macbook pro A1728 cant charge battery

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  • alihomee
    Badcaps Legend
    • Dec 2012
    • 1574
    • malaysia

    #21
    Re: macbook pro A1728 cant charge battery

    did any body solve this issue

    Comment

    • keeney123
      Lauren
      • Sep 2014
      • 2536
      • United States

      #22
      Re: macbook pro A1728 cant charge battery

      Originally posted by alihomee
      did any body solve this issue
      As I have said, I have not seen a problem like yours were the 12 volts keeps cycling from 0 to 12 volts. Usually when a problem happens the software just stops the machine from running. That is why I wonder if this is not a software problem? What ever the case may be dellxps15 has experience with these machines. You might want to follow his instructions.

      Comment

      • alihomee
        Badcaps Legend
        • Dec 2012
        • 1574
        • malaysia

        #23
        Re: macbook pro A1728 cant charge battery

        may be u have not seen this problem before but i am experiencing this for second time ...normally this issue as i stated can solve by changing charging ic but this time i unable to solve it

        Comment

        • keeney123
          Lauren
          • Sep 2014
          • 2536
          • United States

          #24
          Re: macbook pro A1728 cant charge battery

          Originally posted by alihomee
          may be u have not seen this problem before but i am experiencing this for second time ...normally this issue as i stated can solve by changing charging ic but this time i unable to solve it
          It would seem odd to me that the 12 volts is cycling from 0Volt to 12 Volts every two seconds. I do not have the schematic for this board. I would concentrate on what the 12 volts turns on and try and determine what 12 volt device on the board is not turning on.

          Comment

          • jakkal
            New Member
            • Jan 2015
            • 8
            • Portugal

            #25
            Re: macbook pro A1728 cant charge battery

            try this schematic
            Attached Files

            Comment

            • jakkal
              New Member
              • Jan 2015
              • 8
              • Portugal

              #26
              Re: macbook pro A1728 cant charge battery

              check data line resistors between SMC and battery.

              Comment

              • keeney123
                Lauren
                • Sep 2014
                • 2536
                • United States

                #27
                Re: macbook pro A1728 cant charge battery

                Originally posted by alihomee
                on fuse 12v but volts are going to 0v and again coming to 12v after every 2 seconds

                So you have measured both sides of the fuse? Is this measurement with battery in or out? Also check for voltage on F9700 and anywhere that 12 volt line goes just to make sure it is going there. Also check SMC_RESET_L to see if it goes high. All measurements need to be done at the end of the line. Looking at page 3 this will show you where they go. If you find one not working then you trace backwards.
                Last edited by keeney123; 10-09-2016, 01:59 PM.

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