MacBook Pro M1 2021 A2442 Touch ID stopped working

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  • Gigabit2
    Badcaps Veteran
    • Apr 2022
    • 264
    • United Kingdom
    #1

    MacBook Pro M1 2021 A2442 Touch ID stopped working

    I replaced the audio board in this laptop and everything is functioning except Touch ID which no longer works. Neither Touch ID is detected nor the button itself works, so it does not turn on or off the computer or sleep etc.

    How can I troubleshoot the cause?
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14039
      • Canada
      #2
      Re: MacBook Pro M1 2021 A2442 Touch ID stopped working

      From a quick review of the schematic, the TOUCH ID appears to be a SPI interfaced device. Check the connection of each SPI pin - appears to have 22 ohm resistors between each such line.

      Confirm the resistors are not defective.

      Check the voltage to ground of each such SPI connection.

      SPI_TOUCHID_MOSI
      SPI_TOUCHID_CLK
      SPI_TOUCHID_CLK_1V8
      SPI_TOUCHID_CLK_1V8_CONN
      SPI_TOUCHID_MOSI_1V8_CONN
      SPI_TOUCHID_MISO_1V8_CONN
      SPI_TOUCHID_MOSI_1V8_CONN
      SPI_TOUCHID_MOSI_1V8
      SPI_TOUCHID_MISO
      TOUCHID_BOOST_EN_CONN
      TOUCHID_BOOST_EN

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