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820-3462 Liquid damage, got power back, no green light.

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  • 820-3462 Liquid damage, got power back, no green light.

    Hi guys,

    I have an 820-3462 that has been liquid damaged.

    Initially it was DOA.

    R6920 looked burnt so I replaced it and it burnt out again.
    Made me look further along. R5081 and R4902 were shorted so I replaced these.

    It now turns on and gives a picture but fans are on full and no green light. I think the PCH is getting hot but am not sure what the usual operating temp for this is. I don't fix many newer MBPs.

    I swapped out R7010, as it was reading low, but now the new resistor is reading low too, so there must be a short near by...


    Everything seems to measure okay, but I just wanted to describe this behaviour I haven't seen before..

    If I plug the charger into my laptop, it goes green. Plug it into the 820-3462, and it goes green.

    Plug the power into my laptop again and the light goes orange (mines a little flat now), plug it into the 820-3462 and it goes orange. :|

    It seems the light does whatever it was doing last. :/

    Any ideas?

  • #2
    Disconnect keyboard and try again.

    Comment


    • #3
      Originally posted by dukefawks View Post
      Disconnect keyboard and try again.
      No keyboard was connected at the time.

      Comment


      • #4
        Read again.

        Comment


        • #5
          Read what again, there was no keyboard connected at the time.

          Comment


          • #6
            Oh, I read that is was connected, sorry.
            Is ACOK present? Is SMC_ONOFF present?

            Comment


            • #7
              No worries.

              SMC_BC_ACOK: 3.389
              SMC_ONOFF_L: 3.42

              It boots and feels okay to use, except it never sees the battery.

              Comment


              • #8
                Looks like an SMC issue to me.

                Comment


                • #9
                  I'm interested in how you reached that conclusion with so little info?


                  Comment


                  • #10
                    Experience.
                    Also resistors don't short. Something went wrong on 3V42 bus, so SMC is 1st suspect now.

                    Comment


                    • #11
                      Now I understand your keyboard comment from earlier!

                      Comment


                      • #12
                        Keyboard was just to rule out a stuck power button putting the SMC in bypass mode.

                        Comment


                        • #13
                          Originally posted by dukefawks View Post
                          Keyboard was just to rule out a stuck power button putting the SMC in bypass mode.
                          Yeh, I realised that after I looking at the SMC_ONOFF_L in more detail.

                          Comment


                          • #14
                            If I have SMC_BC_ACOK why would there be no green light?

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                            • #15
                              Just do the SMC

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