Hp 15 - la-a994p

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  • amatic
    Member
    • Oct 2016
    • 12
    • Croatia
    #1

    Hp 15 - la-a994p

    Can anyone confirm whether I'm doing a good diagnostic. I'm total beginner in these things.

    I'm working on the HP 15 board number LA-A9945.

    I have only the cable for the power button and the DC jack, RAM and the processor
    connected to the board.


    On chip U301 RT8243AZQW pins 15-LD03 and 14-LD05. I did not have any voltage.
    At 11-VIN pin I had 19V. The rails +3VALWP and +5VALWP were not in short circuit.
    I replaced the chip. And on pin 15 I had 1V and at pin 14 5V.
    After 20 seconds the chip stopped working.
    And now, as soon as I connect my laptop to power, it's U301 is getting very hot.

    And I see that +3VALWP is in short circuit, at pin 14 and 15 I have nothing.

    +3VALWP is going every were, is there simple way to find short. and what about U301 what I did wrong?
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4439
      • France
      #2
      Re: Hp 15 - la-a994p

      PU301 should not get hot. If it gets hot, he might be the culprit of your short-circuit so try to unsolder PL302 and check which side is shorted.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • amatic
          Member
          • Oct 2016
          • 12
          • Croatia
          #3
          Re: Hp 15 - la-a994p

          PL302 is on 5V rail. You think on PL303.
          I have unsolder PJ302 jumper and short is not on the PU301 side. It is somewere. U18, PU1801... how can I be sure? Is unsoldering components and jumpers only way?
          Under microscope everything looks OK.
          Is there boardview for this board? I can't find some caps present on schematics.

            Comment

            • subroto
              Badcaps Veteran
              • Oct 2015
              • 230
              • Bangladesh
              #4
              Re: Hp 15 - la-a994p

              Unmount the chip. Then find out short on +3VLDO, if not then unmount the coil OF +3VALW rail. Check the capacitor and also the two MOSFETs before the coil of +3VALW. I hope you'll be able to find the short circuit.

                Comment

                • amatic
                  Member
                  • Oct 2016
                  • 12
                  • Croatia
                  #5
                  Re: Hp 15 - la-a994p

                  Short is not on the chip side.

                    Comment

                    • smali
                      Badcaps Veteran
                      • Sep 2014
                      • 287
                      • Pakistan
                      #6
                      Re: Hp 15 - la-a994p

                      Check u44 (kb9012 )..

                        Comment

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