A2179 fast fan and extremely laggy touchpad :'(

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  • Darren Hibbert
    Senior Member
    • Feb 2024
    • 114
    • UK
    #1

    A2179 fast fan and extremely laggy touchpad :'(

    I just changed the screen on a Macbook A2179.

    On restart, it boots up to the password screen but any movement on the touchpad is extremely laggy and the fan spins up to full speed.

    I tried checking all the connectors which are all in place.
    New thermal paste on CPU.

    Also noticed the battery is not charging either and shows a battery sign in the top right hand corner with an exclamation mark in it.

    I have schematic and boardview if anyone can help me with this?

    Many thanks.
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14316
      • Canada
      #2
      You are missing the enumeration of some sensor that is leading to the high Charles Manson crazy fan spin & the cpu is being throttled.

      Suspecting that the issue is probably with the BMS cable of your battery pack. Post pictures of how you have inserted this cable into the BMS connector on the logic board. Respectively, if you disconnect this cable, do you see the same level of fan spin? Most likely this cable is not properly seated inside the connector. Start here.

        Comment

        • Darren Hibbert
          Senior Member
          • Feb 2024
          • 114
          • UK
          #3
          Hi.

          If I disconnect the battery cable, it does exactly the same. Unbelievably laggy and full blast fan.

          Interestingly I just found this video and believe this could be the solution. Apparently it's a particular quirk of this exact model.

          https://youtu.be/xT-frKkgxHc?si=D5XnEL8YHW_alS_S

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