Inductor connected to charging IC is hot

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  • mobotest
    Member
    • Mar 2020
    • 26
    • US
    #1

    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
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    • mcplslg123
      Badcaps Legend
      • Jun 2015
      • 7262
      • india
      #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

        • mobotest
          Member
          • Mar 2020
          • 26
          • US
          #3
          Re: Inductor connected to charging IC is hot

          Originally posted by mcplslg123
          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

            • mcplslg123
              Badcaps Legend
              • Jun 2015
              • 7262
              • india
              #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

                • mobotest
                  Member
                  • Mar 2020
                  • 26
                  • US
                  #5
                  Re: Inductor connected to charging IC is hot

                  Originally posted by mcplslg123
                  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

                    • mobotest
                      Member
                      • Mar 2020
                      • 26
                      • US
                      #6
                      Re: Inductor connected to charging IC is hot

                      Bump

                        Comment

                        • Duranitron
                          Badcaps Veteran
                          • Jul 2014
                          • 544
                          • Philippines
                          #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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