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ANOTHER 820-4924 trackpad issue

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  • ANOTHER 820-4924 trackpad issue

    Hey guys.

    this one is fully working system but the trackpad fails - i tried a good working trackpad & keyboard it worked. After few restarts and sitting around for a bit NO trackpad again! It doesnt seem to have any corrosion oh water damage.

    im not sure what the best way to diagnose these issues.

    I have taken some voltages from around trackpad connector.

    pp5v_s4_tpad_f 5.19v
    pp3v3_s4 3.33v
    smc_lid 3.3v
    smc_pme_s4_wake_l 3.297v
    tpad_spi_if_en_conn 3.33v

    Where is good place to start looking?

  • #2
    Check if trackpad/keyboard always work on boot menu.
    I suppose you have an issue once logged into OSX.

    Inspect trackpad connector.
    Keyboard still working, only trackpad issue?

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    • #3
      yes i check once logged into osx. Actually no keyboard AND no trackpad
      i cant get into boot menu when i hold option? maybe coz keyboard also not working

      Comment


      • #4
        I assume you tried known good trackpad flex not just Tpad itself?

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        • #5
          yep i got a good working shell so i just transplant the logicboard to eliminate keyboard/trackpad issue.

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          • #6
            Didn't check PPVIN_S4_TPAD_FUSE?
            Is F4800 OK?

            Check U4910 area too.

            Comment


            • #7
              u4900 area look good. i tested resistors values around seem good. voltage 3.3 on 1, 5, 8

              Comment

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