Hp DV7 ( Quanta R33 ) No power , No Led

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  • delphi_firebird
    Member
    • Mar 2015
    • 36
    • France
    #1

    Hp DV7 ( Quanta R33 ) No power , No Led

    Hello,
    I am new in laptop motherboard diagnostic ,
    I got this motherboard : Quanta R33 HP Dv7 with no power & no led on .

    +3VS5 and +5VS5 are pressent but +3V and +5V are missing ( Pq55 and Pq47 does not turn on => MAIND is missing )

    MAINON is alternating between 0 and 1,05V aprox every 2 seconds .

    I noticed +12VALW is missing too .

    Q1: Can anybody tels me where is +12VALW coming from ?
    Q2: i didn't find schematic of PU13 SLG55448VTR to figure out how it works . can anybody explain me ? .

    Excuse my english ,
    And than you by advance for your efforts .
    Attached Files
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    • meritosari
      Senior Member
      • Oct 2010
      • 774
      • Indonesia
      #2
      Re: Hp DV7 ( Quanta R33 ) No power , No Led

      https://cdn.badcaps-static.com/pdfs/...0c828c330e.pdf

        Comment

        • delphi_firebird
          Member
          • Mar 2015
          • 36
          • France
          #3
          Re: Hp DV7 ( Quanta R33 ) No power , No Led

          @meritosari thank you for schematic .

          I revolved the problem .

          the PC135 was bad , it wasn't totaly shorted to ground but it droped the current.
          i replace it and the computer work again

            Comment

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