracket during a battery replacement and just pulled the whole thing off instead.

        Comment

        • silver60618
          Member
          • May 2021
          • 49
          • United States
          #3
          Thanks. It turns out there are lines underneat the standoffs, that need to be grounded. I ran wire from the ground plane to a ground point, and all working now.

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