Macbook Pro 16" A2485, 820-02100, battery service recommended, fan full speed, doens't charge

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  • awe126
    New Member
    • Mar 2025
    • 3
    • Czechia
    #1

    Macbook Pro 16" A2485, 820-02100, battery service recommended, fan full speed, doens't charge

    Hello all,

    I bought a Macbook Pro 16" M1 Pro, A2485, 820-02100, which working flawlessly but not charging. I thought battery needs to be replaced but then started reading and it seems that problem will be in motherboard.
    Battery sign has cross sign and MacOS can't read battery stats. Fans are full speed but can be set down via Fancontrol software.
    I did start digging into in and found out below:

    Diode mode:
    SMBUS_BATT_SCL: 0.529
    SMBUS_BATT_SDA: 0

    SMBUS_BATT_SCL: 1.795V
    SMBUS_BATT_SDA: 0.948V

    Can anyone help me to continue in measuremets? I have no clue where to continue.

    Thanks ​
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13849
      • Canada
      #2
      Flux and carefully remove U5150 off the board.

      Repeat the diode mode testing. Post the measurements.

      The following measurements are contradictory.

      SMBUS_BATT_SDA: 0 ; diode mode
      SMBUS_BATT_SDA: 0.948V ; voltage mode

      If the diode mode shows a short then there should be no voltage at all in voltage mode due to the short condition.
      ​

      Click image for larger version Name: U5150.png Views: 0 Size: 69.7 KB ID: 3602596

        Comment

        • awe126
          New Member
          • Mar 2025
          • 3
          • Czechia
          #3
          I'm sorry for late response. I did remove U5150 but got same measurement. I discovered few spots of liquid damage near and around UD102.

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