Hp 440 g4 charging

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  • motanya
    Senior Member
    • Nov 2021
    • 162
    • Kenya
    #1

    Hp 440 g4 charging

    Someone Help! I have an hp 440 g4 laptop, powers on with battery and adapter, works with either or both. If I connect the battery it does not show if charger is connected, if I remove the battery it shows charger is connected, I have changed charging ic and mosfets along the charging line but the behaviour is same, does anyone know how I can solve this?
    Attached Files
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    • mon2
      Badcaps Legend
      • Dec 2019
      • 14677
      • Canada
      #2
      Re: Hp 440 g4 charging

      Hi.

      1) be sure you are using a suitable power adapter for this laptop.

      2) attach the adapter & confirm the voltage to ground of ACDET pin #6 on the charger IC.
      Attached Files

        Comment

        • motanya
          Senior Member
          • Nov 2021
          • 162
          • Kenya
          #3
          Re: Hp 440 g4 charging

          Originally posted by mon2
          Hi.

          1) be sure you are using a suitable power adapter for this laptop.

          2) attach the adapter & confirm the voltage to ground of ACDET pin #6 on the charger IC.
          Thank you for your response. I have used the correct power adapter that works fine with another laptop of the same model. The voltage reading is 2.7v. Is it okay?

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14677
              • Canada
              #4
              Re: Hp 440 g4 charging

              ACDET is ok.

              What is the voltage to ground of the ACDRV pin? You can measure at pin #4 of the 2*DCin mosfets.

              This voltage must be ~25v to enable the mosfets.

              Often, the 2nd DCin mosfet gets damaged.

                Comment

                • motanya
                  Senior Member
                  • Nov 2021
                  • 162
                  • Kenya
                  #5
                  Re: Hp 440 g4 charging

                  Originally posted by mon2
                  ACDET is ok.

                  What is the voltage to ground of the ACDRV pin? You can measure at pin #4 of the 2*DCin mosfets.

                  This voltage must be ~25v to enable the mosfets.

                  Often, the 2nd DCin mosfet gets damaged.
                  Interestingly enough the voltage is 25

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 14677
                      • Canada
                      #6
                      Re: Hp 440 g4 charging

                      With only the battery connected (no power adapter), what is the voltage to ground at the ACDRV pin?

                        Comment

                        • motanya
                          Senior Member
                          • Nov 2021
                          • 162
                          • Kenya
                          #7
                          Re: Hp 440 g4 charging

                          Originally posted by mon2
                          with only the battery connected (no power adapter), what is the voltage to ground at the acdrv pin?
                          0v

                            Comment

                            • mon2
                              Badcaps Legend
                              • Dec 2019
                              • 14677
                              • Canada
                              #8
                              Re: Hp 440 g4 charging

                              That is correct for this case - since only the battery is used to power the logic board.

                              Remove all power. Meter in resistance mode.

                              Check the resistance across the DCin mosfets to see if they are leaking.

                              Source (1-2-3) & Drain (5-6-7-8)
                              Source (1-2-3) & gate (4)
                              Gate (4) & Drain (5-6-7-8)


                              Post each measurement. If the resistance check is low, the mosfet is leaking and must be replaced.

                              One meter probe to one pin to measure; other meter probe to other pin to measure. Also post the meter scale used for the check.

                                Comment

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