820-2936 B not turning on with adaptor.

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  • ikelectro
    Member
    • Aug 2013
    • 20
    • India
    #1

    820-2936 B not turning on with adaptor.

    Not turning on with adaptor but with battery the laptop is turning on,.
    And also battery is not charging. I changed the PU7000. PU7000 pin no 14 is 3.3V.
    now what should i check?
    GREEN LIGHT of mega Safe is there.
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #2
      Re: 820-2936 B not turning on with adaptor.

      Voltage on PPBUS_G3H with AC adapter only, battery disconnected?
      Voltage on PM_BATLOW_L with AC adapter only, battery disconnected?
      Resistance between pin 27 and 28 of U7000? Resistance between pins 17 and 18 of U7000?
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • smali
          Badcaps Veteran
          • Sep 2014
          • 287
          • Pakistan
          #3
          Re: 820-2936 B not turning on with adaptor.

          CHECK FIRST R6990(47 ohms) then D6990 double diods and also check F6905 and D7005.

            Comment

            • Akinovich
              New Member
              • Aug 2017
              • 8
              • The Netherlands
              #4
              Re: 820-2936 B not turning on with adaptor.

              Why should he check R6990, D6990 and F6905 if magsafe light is there. D7005 makes sense. Trying to learn am i missing anything?

              Resistance on R7020 like piernov said

              U7000
              voltage on pin 2, 3, 13

                Comment

                • smali
                  Badcaps Veteran
                  • Sep 2014
                  • 287
                  • Pakistan
                  #5
                  Re: 820-2936 B not turning on with adaptor.

                  Originally posted by Akinovich
                  Why should he check R6990, D6990 and F6905 if magsafe light is there. D7005 makes sense. Trying to learn am i missing anything?

                  Resistance on R7020 like piernov said

                  U7000
                  voltage on pin 2, 3, 13
                  yes you are right....i missed magsafe Green light part in the post....

                    Comment

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