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Missing 3.3v/5v always on hp laptop

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    #1

    Missing 3.3v/5v always on hp laptop

    Hello brothers

    Im working on hp:
    DA0U83MB6E0
    REV : E

    I don't have 3.3v / 5v always, the bios have 0v, the power button does have 3.3v, and 5v does appear on some other components. But always voltage they don't appear on both coils...

    I removed the 3.3v/5v chip as well as 4 mosfets but still doing the same thing, The mosfet they do receive 19v on one side of which it okay, but they don't generate 3.3v and 5v.
    Tags: None
    #2
    Re: Missing 3.3v/5v always on hp laptop

    DC-in jack LED lighting up?
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment

      #3
      Re: Missing 3.3v/5v always on hp laptop

      Originally posted by piernov View Post
      DC-in jack LED lighting up?
      Yes there is a light on the charging pin

      Comment

        #4
        Re: Missing 3.3v/5v always on hp laptop

        Measure voltage on PU9 PIN 1/6/8/16/17/18/23.

        Comment

          #5
          Re: Missing 3.3v/5v always on hp laptop

          Originally posted by mcplslg123 View Post
          Measure voltage on PU9 PIN 1/6/8/16/17/18/23.
          Sorry for late response, the client took it and returned it back, but so far what i can tell you is that when you plug in the adapter, the white light 💡 comes up even if there is no battery on the laptop, it charges the battery, when you press the power button, the white led flashes 3 times but if you plug in the adapter it doesn't do anything, with battery plugged in flashes 3 times

          Comment

            #6
            Re: Missing 3.3v/5v always on hp laptop

            Originally posted by piernov View Post
            DC-in jack LED lighting up?
            The adapter jack led on the laptop flashes 3 time when you press the press the power button, but if adapter is plugged and you press the power button it doesn't do anything but on battery does flash 3 times when you press the power button

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              #7
              Re: Missing 3.3v/5v always on hp laptop

              3 blinks means battery is discharged.
              OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

              Comment

                #8
                Re: Missing 3.3v/5v always on hp laptop

                Originally posted by piernov View Post
                3 blinks means battery is discharged.
                Im confused now brother, the board is not turning On, let me show you something im confused, I don't know what to check now

                PQ2 is 19v and 2.7 volts on the otherside, but again im not saying it faulty
                Attached Files

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                  #9
                  Re: Missing 3.3v/5v always on hp laptop

                  PQ2 is discharge mosfet. So 19V on one side and 2.7V on other side is correct.

                  Comment

                    #10
                    Re: Missing 3.3v/5v always on hp laptop

                    What is the voltage on pin 76/64/65 of kbc??

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                      #11
                      Re: Missing 3.3v/5v always on hp laptop

                      Originally posted by mcplslg123 View Post
                      Measure voltage on PU9 PIN 1/6/8/16/17/18/23.
                      You didnt gave measurements and you say you are confused??

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