HP dag54amb6d0 No Power

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  • ronelex
    Senior Member
    • Oct 2016
    • 195
    • Philippines

    #1

    HP dag54amb6d0 No Power

    I have this unit came from other shop, NO light on the charger.
    missing VIN Supply that is used to power up main regulator and other supplies.
    I have checked the charging IC but it is different from the board that I worked before.

    U19
    pin 18 DCIN - 19v
    Pin 1 ACIN - 2.5v
    Pin 2 ACOK - 3.1v
    Pin 20 VDD - 5.2v
    Pin 19 VDD - 5.2v
    Pin 29 ISLCMSRC - 19v

    Attached Files
  • stingerchamp
    Badcaps Veteran
    • Sep 2020
    • 425
    • Pakistan

    #2
    Re: HP dag54amb6d0 No Power

    What is voltage on cmsrc line pin 29 and gate of pq50 and pin 30 of ic, also check pq54 for short to ground
    Last edited by stingerchamp; 11-21-2020, 06:57 AM.

    Comment

    • stingerchamp
      Badcaps Veteran
      • Sep 2020
      • 425
      • Pakistan

      #3
      Re: HP dag54amb6d0 No Power

      Adding above pin ,6 of ic should be high when ic detects valid adapter, it is a signal to Io that adapter present.

      Comment

      • ronelex
        Senior Member
        • Oct 2016
        • 195
        • Philippines

        #4
        Re: HP dag54amb6d0 No Power

        This is what I read on those pins
        PQ50 - 25v
        Pin 29 - 19v
        Pin 30 - 25v
        Pin 6 - 0v

        Comment

        • stingerchamp
          Badcaps Veteran
          • Sep 2020
          • 425
          • Pakistan

          #5
          Re: HP dag54amb6d0 No Power

          Voltage on ad_id?
          Did you check pq54 ?

          Also check pc357 and pc 5315 capacitors short to ground

          You said main regulator ? Which one

          Comment

          • ronelex
            Senior Member
            • Oct 2016
            • 195
            • Philippines

            #6
            Re: HP dag54amb6d0 No Power

            ad_id meausures 1.09v
            PQ5is god
            No short
            Idont know how to create the VIN Supply rail

            Comment

            • stingerchamp
              Badcaps Veteran
              • Sep 2020
              • 425
              • Pakistan

              #7
              Re: HP dag54amb6d0 No Power

              check pc357 and pc 5315 capacitors in beep mode

              Comment

              • ronelex
                Senior Member
                • Oct 2016
                • 195
                • Philippines

                #8
                Re: HP dag54amb6d0 No Power

                No beep at all sir
                it reads 0.600V in diode mode

                Comment

                • stingerchamp
                  Badcaps Veteran
                  • Sep 2020
                  • 425
                  • Pakistan

                  #9
                  Re: HP dag54amb6d0 No Power

                  Your charging ic is not working properly
                  Replace it, before replacing do check pq53 .
                  Last edited by stingerchamp; 11-25-2020, 06:48 AM.

                  Comment

                  • Sametbey
                    Badcaps Veteran
                    • Jan 2021
                    • 229
                    • Turkey

                    #10
                    Re: HP dag54amb6d0 No Power

                    looking at the measurement values in your first message, it seems that the PR382 is also a VIN voltage. U5101 bios can be improved with flash program. If u5101 in 8 pin 3.3 v
                    I'm not happy to be so strong. because it's not humanly

                    Comment

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