hp 450 g8 not turn on(DAX8QMB28A0 REV:A)

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  • arber1232
    Badcaps Veteran
    • Dec 2019
    • 368
    • Albania
    #1

    hp 450 g8 not turn on(DAX8QMB28A0 REV:A)

    Hi everyone !!!
    I have a Hp 450 g8 in the service which does not turn on. There is no light when I put the charger, I tried several chargers such as blue head and type-c but again no light.
    I have 19v in the mosfet and 3.3v in the power button. In the legs of the bios I have 0.1v and in the nuvoton ic I have 0.1v, so I still don't have a schematic for this laptop. I have checked all the coils in ohms but do not have shorts
    can i help me ?
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14021
      • Canada
      #2
      Re: hp 450 g8 not turn on(DAX8QMB28A0 REV:A)

      Which charger IC is onboard? Review the usual DCin mosfets and the charger IC should be nearby.

        Comment

        • arber1232
          Badcaps Veteran
          • Dec 2019
          • 368
          • Albania
          #3
          Re: hp 450 g8 not turn on(DAX8QMB28A0 REV:A)

          Bq24780s

            Comment

            • arber1232
              Badcaps Veteran
              • Dec 2019
              • 368
              • Albania
              #4
              Re: hp 450 g8 not turn on(DAX8QMB28A0 REV:A)

              Acn=0v
              acp=19.5v
              csmrc=19.5v
              acdrv-25v
              acok-0.1v
              acdet-3,3v
              adp-0v
              VCC=18.9V
              LODRV=0V
              REGN=6V
              Last edited by arber1232; 08-24-2023, 04:10 AM.

                Comment

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 14021
                  • Canada
                  #5
                  Re: hp 450 g8 not turn on(DAX8QMB28A0 REV:A)

                  ACP is ok but ACN is not. Double check the voltage to ground of ACN.

                  There will be a current sense resistor of a few milli-ohm between ACN and ACP so it does not make sense that one side will have 19v but the other side will be 0 volts. At least on a known good board, both legs should be ~19v.

                  Also, remove all power, meter in resistance mode. Check the resistance to ground of ACN.

                    Comment

                    • mcplslg123
                      Badcaps Legend
                      • Jun 2015
                      • 7262
                      • india
                      #6
                      Re: hp 450 g8 not turn on(DAX8QMB28A0 REV:A)

                      ACN/ACOK/ACDET-all are wrong. Re check your measurements.

                        Comment

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