Announcement

Collapse
No announcement yet.

820-02020 keyboard trackpad not functioning

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #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
    #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.
    #3
    Originally posted by kingskie View Post
    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

      #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

        #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

          #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

            #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

            Previous template Next
            Working...
            X