Macbook Pro A1286 power on problem

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  • Simpletek
    Member
    • Mar 2011
    • 35
    • Italy
    #1

    Macbook Pro A1286 power on problem

    Hi all, i have an issue with this Macbook, MB code 820-2850

    Magsafe light always green, battery not charging, pressing power button nothing happend....

    tried smc bypass, not work

    take apart motherboard :

    tested voltage, magsafe connected 12v on PPBUS_G3H (all 12v rail) changes between 7v and 12v continuously

    only battery connected 12v ok but no power

    tried 16,5 volts from universal notebook adapter, soldered on ground and first fuse, 12v rail ok and not change but no power

    any ideas?? thanks
    Tags: None
    • spidey
      climbs
      • Dec 2012
      • 644
      • Cyprus
      #2
      Re: Macbook Pro A1286 power on problem

      is there any liquid trace under keyboard ?

        Comment

        • Simpletek
          Member
          • Mar 2011
          • 35
          • Italy
          #3
          Re: Macbook Pro A1286 power on problem

          Originally posted by spidey
          is there any liquid trace under keyboard ?
          No, MBP seems like new....

            Comment

            • xalu
              Member
              • Mar 2015
              • 37
              • United States
              #4
              Re: Macbook Pro A1286 power on problem

              Hi, I am also looking for the board view

                Comment

                • highpulse
                  i hate HP
                  • May 2013
                  • 1488
                  • portugal
                  #5
                  Re: Macbook Pro A1286 power on problem

                  chek with boardview , were to find SMC_ONOFF_L or SMC_ON_OFF_L
                  you will see ++3ghot power signal 3.42 volts
                  short with GND , it should turn on
                  reove keyboard , and remove battery , without battery macbook should turn on alone as well
                  if not , could be bad SMC or bad SMC contact
                  meanwhile here it is , BDV and schematic for the board you need
                  Attached Files

                    Comment

                    • MikkiG
                      New Member
                      • Feb 2016
                      • 2
                      • USA
                      #6
                      Re: Macbook Pro A1286 power on problem

                      Thanks for this!

                      Originally posted by highpulse
                      chek with boardview , were to find SMC_ONOFF_L or SMC_ON_OFF_L
                      you will see ++3ghot power signal 3.42 volts
                      short with GND , it should turn on
                      reove keyboard , and remove battery , without battery macbook should turn on alone as well
                      if not , could be bad SMC or bad SMC contact
                      meanwhile here it is , BDV and schematic for the board you need

                        Comment

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