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820-2915-b , pp3v3_s4 low voltage, no trackpad no keyboard error booting

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  • 820-2915-b , pp3v3_s4 low voltage, no trackpad no keyboard error booting

    hi, i got a 820-2915-b with a recently replaced gpu. the machine works fine but had previous light water damage on keyboard. replaced it but still no keyboard or trackpad,

    pp3v3_s4 is at 1.78v

    with or without trackpad/keyboard connected , measure 1.98Kohm to ground. what could cause this and how to solve it?

    (cannot locate q7800 on the board as there is nothing where the boardview says it should be)

  • #2
    embarassing. didn't see it was ALLL no stuff. solved the line replacing R7803, still no keyboard, no onoff button and the os gives a "unable to verify this machine" when i try to install it

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    • #3
      The operation could not be completed Nsurlerrordomain error - 1012

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      • #4
        Solved the OS problem flashing a new efi. Still no keyboard

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        • #5
          Trackpad also still not working?
          Power button has direct connection from keyboard to MLB.
          Doesn't pass through any strange circuitry...
          Remove keyboard an see if board turns on/off touching SMC_ONOFF_L to ground.
          Also check this signal level, does it go low with keyboard connected?
          Last edited by 2informaticos; 10-10-2018, 05:08 AM.

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          • #6
            solved. replacement keyboard was defective. machine works perfectly, you can close, thank you

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