Help me remove shorting Compal LA- 5752p

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  • IamPritesh
    Badcaps Veteran
    • Aug 2017
    • 356
    • India

    #1

    Help me remove shorting Compal LA- 5752p

    I had this laptop which had flickering screen but everything else was working fine.
    I tried a new lvds cable and that is when things got even worse. now the laptop does not start at all.
    If I remove the cpu, then it try to start though with leds glowing , fan moving and then shutting down obviously.
    If I put the cpu back and plug in the ac adapter, i can hear a tick tick sound coming from the cpu ..
    Upon checking I can see shorting in the 1.05VS line. PJ1 has shorting on the +1.05VS side.

    I have DC power supply , multi meter and Hot air gun if that helps . Attached the schematic as well
    Attached Files
  • piernov
    Super Moderator
    • Jan 2016
    • 4435
    • France

    #2
    Re: Help me remove shorting Compal LA- 5752p

    What's the exact resistance to ground on +1.05VS?
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment

    • IamPritesh
      Badcaps Veteran
      • Aug 2017
      • 356
      • India

      #3
      Re: Help me remove shorting Compal LA- 5752p

      Its 0.008

      Comment

      • IamPritesh
        Badcaps Veteran
        • Aug 2017
        • 356
        • India

        #4
        Re: Help me remove shorting Compal LA- 5752p

        Tried with another CPU as well.. no luck.

        Comment

        • piernov
          Super Moderator
          • Jan 2016
          • 4435
          • France

          #5
          Re: Help me remove shorting Compal LA- 5752p

          Resistance in ohm, not diode mode.
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

          Comment

          • IamPritesh
            Badcaps Veteran
            • Aug 2017
            • 356
            • India

            #6
            Re: Help me remove shorting Compal LA- 5752p

            Its 0.00 in ohms

            Comment

            • aanan
              Badcaps Veteran
              • Dec 2010
              • 222
              • India

              #7
              Re: Help me remove shorting Compal LA- 5752p

              remove cpu & check res also check q11 remove L25,L26 & check res.

              Comment

              • piernov
                Super Moderator
                • Jan 2016
                • 4435
                • France

                #8
                Re: Help me remove shorting Compal LA- 5752p

                Lots of stuff on +1.05VS, easiest is to inject 1V at 3 or 4A and check what gets hot, without CPU. First suspect: PCH.
                But first you can remove PJ14 and check that the short is on +1.05VS and not +1.05VSP.
                OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                Comment

                • IamPritesh
                  Badcaps Veteran
                  • Aug 2017
                  • 356
                  • India

                  #9
                  Re: Help me remove shorting Compal LA- 5752p

                  Its 0.02 ohms at PJ1 if I remove the CPU

                  Comment

                  • IamPritesh
                    Badcaps Veteran
                    • Aug 2017
                    • 356
                    • India

                    #10
                    Re: Help me remove shorting Compal LA- 5752p

                    PJ14 is not connected and its short only on one side ( +1.05VS )

                    Comment

                    • IamPritesh
                      Badcaps Veteran
                      • Aug 2017
                      • 356
                      • India

                      #11
                      Re: Help me remove shorting Compal LA- 5752p

                      Originally posted by aanan
                      remove cpu & check res also check q11 remove L25,L26 & check res.
                      Removing L25 and L26 has removed the tick tick sound when CPU is attached to the socket.
                      But now board does not even start without cpu ..no leds glowing, no 3 or 5 volt on the coils

                      Comment

                      • piernov
                        Super Moderator
                        • Jan 2016
                        • 4435
                        • France

                        #12
                        Re: Help me remove shorting Compal LA- 5752p

                        Sorry misread the schematics, +1.05VS is obviously taken from +1.1V_VCCPP, not +1.05VSP…
                        Try to inject 1 volt on +1.05VS still.
                        OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                        Comment

                        • IamPritesh
                          Badcaps Veteran
                          • Aug 2017
                          • 356
                          • India

                          #13
                          Re: Help me remove shorting Compal LA- 5752p

                          Originally posted by piernov
                          Sorry misread the schematics, +1.05VS is obviously taken from +1.1V_VCCPP, not +1.05VSP…
                          Try to inject 1 volt on +1.05VS still.
                          The DC power supply does not show shorting after removing L25 and L26 , but there is no 5 volt or 3 Volt even without the CPU .
                          Have i messed it up ? Earlier I could atleast start the board without CPU ..
                          Please suggest

                          Comment

                          • piernov
                            Super Moderator
                            • Jan 2016
                            • 4435
                            • France

                            #14
                            Re: Help me remove shorting Compal LA- 5752p

                            Check resistance on both pads of L25 and L26 to see if there is a short there.
                            OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                            Comment

                            • IamPritesh
                              Badcaps Veteran
                              • Aug 2017
                              • 356
                              • India

                              #15
                              Re: Help me remove shorting Compal LA- 5752p

                              L25 and L26 has 0.00 ohms on side of the pad

                              Comment

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