Macbook 820-3115 b need urgent help - keyboad & trackpad issue

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  • justin35
    Senior Member
    • Jan 2019
    • 149
    • It
    #1

    Macbook 820-3115 b need urgent help - keyboad & trackpad issue

    I can t remember what was the original problem with this board, but i assume it wasn't powering on...
    Once i got it working, passed asd test but left option shift and fn wasn't working so i replaced u5750.
    It worked like a charm for 2 days the suddenly no keyboad or trackpad and fan on high speed.
    I changed Q7800 as the output was 1.7v instead of 3.3v...
    Again it worked for 1-2 days without problems, then q7800 died again.....
    Replaced and worked fine untill today (1-2 weeks) when the custommer said no keyboad and trackpad AGAIN!!!
    I assume is q7800 is dead again...
    Any ideea what can cause this filthy failure?

    Thanks a million!!!
    Tags: None
    • justin35
      Senior Member
      • Jan 2019
      • 149
      • It
      #2
      Re: Macbook 820-3115 b need urgent help - keyboad & trackpad issue

      Anyone? Any suggestions?
      Thanks!

        Comment

        • piernov
          Super Moderator
          • Jan 2016
          • 4435
          • France
          #3
          Re: Macbook 820-3115 b need urgent help - keyboad & trackpad issue

          What is the resistance to ground on PP3V3_S4? If Q7800 dies, it's probably due to something pulling too much current on its output… Maybe a half-dead touchpad? Or Airport card?
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

            Comment

            • justin35
              Senior Member
              • Jan 2019
              • 149
              • It
              #4
              Re: Macbook 820-3115 b need urgent help - keyboad & trackpad issue

              I have no ideea what causes this problem or which is the resistance to ground on p03ve_s4 as i sent back the laptop to it's owner.
              I have replaced q7800 and replaced trackpad and wifi/bt card.
              Custommer told me sometimes when you power on laptop trackpad was not working for 1-2 minutes, and machine was trying to search for a bt mouse. He had to disable bluetooth in order to avoid this situation.
              I think(hope) it was a faulty trackpad...
              I'll get back to this thread if the problem occurs again.

              Thank you piernov!

                Comment

                • justin35
                  Senior Member
                  • Jan 2019
                  • 149
                  • It
                  #5
                  Re: Macbook 820-3115 b need urgent help - keyboad & trackpad issue

                  Well... laptop is comming back again... same problem...
                  Could a bad kayboard cause this?

                    Comment

                    • piernov
                      Super Moderator
                      • Jan 2016
                      • 4435
                      • France
                      #6
                      Re: Macbook 820-3115 b need urgent help - keyboad & trackpad issue

                      Uh...
                      No idea, maybe? PP3V3_S4 goes to the keyboard connector too apparently.
                      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                        Comment

                        • justin35
                          Senior Member
                          • Jan 2019
                          • 149
                          • It
                          #7
                          Re: Macbook 820-3115 b need urgent help - keyboad & trackpad issue

                          ... i will change keyboard but it's improbable to fix this issue...
                          I am thinking to replace keyboard controller too, if keyboard doesn't fix it

                            Comment

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