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820-3435 keyboard trackpad only work in OS AND FAN RUNS IN FULL

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  • 820-3435 keyboard trackpad only work in OS AND FAN RUNS IN FULL

    Hello guys , please I need your help, have got a MacBook Air 11inch whose keyboard/trackpad will only work in OS and the keyboard fan runs in full speed.

    HISTORY : initially the machine would intermittently switch off , so I had to replace the SMC and it works except the issue above, so I thought maybe the SMC was not good so installed another one , but still the same.

  • #2
    Have you even tried a new trackpad/trackpad flex or at least inspected them for corrosion???

    Comment


    • MOMOH
      MOMOH commented
      Editing a comment
      yes, and still same thing , Sorry for my late response

  • #3
    Inspect USB_TPAD_P/N lines for corrosion.
    Post U4810 voltages before login to OSX; remove internal SSD to avoid system booting.
    If also fan runs always high, makes me thinking both problems could be generated by trackpad board/flex.
    Start trying known good ones.
    You can run corresponding ASD EFI version and see what error pops up.

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    • #4
      Thank you so much 2informaticos and John .. I will post the value you requested tomorrow , we are closed now .. I appreciate your help

      Comment


      • #5
        On U4810
        PIN 1 = 3.3V
        PIN 2 = 0V
        PIN 3 = 0V
        PIN 4 = 0V
        PIN 5 = 3.3V
        PIN 6 = 0V
        PIN 7 = 0V
        PIN 8 = 3.3V

        TPAD_SPI_IF_EN_CONN circles between 0v,1v,2v when the keyboard is not connected , but straight 0V after connecting the keyboard

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        • #6
          Also when I use an external keyboard trackpad it works in EFI

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          • #7
            Missing TPAD_USB_IF_EN signal at U4810; check diode mode to ground.

            I hope you measured with trackpad connected.

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            • #8
              Originally posted by 2informaticos View Post
              Missing TPAD_USB_IF_EN signal at U4810; check diode mode to ground.

              I hope you measured with trackpad connected.
              9Yes with trackpad connected, Diode mode to ground is OL

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              • #9
                Check R1619.
                If good, then is PCH issue.

                Please, do NOT quote an entire post visible few centimeters above.
                Maintain forum aesthetic...

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                • #10
                  Thank you so much , will also refrain from the above

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                  • #11
                    2informaticos Thank you so much, the machine worked , R1619 was 2.5V thank you everyone

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