Lenovo ThinkPad T540p not charging

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  • kissa123
    New Member
    • Jan 2025
    • 3
    • Finland

    #1

    Lenovo ThinkPad T540p not charging

    So i got a T540p with LKM-1 SWG2 12308-2 48.4LO18.021 that will not charge the battery.
    It runs fine with AC plugged in with or without battery, also runs fine with a charged battery, but will not recharge it.
  • mon2
    Badcaps Legend
    • Dec 2019
    • 13984
    • Canada

    #2
    https://www.badcaps.net/forum/troubl...arging-circuit

    Comment

    • kissa123
      New Member
      • Jan 2025
      • 3
      • Finland

      #3
      I had a look at that before making the post but i just got really confused, i looked at it again and i think it helped me find the culprit, should have been more patient.

      It seems that Q13 MOSFET Source and Gate are shorted. I tested resistance on Q9, Q36, Q13 and Q34. Everything was above 15kohms except Q13 S-G which was showing 1 ohm.
      Now my next question would be is there anything else i need to look for or would my issue be fixed by getting the Q13 mosfet replaced?

      Comment

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