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820-3437 No TP/KB

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  • 820-3437 No TP/KB

    Hi. I have a 820-3437 with no Trackpad/Keyboard in Operating System except for power button. Both keyboard and trackpad will work pre - O.S. External KB/Mouse will work fine. Have tried with multiple Operating Systems. Thank you. Have a good one.

  • #2
    Check SPI lines on trackpad connector an resistors R4850 to R4853.....

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    • #3
      Hi. Thank you.

      pn 2 - 0
      pn 7 - Jumps everywhere between .015 - .005
      pn 9 - .003
      pn 11, 12, 13 - Jumps everywehere between 3.3 - 2.7

      R4850 33.8 Ohm
      R4853 33.8 Ohm

      Thanks again.
      Last edited by RyanLEN; 08-25-2017, 02:16 PM.

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      • #4
        I mean R4850, R4851, R4852 and R4853......

        This is water damage??? Inpect for corrosion on connector, trackpad side and LB side....

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        • #5
          R4851 and R4852 are within 33 Ohms as well.

          Areas are pretty clean. Aside from discoloration on via's. https://goo.gl/photos/qHkf4st1zWA4fJaW6

          Thanks.

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          • #6
            Put back together. It seems to be working again.

            pn 2 - 0
            pn 7 - 0
            pn 9 - .003
            pn 11 - 3.297
            pn 12 - 3.326
            pn 13 - 3.309



            Last edited by RyanLEN; 08-25-2017, 03:57 PM.

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            • #7
              The usual bad TP cable/corrosion in the connectors.

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