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820-3437 quick question about keyboard trackpad

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  • 820-3437 quick question about keyboard trackpad

    Just want to double check something. Currently waiting for trackpad flex cable to be delivered next week as i've run out
    Have a macbook here for liquid damage fixed everything it seems, was dead. but keyboard and trackpad doesn't work only afer boot. it works beforehand. that's the cable right?

  • #2
    Could be cable, trackpad, or keyboard. If cable was corroded, depends which end was corroded.

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    • #3
      Before OSX (i.e. Boot Menu), trackpad/keyboard work through USB way.
      Once logged into OSX, SPI communication is enabled.

      Try first known good working trackpad board/flex.
      If still not working into OSX, checl all traces and resistors SPI related.
      Also check I/O signals for U4810.

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