Lenovo ThinkPad T14 gen1 charging problem

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  • tmks2
    Member
    • Oct 2020
    • 12
    • EU

    #1

    Lenovo ThinkPad T14 gen1 charging problem

    I have a think pad t14 gen1, mainboardboard NM-C931 REV 1.0, I replaced the damaged USB-C charging socket, I still have a problem with charging only 5V. Where to look for the fault? Which electronic component is responsible for charging negotiation?

    here is schematics an boardview
    https://www.badcaps.net/forum/troubl...98#post1768898
  • mon2
    Badcaps Legend
    • Dec 2019
    • 14549
    • Canada

    #2
    USB type C is with power delivery. Power delivery will use the cc1 and cc2 pins for communication. The pd controller is the think engine 3 chip on this Lenovo.

    Comment

    • tmks2
      Member
      • Oct 2020
      • 12
      • EU

      #3
      Power delivery TPS65988, this chip may be damaged? is it a programmable chip?

      Comment

      • mon2
        Badcaps Legend
        • Dec 2019
        • 14549
        • Canada

        #4
        It is but is configured by an external I2C host or SPI external flash at run / boot time.

        Comment

        • tmks2
          Member
          • Oct 2020
          • 12
          • EU

          #5
          I replaced the Power delivery TPS65988, charging still 5V, where to look for the problem?

          Comment

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