Sony KDL-55ex720 tab bond problem and TCON?

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  • curt2199
    Senior Member
    • Oct 2013
    • 54
    • United States
    #1

    Sony KDL-55ex720 tab bond problem and TCON?

    I picked this TV up for free and the person admitted to spraying the screen with windex which then cause this problem. There were just a few lines but removing the bezel and frame caused more to pop up. I discovered that the yellow ribbon cable has separated and putting pressure on it cause almost all the lines to go away leaving what you see in the picture. I have since cleaned up all the corrosion caused by the windex. When pushing on a different yellow ribbon the large vertical bands go to one solid dark color but they never disappear so I'm wondering if the windex shorted a connection and cause the TCON to go bad as well?
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    • budwich
      Badcaps Legend
      • Jul 2015
      • 3097
      • Canada
      #2
      Re: Sony KDL-55ex720 tab bond problem and TCON?

      those connection ... if they are still like that, need more cleaning... severely but gently... :-)

        Comment

        • Davi.p
          Hobbist Tech
          • Sep 2009
          • 4542
          • Italy - Milan
          #3
          Re: Sony KDL-55ex720 tab bond problem and TCON?

          This tv needs about a magician to turn back to the early days... no damage to tcon..
          Last edited by Davi.p; 09-14-2017, 09:54 AM.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: Sony KDL-55ex720 tab bond problem and TCON?

              You need good magnifying glass to inspect the boding and the copper traces to see if any conductor got eaten sway or not, and yes, it needs really good cleaning.
              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

                • curt2199
                  Senior Member
                  • Oct 2013
                  • 54
                  • United States
                  #5
                  Re: Sony KDL-55ex720 tab bond problem and TCON?

                  Yep, I cleaned the corrosion off with a fiberglass brush. The some of the conductor got eaten away that wasn't under the yellow ribbon attached to the board. At this point the biggest issue is the yellow ribbon itself requires pressure on it to keep the lines from showing. It appears it itself has separated.

                    Comment

                    • Davi.p
                      Hobbist Tech
                      • Sep 2009
                      • 4542
                      • Italy - Milan
                      #6
                      Re: Sony KDL-55ex720 tab bond problem and TCON?

                      I think you can do anything because if you have to press on the tab, the tab itself is damaged, so you have to jump over the corrosion on th tab, but on the tab you can't solder with tin, only with silver paint, but there are too much traces damaged..

                        Comment

                        • curt2199
                          Senior Member
                          • Oct 2013
                          • 54
                          • United States
                          #7
                          Re: Sony KDL-55ex720 tab bond problem and TCON?

                          Actually it's not the tab. I have to put pressure in the middle of the yellow ribbon because there is a clear separation between the two layers of the ribbon as I can see the gap. If I push the two layers together then most of the lines go away. I was trying To come up with some sort of adhesive that I could use to seal the two ribbon layers back together but wouldn't be conductive shorting the traces in the ribbon.

                            Comment

                            • curt2199
                              Senior Member
                              • Oct 2013
                              • 54
                              • United States
                              #8
                              Re: Sony KDL-55ex720 tab bond problem and TCON?

                              I also tried hearing the cable to see if it would self-stick back together but that didn't work.

                                Comment

                                • chrismurphy
                                  Badcaps Veteran
                                  • May 2014
                                  • 251
                                  • australia
                                  #9
                                  Re: Sony KDL-55ex720 tab bond problem and TCON?

                                  You probably dont want to hear this but you wont be able to repair this
                                  There are places that will rebond the tabs but at a cost of over $300 , for the age and size probably not worth it

                                    Comment

                                    • curt2199
                                      Senior Member
                                      • Oct 2013
                                      • 54
                                      • United States
                                      #10
                                      Re: Sony KDL-55ex720 tab bond problem and TCON?

                                      Yeah I figured as much. It was free so was just hoping I could make it work. I'm not ok t anything and I'll pull the boards and put them on eBay.

                                        Comment

                                        • Ashg
                                          New Member
                                          • Apr 2021
                                          • 1
                                          • Australia
                                          #11
                                          Re: Sony KDL-55ex720 tab bond problem and TCON?

                                          Styrofoam to add pressure on the card.

                                            Comment

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