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
    Tags: None
    • 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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