macbook pro 820-3462 charges very slowly

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  • donnos
    Member
    • Sep 2016
    • 11
    • Malaysia
    #1

    macbook pro 820-3462 charges very slowly

    Received a macbook pro which in notification shows 7 or 10 hours until full during charging.

    have replaced ISL6259 and Q7055 and still getting same results. current sensing resistors measured fine @ 0 and 2ohms. what else could be the issue?
    without battery i get 12.58V. i have physically shorted Q7055 drain to source to rule out issue with the mosfet and can confirm its still the same. any suggestions?

    when i shutdown it charges at only 16.5v 0.5A. during boot PSU draws 2.5-3A suggesting it momentarily charges but drops to 1.5A power draw after boot.
    Last edited by donnos; 06-03-2023, 02:28 PM. Reason: adding information
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14030
      • Canada
      #2
      Re: macbook pro 820-3462 charges very slowly

      Confirm the voltage to ground of:

      SMBUS_BATT_SCL
      SMBUS_BATT_SDA

        Comment

        • donnos
          Member
          • Sep 2016
          • 11
          • Malaysia
          #3
          Re: macbook pro 820-3462 charges very slowly

          both Diode reading are 0.4 red on ground

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14030
              • Canada
              #4
              Re: macbook pro 820-3462 charges very slowly

              Ok. Post the DC voltage to ground of the same. Meter in DC volts mode (10v or higher is ok). Wanting to confirm the SMBUS lines for this segment are ok.

              Also, remove all power and meter in resistance mode.

              Measure directly at U7000 pins for the resistance between CSOP and CSON. Had this exact case last year and it took ~3 weeks to resolve. The fault was that the current sense loop was broken. The fault was only caught after a direct probe at the U7000 IC pins.

              It is important to check that this current sense loop is ~2 ohms (pin 17 & 18 of U7000).
              Last edited by mon2; 06-03-2023, 06:16 PM.

                Comment

                • donnos
                  Member
                  • Sep 2016
                  • 11
                  • Malaysia
                  #5
                  Re: macbook pro 820-3462 charges very slowly

                  SMBUS lines are 3.34v

                  CSON to CSOP resistance is 3ohms.

                    Comment

                    • donnos
                      Member
                      • Sep 2016
                      • 11
                      • Malaysia
                      #6
                      Re: macbook pro 820-3462 charges very slowly

                      issue resolved by replacing SMC

                        Comment

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