e701i-a3 no picture but backlights

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  • Dirtyphinger
    Member
    • Nov 2018
    • 10
    • USA

    #921
    Re: e701i-a3 no picture but backlights

    Oh sorry about that. I de-soldered(removed) the bad transistor off both of my T-con boards.
    Ok, that is what I ordered last night from mouser. Can’t wait to fix this boy but like you, I am nervous about peeling those ribbon off that panel. I will Be thourough in my testing before peeling the ribbon off panel.

    Comment

    • kevinm34232
      Badcaps Legend
      • May 2012
      • 1884
      • USA

      #922
      Re: e701i-a3 no picture but backlights

      Did you buy another t-con board? Why do you have 2?

      Comment

      • Dirtyphinger
        Member
        • Nov 2018
        • 10
        • USA

        #923
        Re: e701i-a3 no picture but backlights

        My first post exsplains. I replaced the tcon last year. Purchased from eBay for $20. Worked for 15 seconds and died again. It went back to blank screen with back light. Waiting for the transistors now. Hopefully will get em by the weekend

        Comment

        • freakaftr8
          Badcaps Legend
          • Oct 2012
          • 3743
          • USA

          #924
          Re: e701i-a3 no picture but backlights

          Originally posted by Dirtyphinger
          My first post exsplains. I replaced the tcon last year. Purchased from eBay for $20. Worked for 15 seconds and died again. It went back to blank screen with back light. Waiting for the transistors now. Hopefully will get em by the weekend
          Like I always tell people when you power up the panel on new transistors keep your hand on the plug in briefly notice which side seems darker then immediately unplug it do not keep it running as it will burn the new transistors If you need a few times to do this you can plug it in powered up in immediately unplug it after you can see I say you have about a good 3 seconds
          Did I leave the soldering iron on?

          Comment

          • budwich
            Badcaps Legend
            • Jul 2015
            • 3097
            • Canada

            #925
            Re: e701i-a3 no picture but backlights

            dirtyphinger, go to post 916 and follow the tests in the video and it appears to take the guess work totally out and save the chance of any further failures on the tcon during the "save" effort trying to identify which side is bad.
            Last edited by budwich; 02-07-2019, 01:31 PM.

            Comment

            • freakaftr8
              Badcaps Legend
              • Oct 2012
              • 3743
              • USA

              #926
              Re: e701i-a3 no picture but backlights

              OK that black line on the top lower quarter of the screen. It looks like it extends off darker on the right side. Even though the picture in the post 916 is upside down I would say there something wrong with the right 2nd or 3rd row side tab driver. The middle of the picture in the dark area is mura. This is a clear indication of the panel is not receiving or taking full voltage to the drivers as in they are shorted are loaded down. Should know that even in some repaired situations there's always a dark area in center of the screen. This is because panel is not able to produce full voltage control handled by both sides. Yours is to the extreme though.
              Did I leave the soldering iron on?

              Comment

              • kevinm34232
                Badcaps Legend
                • May 2012
                • 1884
                • USA

                #927
                Re: e701i-a3 no picture but backlights

                Where exactly are you looking at on the screen? Sorry it was upside down it's just the way it was positioned and I was by myself trying to hold it up and take a pic. On that TV, the right side was bad.


                Originally posted by freakaftr8
                OK that black line on the top lower quarter of the screen. It looks like it extends off darker on the right side. Even though the picture in the post 916 is upside down I would say there something wrong with the right 2nd or 3rd row side tab driver. The middle of the picture in the dark area is mura. This is a clear indication of the panel is not receiving or taking full voltage to the drivers as in they are shorted are loaded down. Should know that even in some repaired situations there's always a dark area in center of the screen. This is because panel is not able to produce full voltage control handled by both sides. Yours is to the extreme though.

                Comment

                • Dirtyphinger
                  Member
                  • Nov 2018
                  • 10
                  • USA

                  #928
                  Re: e701i-a3 no picture but backlights

                  Transistors came in today. Just soldered them on board. Gonna re read the test procedures & read post 916 and run my tests. Stand by. Thanks for all you brilliants!! It Boggles my mind how you came up with crazy Fix Feak. If this work which I am pretty sure will, I will be calling this TV Frankenstein which is a freak. LOL

                  Comment

                  • Dirtyphinger
                    Member
                    • Nov 2018
                    • 10
                    • USA

                    #929
                    Re: e701i-a3 no picture but backlights

                    Alright, new transistor installed right side ribbon disconnected from tcon and also disconnected from right bottom front corner of tv. I will peel the ribbons off the right side front of panel tomorrow. Question tho, after peeling right side ribbon off panel, there is no need to plug in the right side ribbon cable into the tcon board..Correct?

