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HP DV4 no power, burnt component maybe get lucky

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    HP DV4 no power, burnt component maybe get lucky


    I would like to find out what part number this is and replace it! I'm almost sure its a set of fets in that little 8 pin package...

    Anybody out there got one of these boards in the scrap pile and could verify part numbers maybe?
    Attached Files

    #2
    Re: HP DV4 no power, burnt component maybe get lucky

    and the mobo code?
    how can you read a schematic if you don`t know the motherboard code ?
    and when its PQ usually (for me was always a 30v N-channel mosfet)
    Just cook it! It's already broken.

    Comment


      #3
      Re: HP DV4 no power, burnt component maybe get lucky

      These tend to come in pairs so possibly the same as the one below in your picture
      Please upload pictures using attachment function when ask for help on the repair
      http://www.badcaps.net/forum/showthread.php?t=39740

      Comment


        #4
        Re: HP DV4 no power, burnt component maybe get lucky

        If the mainboard is LA-4101P then it is P-channel mosfet.
        http://html.alldatasheet.net/html-pd.../AM4835EP.html

        Comment


          #5
          Re: HP DV4 no power, burnt component maybe get lucky

          Originally posted by dj_ricoh View Post
          and the mobo code?
          How can you read a schematic if you don`t know the motherboard code ?
          and when its pq usually (for me was always a 30v n-channel mosfet)
          la-4111p

          Comment


            #6
            Re: HP DV4 no power, burnt component maybe get lucky

            that code its for HP compaq CQ40 :|
            Just cook it! It's already broken.

            Comment


              #7
              Re: HP DV4 no power, burnt component maybe get lucky

              AM4835EP Analog Power P-Channel 30-V (D-S) MOSFET
              Just cook it! It's already broken.

              Comment


                #8
                Re: HP DV4 no power, burnt component maybe get lucky

                Hi, did you managed to fix that laptop? If no, could you please check if it powers up with the bios recovery routine? (no USB present just to prevent unwanted updates).
                The routine is 1) unplug the power cord and battery 2) hold down WIN + B keys 3) plug in ac adapter 4) hit power button
                If it powers up please commento so I can trace my issue that is no power at all unless I make this procedure but didnĀ“t seems to work to restore bios nor charging the battery.
                Thanks and good luck

                Comment


                  #9
                  Re: HP DV4 no power, burnt component maybe get lucky

                  its main power switch mosfets.

                  Comment


                    #10
                    Re: HP DV4 no power, burnt component maybe get lucky

                    Originally posted by ktmmotocross View Post
                    its main power switch mosfets.
                    Hi Ktmmotocross, thanks for answering. Are you possitive on that? because I was almost discarding a power switch faillure since the system power up (aparently as it should) whenever I made the INSIDE bios recovery routine. No power at all in other cases, and no battery charge in both cases.

                    Thanks and sory for being repetitive!

                    Chad

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                      #11
                      Re: HP DV4 no power, burnt component maybe get lucky

                      on the other side o board is power conector, so yes im sure its main power mosfets

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