820-02020 keyboard trackpad not functioning

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  • kingskie
    Badcaps Veteran
    • Oct 2014
    • 249
    • indonesia
    #1

    820-02020 keyboard trackpad not functioning

    hi all,

    i am working on macbook pro A2338 820-02020 can turn on but keyboard and trackpad not functioning.
    no sign of water damage.

    measurements:

    TPAD_KBD_WAKE_L = 1.78V
    KBD_INT_L = 1.8V
    SPI_TPAD_INT_CONN_L = 1.77V
    IPD_LID_OPEN_1V8 = 0V
    I2C_SMC_IPD_1V8_SCL = 1.79V
    I2C_KBD_SDA = 1.84V
    SPI_TPAD_MOSI_CONN = 0V

    IPD_LID_OPEN_1V8 = 1.8V when open lid
    anyone can help?
    Last edited by kingskie; 11-14-2023, 10:15 PM.
    Tags: None
    • kingskie
      Badcaps Veteran
      • Oct 2014
      • 249
      • indonesia
      #2
      Re: 820-02020 keyboard trackpad not functioning

      no external keyboard and mouse working either even in recovery mode.
      alredy change the touchpad cable but nothing happened

      can someone help?

        Comment

        • Pedro147
          #2.1
          Pedro147 commented
          01-08-2024, 05:35 AM
          Editing a comment
          As you may be aware, the keyboard/ track pad communicate using the USB protocol prior to login and in recovery. They then switch to SPI communication after login. Therefore I would be look at the data function of the USB ports. If you have any sort ot drive with a data activity LED, you can see if there is any activity on the ports data wise.
        • JPonce
          New Member
          • Nov 2022
          • 2
          • Mexico
          #3
          Originally posted by kingskie
          hi all,

          i am working on macbook pro A2338 820-02020 can turn on but keyboard and trackpad not functioning.
          no sign of water damage.

          measurements:

          TPAD_KBD_WAKE_L = 1.78V
          KBD_INT_L = 1.8V
          SPI_TPAD_INT_CONN_L = 1.77V
          IPD_LID_OPEN_1V8 = 0V
          I2C_SMC_IPD_1V8_SCL = 1.79V
          I2C_KBD_SDA = 1.84V
          SPI_TPAD_MOSI_CONN = 0V

          IPD_LID_OPEN_1V8 = 1.8V when open lid
          anyone can help?
          Did You resolver your problem ? I'm dealing the same fault

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13917
              • Canada
              #4
              What is the history of your machine? Liquid damage? Post pics of the cables of these parts. Test with an external keyboard & mouse. They work?

                Comment

                • reformatt
                  Badcaps Legend
                  • Feb 2020
                  • 1400
                  • Australia
                  #5
                  Try another trackpad first. Keyboards on MAC's don't work without a functional trackpad. Remove and examine trackpad for liquid damage etc as this is a common fault.

                    Comment

                    • JPonce
                      New Member
                      • Nov 2022
                      • 2
                      • Mexico
                      #6
                      On My case i replace keyboard and trackpad with a known working ones. And i have same lectures as kingskie. Thanks for the reply

                        Comment

                        • reformatt
                          Badcaps Legend
                          • Feb 2020
                          • 1400
                          • Australia
                          #7
                          Examine JT400 connector and it's associated flex cable pins for damage under the microscope. Check diode values using the values from OpenBoardData for the connector.

                          Review voltages on JT400 connector

                          PPBUS_AON
                          PP5V_S2_TPAD_CONN
                          PP1V85_S2_ISNS
                          PP3V3__S2_TPAD_ISNS
                          etc

                            Comment

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