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

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    #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!!!
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    #2
    Re: Macbook 820-3115 b need urgent help - keyboad & trackpad issue

    Anyone? Any suggestions?
    Thanks!

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      #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

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        #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!

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          #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?

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            #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

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              #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

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