dv7-4000 start up problem.

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  • quic307
    Badcaps Veteran
    • Jun 2015
    • 255
    • Greece
    #1

    dv7-4000 start up problem.

    Hello friends,
    I have a problem with HP dv7-4000. When I start up the MB, the cpu doesn't powered and shut down.
    I have 3v+5v, Bios Ec ok.

    MB - DA0LX6MB6H1 REV H.
    I attached bios+ec and schematic.

    Can anyone helps?
    Attached Files
    Tags: None
    • mcplslg123
      Badcaps Legend
      • Jun 2015
      • 7262
      • india
      #2
      Re: dv7-4000 start up problem.

      Does it have dedecated graphics like ati or nvidea?? If there then try a mild reflow of graphics chip. have seen a lot of them failing

        Comment

        • quic307
          Badcaps Veteran
          • Jun 2015
          • 255
          • Greece
          #3
          Re: dv7-4000 start up problem.

          I have changed the gpu, same issew. I measure all the coils, only CPU 0v and after 2 sec force shutdown.

            Comment

            • quic307
              Badcaps Veteran
              • Jun 2015
              • 255
              • Greece
              #4
              Re: dv7-4000 start up problem.

              It was the PU10 - VT358. I reflow it and works ...

              Good TIP !!!!

                Comment

                • Kwisatz Haderach
                  Member
                  • Aug 2015
                  • 15
                  • Spain
                  #5
                  Re: dv7-4000 start up problem.

                  Same problem -> Erratic power on: no power or shutdown in one second.
                  Same solution -> Reflow don't work. Reballing PU10 and and it works!.

                  Thanks for the tip.

                    Comment

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