                    Comment

                    • Dirtyphinger
                      Member
                      • Nov 2018
                      • 10
                      • USA

                      #930
                      Re: e701i-a3 no picture but backlights

                      Actually after thinking about it I do plug in the ribbon cable to the tcon so it can power the vertical lines. Correct?
                      For some reason having a hard time attaching the pictures to this post. I’ll keep trying.

                      Comment

                      • kevinm34232
                        Badcaps Legend
                        • May 2012
                        • 1884
                        • USA

                        #931
                        Re: e701i-a3 no picture but backlights

                        Yes ribbons to T-Con connected, but on the side of the TV with low resistance, disconnect the ribbon in the corner of the panel. Then resistance should be close to same on both sides.

                        Comment

                        • Dirtyphinger
                          Member
                          • Nov 2018
                          • 10
                          • USA

                          #932
                          Re: e701i-a3 no picture but backlights

                          Originally posted by Dirtyphinger
                          Actually after thinking about it I do plug in the ribbon cable to the tcon so it can power the vertical lines. Correct?
                          For some reason having a hard time attaching the pictures to this post. I'll keep trying.
                          Update- I have a perfectly working beast of a TV today!!!! Want to give a big shout out to Freakafter8, Budwich, Kevin and everybody else that figured this workaround fix! Let's how long this works for.
                          After these pictures I peeled the ribbons off the right side panel, pugged in the ribbon cable into the Tcon, turned on and had lots of colorful vertical lines on the right side of screen. I then cleaned the right side ribbon cable and that helped some but still had some light stoving up that Sid of panel. Cleaned ribbon 3 more times with same strobing. So I changed out the tcon board to the second one I replaced the transistor on. Plugged her in and I HAVE A PERFECT PICTURE!!!
                          Attached Files

                          Comment

                          • kevinm34232
                            Badcaps Legend
                            • May 2012
                            • 1884
                            • USA

                            #933
                            Re: e701i-a3 no picture but backlights

                            Good job!

                            Comment

                            • Dirtyphinger
                              Member
                              • Nov 2018
                              • 10
                              • USA

                              #934
                              Re: e701i-a3 no picture but backlights

                              Here are the final pictures. First one is the strobingdorpt and lines running up the right side of screen. Changed out upgraded Tcon and 2 picture is the end result.
                              Attached Files

                              Comment

                              • budwich
                                Badcaps Legend
                                • Jul 2015
                                • 3097
                                • Canada

                                #935
                                Re: e701i-a3 no picture but backlights

                                I don't see the celebratory beer in the picture although I think I see the "tech" relaxing. :-) Glad to see another save successful. The tv will likely last a long time since the "infancy failure rate component" has already failed... :-)

                                Comment

                                • jackfish
                                  Senior Member
                                  • Dec 2016
                                  • 89
                                  • canada

                                  #936
                                  Re: e701i-a3 no picture but backlights

                                  I just fixed a sharp 70 inch...the tcon is a lot bigger then the sony...maby thats why it didint blow...just removed the tabs on the left side...
                                  Attached Files

                                  Comment

                                  • evanroheff21
                                    Member
                                    • Aug 2016
                                    • 45
                                    • USA

                                    #937
                                    Re: e701i-a3 no picture but backlights

                                    Has anyone got any of those tiny COXA chips left that they're not using? Bought a T-con board, disconnected the bottom left 3/4 ribbon cable as instructed, got a partial picture (all distorted lines as the TV booted up) powered it off, checked panel resistance on following the video from post #916 or whatever it was, panel seemed to check out as ok on both left and right sides. Plugged it back in carefully and back to just the black lit screen with no booting. Chip on the tcon before installing was reading like 2.1K ohms on the bottom left leg and like 10M ohms on the bottom right leg. Now it's reading like my original t-con with no ohms on the bottom right leg and like 900 ohms on the bottom left leg. I'd gladly pay somebody a couple bucks to mail me some (3 or 4) spares, otherwise I'll just buy that 10-pack from Mouser.

                                    Comment

                                    • Tvbob
                                      tvbob
                                      • Dec 2009
                                      • 204

                                      #938
                                      Re: e701i-a3 no picture but backlights

                                      HI all..Looks like you are reducing panel's (native) refresh rate buy 50% when you remove the driver boards. But you are save them from the land fill for now

                                      Comment

                                      • bradzke
                                        New Member
                                        • Apr 2019
                                        • 2
                                        • U.S.A.

                                        #939
                                        Re: e701i-a3 no picture but backlights

                                        Just started an account. Going to be working on a E701i-A3.

                                        Comment

                                        • bradzke
                                          New Member
                                          • Apr 2019
                                          • 2
                                          • U.S.A.

                                          #940
                                          Re: e701i-a3 no picture but backlights

                                          Changed a bad MOSFET. Got a partial picture with the right side disconnected. Removed the tab bonds on that side and now have a functioning 70 inch. Thanks to all for the legwork.

                                          Comment

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