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[SOLVED] 820-4924 keyboard not working except for power button

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  • [SOLVED] 820-4924 keyboard not working except for power button

    I have this machine that doesn't appear to have liquid damage but one indicator stick next to the lcd connector was slightly red and peeled off. Besides that I don't see any liquid damage or corrosion anywhere. All the probe points are gold and look normal.
    I am able to power the machine on and shut it down with the keyboard but I am not able to type anything with the keyboard. I plugged in another new keyboard I have and still the same issue. The caps lock button doesn't work nor does holding the option key on startup.

    I checked for continuity on the keyboard connector pins to the probe points above it and they all had continuity.
    The other side of the keyboard connector is spotless and I checked continuity from the probe points(Pins 1-3) on that side to the ones on the kbd connector side and they had continuity.
    Here are some voltages of the connector with just my new keyboard plugged in.
    1/2/3-0v
    4/5 - 3.4v
    pin 6 around 1v
    Pin 13 - 0.77
    Pin 14 - 2.3v
    Pin 30 - 3.33v
    Last edited by larossmann; 05-25-2017, 12:14 AM.

  • #2
    Bad trackpad cable.

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    • #3
      Thanks duke. The trackpad cable was actually fine. The trackpad board had some liquid damage on it so I replaced the trackpad and now everything is working.
      Solved.

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