Sony shorted screen,fixed

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  • martino
    Not so "senior"
    • Aug 2013
    • 997
    • canada
    #1

    Sony shorted screen,fixed

    Hi,thought I would post this in the hope it can save some tv's.

    Sony KDL-42ex440,completely dead,no reaction on buttons etc,as if main fuse is blown.
    Disconnected LVDS cable to t-con,tv comes alive,no picture of course.
    Reconnect LVDS,disconnect one of two ribbons to panel,tv comes alive with halve screen,other side white.
    Reconnect that ribbon,disconnect the other ribbon,tv completely dead again.

    Looked at small PCB that's attached to panel along the edge,found that the 3 larger capacitors(one by each tab) measured 2.6 ohms.Suspected them to be in parallel.
    Removed the capacitor closest to the ribbon cable connector,short gone and tv works perfectly fine again.

    Hope this will help somebody
    Attached Files
    Proud owner of dozens of broken TV's and many,many,many boards.


    Our website and passion:http://hollenhundshepherds.com/
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Sony shorted screen,fixed

      Nice work locating bad cap.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

        • martino
          Not so "senior"
          • Aug 2013
          • 997
          • canada
          #3
          Re: Sony shorted screen,fixed

          Lol,super easy to find. I posted this more for awareness,as in "don't give up on panel too soon"
          I fixed a few this way,some samsungs etc. Never had luck on LG with this.

          It would probably be a good idea to replace that cap,so far I just remove them,never had one come back yet.
          Proud owner of dozens of broken TV's and many,many,many boards.


          Our website and passion:http://hollenhundshepherds.com/

            Comment

            • syaoran123
              Senior Member
              • Jun 2014
              • 178
              • Australia
              #4
              Re: Sony shorted screen,fixed

              Thanks for sharing. Were there any visual signs of damage? What models have u tried this on?

                Comment

                • martino
                  Not so "senior"
                  • Aug 2013
                  • 997
                  • canada
                  #5
                  Re: Sony shorted screen,fixed

                  Originally posted by syaoran123
                  Thanks for sharing. Were there any visual signs of damage? What models have u tried this on?
                  Can't remember the models,it's wide spread.
                  When in diagnosing I get halve screen results,I then measure all caps on those narrow boards. Been lucky with this often enough to make it an effort
                  No signs of damage to caps,they just measure very low ohms.
                  Proud owner of dozens of broken TV's and many,many,many boards.


                  Our website and passion:http://hollenhundshepherds.com/

                    Comment

                    • mmartell
                      Badcaps Legend
                      • Oct 2013
                      • 3189
                      • Canada
                      #6
                      Re: Sony shorted screen,fixed

                      Nice save and thanks for posting it.

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA
                          #7
                          Re: Sony shorted screen,fixed

                          BTW, the failure mode for those MLCC is shorts or bad leakage resistance.
                          Never stop learning
                          Basic LCD TV and Monitor troubleshooting guides.
                          http://www.badcaps.net/forum/showthr...956#post305956

                          Voltage Regulator (LDO) testing:
                          http://www.badcaps.net/forum/showthr...999#post300999

                          Inverter testing using old CFL:
                          http://www.badcaps.net/forum/showthr...er+testing+cfl

                          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                          http://s807.photobucket.com/user/budm/library/

                          TV Factory reset codes listing:
                          http://www.badcaps.net/forum/showthread.php?t=24809

                            Comment

                            • ivtec
                              Badcaps Legend
                              • Dec 2008
                              • 1967
                              • USA
                              #8
                              Re: Sony shorted screen,fixed

                              Thanks Martino good job, that's why i say Badcaps forum is the best Forum ever.

                                Comment

                                • ReeceyBurger123
                                  Never Give Up !
                                  • May 2014
                                  • 7325
                                  • Britain
                                  #9
                                  Re: Sony shorted screen,fixed

                                  Nice work buddy, I recently had a 32" Sammy panel shorted ceramic and smd transistor changed with ones off a smashed screen (same model) and sorted it seems to be newer sets having his issue. Done a vid on it.
                                  Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                                  https://www.facebook.com/Telford-Tel...7894576335359/

                                    Comment

                                    • CapLeaker
                                      Leaking Member
                                      • Dec 2014
                                      • 8146
                                      • Canada
                                      #10
                                      Re: Sony shorted screen,fixed

                                      good detective work!

                                        Comment

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