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Inductor connected to charging IC is hot

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    Inductor connected to charging IC is hot

    Motherboard:
    15CBHPGT-6050A2628301-MB-A02

    Charging IC:
    BQ738 (BQ24738)

    While laptop is off and the battery is being charged, inductor L6000 is hot to touch. Can feel the heat radiating an inch or so above. Is this normal?
    Charging IC is a little warm to touch but not as hot as inductor L6000.
    Inductor cools after battery is done charging.

    Recently had MOSFETS Q6000, Q6001 replaced which fixed the battery not charging issue. Want to be sure there are no remaining bad components that need to be replaced.

    TIA
    Attached Files

    #2
    Re: Inductor connected to charging IC is hot

    Q6000/6001 were exact replacement as per schematics?? What is the resistance on coil L6000?

    Comment


      #3
      Re: Inductor connected to charging IC is hot

      Originally posted by mcplslg123 View Post
      Q6000/6001 were exact replacement as per schematics?? What is the resistance on coil L6000?
      Yes Q6000, Q6001 were exact replacements.

      My digital multimeter is jumping between 0.0, 0.1, 0.2 ohms.
      Spec sheet says it should be 35 - 40 milli ohms.
      I don't think my multimeter can measure such small resistance, so maybe the inductor is good.
      Can you confirm?

      Generally speaking, does the charging inductor get hot while charging battery?

      TIA
      Last edited by mobotest; 10-09-2020, 07:38 PM.

      Comment


        #4
        Re: Inductor connected to charging IC is hot

        Yes, charging inductor coil do gets hot depending on the charging circuit,battery capacity/cells as large amount of current passes thru that coil.

        Comment


          #5
          Re: Inductor connected to charging IC is hot

          Originally posted by mcplslg123 View Post
          Yes, charging inductor coil do gets hot depending on the charging circuit,battery capacity/cells as large amount of current passes thru that coil.
          Charging IC: BQ24738
          AC Adapter: 19.5V, 6.15A
          Battery: Original HP 6-cell battery, 10.8V, 47Wh
          HP Battery Check software reports 3.1A of current during battery charging.

          Although the battery is charging presently, I would like to fix any problems there may be that may show up later on.
          And reminder that Q6000, Q6001 were replaced to fix battery not charging issue.
          Is 3.1A sufficient to make the inductor hot?
          Is the inductor getting hot an indication of a short or faulty component somewhere on board?
          Last edited by mobotest; 10-13-2020, 05:24 PM.

          Comment


            #6
            Re: Inductor connected to charging IC is hot

            Bump

            Comment


              #7
              Re: Inductor connected to charging IC is hot

              like mcplslg123 said the inductor coil heats up specially if your battery is fully drain and eventually heat will decrease in the 60 to 70% battery capacity a short in the area will heat up the mosfet.
              Never stop LEARNING because life never stops TEACHING!

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