Panel ribbon cable on SONY KDL-50W704

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  • maleksa
    Senior Member
    • Jul 2017
    • 50
    • Malaysia
    #1

    Panel ribbon cable on SONY KDL-50W704

    I would very much appreciate it if someone can tell me how or point me in the right direction (YouTube video perhaps) on how to remove the panel ribbon cable from the TCON board on the SONY KDL-50W704 without destroying it. I hope to fix the ribbon cables on a new TCON board.

    The ribbon cables appear to have been glued on to the TCON board. I've attached some pictures to give you an idea. Any help would be much appreciated.
    Attached Files
    Tags: None
    • diif
      Badcaps Legend
      • Feb 2014
      • 6978
      • England
      #2
      Re: Panel ribbon cable on SONY KDL-50W704

      The ribbon cables are adhered to the board with special adhesive tape that conducts in one direction. They are attached with a very expensive machine using heat and pressure, the tape is also fairly expensive also.
      There are several threads on here and videos on YouTube. Search for tab bond repair.
      A bit of heat softens the adhesive to allow the tab to be pulled off without damage. The attaching is the hard part.

        Comment

        • petehall347
          Badcaps Legend
          • Jan 2015
          • 4426
          • United Kingdom
          #3
          Re: Panel ribbon cable on SONY KDL-50W704

          be easier to repair the board .

            Comment

            • maleksa
              Senior Member
              • Jul 2017
              • 50
              • Malaysia
              #4
              Re: Panel ribbon cable on SONY KDL-50W704

              Thanks guys.

              Correct me if I am wrong but from what I can see, the TCON boards for this generation of SONY TVs seems to have been embedded with the panel circuit board. So half the screen is connected directly to the TCON board (50T08-C04) and the other half to a panel circuit board (50T08-S02). The TCON board and the panel circuit boards are connected via a ribbon cable.

              When all the boards are connected, I get multiple images on the screen (see the attached picture).

              However, when I disconnect the panel circuit board from the TCON board by removing the ribbon cable, I get a good clear half picture but only at the half that is connected to the TCON board. (see the 2nd picture below)

              I have got a new 50T08-S02 board. I tried connecting the TCON board to the new 50T08-s02 panel board (which is not connected to the screen just yet). However, I get the multiple images again but only half the screen. The other half which is not connected to the new 50t08-s02 board remains white. It appears that the TCON board seems to have a problem when it is connected to the 50t08-s02 board even when the 50t08-s02 board is not connected to the screen.

              Can I safely assume that something is wrong with the TCON board?

              The TCON board has the following ICs
              AUO 12309
              AUO M106-11
              AUO P301-16
              AUO-G1422

              Can someone tell me what those ICs are for? If I were to replace them, would it help solve the display problems that I am having.

              Cheers in advance!
              Attached Files

                Comment

                • diif
                  Badcaps Legend
                  • Feb 2014
                  • 6978
                  • England
                  #5
                  Re: Panel ribbon cable on SONY KDL-50W704

                  Check for shorted ceramic capacitors on that board.

                    Comment

                    • R_J
                      Badcaps Legend
                      • Jun 2012
                      • 9535
                      • Canada
                      #6
                      Re: Panel ribbon cable on SONY KDL-50W704

                      Here is a video you could watch https://www.youtube.com/watch?v=faHnLqrlL3o

                        Comment

                        • attainteddragon
                          Badcaps Veteran
                          • Apr 2013
                          • 764
                          • australia
                          #7
                          Re: Panel ribbon cable on SONY KDL-50W704

                          hello bad panel.
                          WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                            Comment

                            • maleksa
                              Senior Member
                              • Jul 2017
                              • 50
                              • Malaysia
                              #8
                              Re: Panel ribbon cable on SONY KDL-50W704

                              Originally posted by diif
                              Check for shorted ceramic capacitors on that board.
                              I tried measuring the capacitors on the 50T08-C04 board using a DMM. I then measured the corresponding/same capacitors on a new 50T08-C04 board. I was surprised to see note that the capacitors around the AUO-G1422 chip were all different by up to 24%.

                              Can a defective IC cause these differences in measurements?

                                Comment

                                • will hosenbaum
                                  New Member
                                  • Sep 2021
                                  • 1
                                  • Brazil
                                  #9
                                  Re: Panel ribbon cable on SONY KDL-50W704

                                  so did you solved it ? was it the ic ?
                                  i have the same tv with the same symptoms

                                    Comment

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