MacBook Pro M1 2021 A2442 Touch ID stopped working

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • 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
      • 14693
      • 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

        Comment

        Previous template Next

        Related Topics

        Collapse
        • tyler_jones8209
          2021 M1 MacBook Pro (A2442/820-02098-A) Stopped Charging on All Ports
          by tyler_jones8209
          So my friends A2442 MacBook Pro stopped charging one day and hasn’t worked since. It wasn’t like an immediate shut off, like it worked until the battery died but now she can’t charge it so idk what to do with it.

          I don’t have an ammeter (yet it’s coming soon) so idk if it’s doing anything funky with current or voltage but I know it doesn’t charge on ANY of the ports.

          I took it down to the motherboard hoping to see an obviously bad component but everything looks good.

          I don’t have much experience with laptops, only consoles and controllers...
          10-28-2025, 04:54 PM
        • sdogs
          Macbook pro 13 A2442 820-02098 Touch ID doubt
          by sdogs
          I have a macbook pro 14.1 A2442 that has had contact with liquid, the affected area is the one near the touch id connector (see image). I carefully cleaned the affected area but the UT600 chip (LM3638A0) seems to be in poor condition and probably needs to be replaced.
          I searched online and found the replacement but it is indicated as a spare part for iphone 6 and 6 plus and at this point I had a doubt, does this chip have some type of programming?
          Forgive the question, I'm just an enthusiast but I had this doubt and before ordering the spare part I wanted to be sure I wasn't doing...
          09-24-2024, 02:36 AM
        • slimmy182
          MacBook M1 Pro 14" 2021 A2442 (820-02098) — U2020 getting hot, board not powering on
          by slimmy182
          Hi everyone,

          I have a MacBook Pro M1 14” (board 820-02098) with a broken LCD panel (matrix damaged).
          The board does not power on — when connected to power it draws about 5.1 V / 0.474 A (~2.45 W) and stays at that level, with no fan spin or display activity.
          Using a thermal camera, I noticed that U2020 heats up to over 70 °C shortly after connecting power.
          According to the schematic, U2020 is a SN74AVC2T45RSWR (Texas Instruments) 2-bit bidirectional level shifter.
          There are no visible signs of liquid damage anywhere on the board.
          Given the broken LCD,...
          3 Photos
          08-15-2025, 02:57 AM
        • Rickkap
          Macbook Pro 14 2021 - A2442 - 820-02098-A not turning on 5v fluctuation
          by Rickkap
          I would like some help with this MacBook if possible. It came in with not turning on and the Magsafe light was off. After inspecting the logicboard i cannot find any liquid damage and also no burnt or shorted components.
          took some measurement and i can see i have fluctuation on PP3V3_S2 and also PP5V_S2_MAIN amongst other rails. Using the thermal camera RC282 & RC283 were pulsing, but after removing these it was still the same.

          I then did some investigation into why the rails were pulsing and noticed that P5VS2_PWR_EN (comes from U8100) is also doing the same thing.....
          11-18-2024, 03:36 AM
        • rcanpolat
          M1 MacBook Pro 2021 A2485 - No backlight display
          by rcanpolat
          Hi all,

          I recently got my hands on an M1 MacBook Pro (2021, A2485) that I suspect suffered some liquid damage. I have a hot air station and the basic tools to work on the board, but I’m new to SMD repair and would love some guidance before diving in.

          Here’s what I’ve observed so far:
          • When I power it on, I hear the MacBook chime and, with a flashlight, I can see the Apple logo on the screen. However, it never completes the boot and eventually powers off. My plan is to try to get the display fully working first, then tackle the boot issue.
          • I did some basic resistor
          ...
          08-24-2025, 02:16 PM
        • Loading...
        • No more items.
        Working...