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820-3209-a power on only without u7000

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    #41
    Re: 820-3209-a power on only without u7000

    Can it be PCH issue as the earlier technician seems to have virtually fried the PCH.

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      #42
      Re: 820-3209-a power on only without u7000

      Is your multimeter accurate? SMC_RESET_L should be closer to 3.42V, check both sides of R5000 to make sure this is not an issue of the SMC reset circuit.
      PPBUS_G3H should be either 8.26V or 8.56V (with some margin, but not exactly 8.40V).
      Make sure your multimeter isn't too far off and that it has good batteries in it.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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        #43
        Re: 820-3209-a power on only without u7000

        It shouldn't be a PCH issue as the green light is not dependent on PCH. However, if there is something wrong with the PCH, the SMC may get confused or it may pull some rails down.
        If the PCH is really fried, not point in working on this board any further, except if you really want to replace a PCH *and* try to fix the other issues…
        OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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          #44
          Re: 820-3209-a power on only without u7000

          Originally posted by piernov View Post
          It shouldn't be a PCH issue as the green light is not dependent on PCH. However, if there is something wrong with the PCH, the SMC may get confused or it may pull some rails down.
          If the PCH is really fried, not point in working on this board any further, except if you really want to replace a PCH *and* try to fix the other issues…
          After some hard work, I got the freen light on magsafe. Now mb switches with GFX core missing. Flashed a known good bios . Still gfx core missing. Checked vcore circuit and nothing wrong there. Giving up on this as i suspect PCH is damaged due to excessive heat apllied from hot air gun.

          Thanks piernov for advice.

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            #45
            Re: 820-3209-a power on only without u7000

            You could still check if you have CPU reset signal present. And try PRAM reset and check if you have any chime/beeps.
            OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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              #46
              Re: 820-3209-a power on only without u7000

              Originally posted by piernov View Post
              You could still check if you have CPU reset signal present. And try PRAM reset and check if you have any chime/beeps.
              I tried smc reset as well as Pram reset. Didnt checked Cpu reset however. Anyway, client took it back

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