T480 with GeForce MX150 - not charging, no reaction to power button

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  • sant1
    Member
    • May 2014
    • 11
    • Estonia
    #1

    T480 with GeForce MX150 - not charging, no reaction to power button

    Hello,

    MEC1653-BA1 pulled VCC3M down to 60ohm, replaced it, programmed with vertyanov, no reaction to on/off button and not charging now.
    Noticed that VSYS_OUT is 9.18V, had a opportunity to compare on UMA T480, it was 10.2V, no ideas if DGPU T480 should have same VSYS_OUT.​
    Tags: None
    • sant1
      Member
      • May 2014
      • 11
      • Estonia
      #2
      Measured all BQ25700 pins, everything seems quite identical, compared with working board, attached picture with measurements.Only 3 different readings, VSYS, BATDRV# and SRP/SRN.
      Tried swapping BQ25700 - same result.

      No idea where to go, im randomly swapping components.

        Comment

        • sant1
          Member
          • May 2014
          • 11
          • Estonia
          #3
          Forgot to add picture with the measurements. These measurements are without battery.
          1 Photo

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