19v power not passing through

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  • zhang
    Senior Member
    • Jun 2017
    • 50
    • Indonesia

    #1

    19v power not passing through

    Hi Folks,
    Recently I encounter motherboard with board code x451ca rev 2.1
    charging ic is bq24725
    which comes with 19v power voltage can not pass the both adaptor mosfet ( N channel )
    checked for the gate ( should be greater than drain pin ) but it appears to be only 1 volts ( which caused the 19v can not go through and only present 1v on PR8806 )
    checked the acdrv pin from ic PU2800 still about 1v
    for the ic, vcc present 19v, acok present 2.5 ( which should be normal )
    changed few pcs of ic, seems to be the same result

    Regards to all
  • piernov
    Super Moderator
    • Jan 2016
    • 4435
    • France

    #2
    Re: 19v power not passing through

    Check if the DC-in MOSFETs are shorted, common issue.
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment

    • zhang
      Senior Member
      • Jun 2017
      • 50
      • Indonesia

      #3
      Re: 19v power not passing through

      Originally posted by piernov
      Check if the DC-in MOSFETs are shorted, common issue.
      Checked, working normal
      replaced with normal working also in vain

      Comment

      • zhang
        Senior Member
        • Jun 2017
        • 50
        • Indonesia

        #4
        Re: 19v power not passing through

        Originally posted by zhang
        Hi Folks,
        Recently I encounter motherboard with board code x451ca rev 2.1
        charging ic is bq24725
        which comes with 19v power voltage can not pass the both adaptor mosfet ( N channel )
        checked for the gate ( should be greater than drain pin ) but it appears to be only 1 volts ( which caused the 19v can not go through and only present 1v on PR8806 )
        checked the acdrv pin from ic PU2800 still about 1v
        for the ic, vcc present 19v, acok present 2.5 ( which should be normal )
        changed few pcs of ic, seems to be the same result

        Regards to all
        seems like I accidentally solved it and yet till now still don't understand what is going on and why it turn on normally
        I give 9v power to the adp gate
        and it works
        just wondering what might be problem

        Comment

        • z3h1r
          Member
          • May 2014
          • 10
          • Turkiye

          #5
          Re: 19v power not passing through

          There is static electricity. Connect the 19 volt adapter to the device. Short-circuit the device at the DC socket.Asus laptops have such a problem.

          Comment

          • zhang
            Senior Member
            • Jun 2017
            • 50
            • Indonesia

            #6
            Re: 19v power not passing through

            Originally posted by z3h1r
            There is static electricity. Connect the 19 volt adapter to the device. Short-circuit the device at the DC socket.Asus laptops have such a problem.
            if talking about static electricity,
            the notebook has been disassembly for about two week with no power ( battery, adaptor, cmos )
            that should be quite a long time for non power state

            Comment

            • zhang
              Senior Member
              • Jun 2017
              • 50
              • Indonesia

              #7
              Re: 19v power not passing through

              Originally posted by z3h1r
              There is static electricity. Connect the 19 volt adapter to the device. Short-circuit the device at the DC socket.Asus laptops have such a problem.
              if it is because of static electricity, what should I do next time if I encounter similar ( but not the same ) situation?

              Comment

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