Macbook A1708 battery not detected

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  • tommy97
    Senior Member
    • Mar 2023
    • 143
    • United Kingdom
    #1

    Macbook A1708 battery not detected

    Hi guys, i have weird problem with A1708, laptop does not detect battery, currently I'm using tested new battery, laptop works on it but does not show any details such as percentage, cycle counts etc. and works on it only for like 1-2 minutes with battery cross icon.

    I've tried new battery flex, no change.

    PPBUS_G3H 10.9v on battery
    D6950 - tested fine (replaced also just in case, no change)
    R5381 - 3.3V (2kOhm)
    R5380 - 3.3V (2kOhm)

    R6950 - 10kOhm - 0.08v or 0 (Checked path and fine with connector)
    On battery data connector 3.4v on pin 2&3

    Any ideas what can be done/checked?
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13830
      • Canada
      #2
      Re: Macbook A1708 battery not detected

      To confirm, the battery is known good and is charged yet the logic board is unable to remain on with this battery?

      Remove all power / no battery and confirm the resistance on each side of C7020. We are wanting to confirm the current sense loop resistor circuit to be sure it matches the schematic values.

      Confirm the resistance from the battery connector contacts to the SMBUS master @ U5000. Ideally, a scope or SMBUS / I2C analyzer is required to monitor the bus traffic between the slave / master devices. This will confirm if the battery is responding to the transactions. Assuming the battery is compatible for this logic board, then the SMBUS connections must be reviewed. The default parked state of logic '1' is good but does not confirm if the bus master is able to communicate with each device. That is, perhaps a broken connection before reaching the battery.

        Comment

        • tommy97
          Senior Member
          • Mar 2023
          • 143
          • United Kingdom
          #3
          Re: Macbook A1708 battery not detected

          Pin 2 - OL 0
          Pin 1 keep changing from 5-25khm with drop

          I don't have a scope to test smbus

            Comment

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