KDL-40NX800 lines in half screen!

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  • Andreasbest
    Badcaps Legend
    • Aug 2014
    • 1133
    • Hellas ( Greece )

    #1

    KDL-40NX800 lines in half screen!

    Hello fellow technicians and happy easter.
    Today a Sony Bravia KDL-40NX800 arrived and according to customer due to weekend and without any use produced lines in half screen.
    Unfortunately no service manual or diagrams (for free or sale) for this set so i'm kinda "blind" and hoping for your help.
    Check pictures of all boards and the fault it self.
    What do you think?
    Attached Files
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: KDL-40NX800 lines in half screen!

    Panel problem.
    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

    • CapLeaker
      Leaking Member
      • Dec 2014
      • 7978
      • Canada

      #3
      Re: KDL-40NX800 lines in half screen!

      gets my vote too... toasted panel

      Comment

      • Andreasbest
        Badcaps Legend
        • Aug 2014
        • 1133
        • Hellas ( Greece )

        #4
        Re: KDL-40NX800 lines in half screen!

        So directly to recycle?

        Comment

        • freakaftr8
          Badcaps Legend
          • Oct 2012
          • 3743
          • USA

          #5
          Re: KDL-40NX800 lines in half screen!

          Oh it's got that infamous sharp tcon board. I have my doubts on the panel being bad now. Try heating up the tcon board especially around the main processors. Watch for picture change
          Last edited by freakaftr8; 04-11-2018, 08:52 AM.
          Did I leave the soldering iron on?

          Comment

          • Davi.p
            Badcaps Legend
            • Sep 2009
            • 4265
            • Italy - Milan

            #6
            Re: KDL-40NX800 lines in half screen!

            For me it's not serious to attempt a long distance diagnose, until you don't provide how the image in your picture is came up, i.e. if you post the same source signal on a good tv (if any there was), and if you explain why an half of screen is black, is due to a disconnected cable? If not i would say a bad FPC on the black half, not full repairable but pressure on FPC can help, if yes there's something could be done to repair it (FPC masking on tcon output).. anyway seems a panel problem.
            Last edited by Davi.p; 04-11-2018, 12:55 PM.

            Comment

            • Andreasbest
              Badcaps Legend
              • Aug 2014
              • 1133
              • Hellas ( Greece )

              #7
              Re: KDL-40NX800 lines in half screen!

              No source at all, i just turn on tv and on all inouts produce this.
              Half screen is black because i have no input as i said.
              All cables look intact and tight.

              Comment

              • Davi.p
                Badcaps Legend
                • Sep 2009
                • 4265
                • Italy - Milan

                #8
                Re: KDL-40NX800 lines in half screen!

                You can make the common test to detach one (if there are two, if not 2) tcon output flat cable at a time and see the image (post it).

                Comment

                • Andreasbest
                  Badcaps Legend
                  • Aug 2014
                  • 1133
                  • Hellas ( Greece )

                  #9
                  Re: KDL-40NX800 lines in half screen!

                  Originally posted by freakaftr8
                  Oh it's got that infamous sharp tcon board. I have my doubts on the panel being bad now. Try heating up the tcon board especially around the main processors. Watch for picture change
                  Ok found the issue.
                  The IC i marked with red below nand it's the one responsible for the helf right scrren needs reballing/reflowing, after very little heating starts to work as it should.
                  Now i have reflow it 3 times already and gonna do it one more time tomorrow, then i'll assemble it and test it for some hours.
                  Thank you very much all and especially freakaftr8 and his idea, i would have waste it already without him

                  Comment

                  • freakaftr8
                    Badcaps Legend
                    • Oct 2012
                    • 3743
                    • USA

                    #10
                    Re: KDL-40NX800 lines in half screen!

                    Good to hear I've had this problem 3 times with 3 different TV's ranging from 46 to 52 inch. All use this tcon. And all were NX800 models. I have successfully reflowed one out of all three that I have tried to repair. This seems to be a tricky board for re flow. It may take for a while but then it will go again. The IC really needs to be reballed instead of reflowed.

                    Glad you found the issue.
                    Did I leave the soldering iron on?

                    Comment

                    • Andreasbest
                      Badcaps Legend
                      • Aug 2014
                      • 1133
                      • Hellas ( Greece )

                      #11
                      Re: KDL-40NX800 lines in half screen!

                      I'll try with reflowing because cost of reballing is above cost of another tcon.
                      If no luck then new tcon

                      Comment

                      • Davi.p
                        Badcaps Legend
                        • Sep 2009
                        • 4265
                        • Italy - Milan

                        #12
                        Re: KDL-40NX800 lines in half screen!

                        I've heard of some repairs where a simple reflow with hot gun/air station will not last, it is needed a cooking on oven...

                        Comment

                        • peterkos2
                          Member
                          • Nov 2020
                          • 40
                          • Slovensko

                          #13
                          Re: KDL-40NX800 lines in half screen!

                          Hello everyone.
                          I also have a problem with the SONY KDL-40 NX 800 TV. The belts were running on the screen and I also heated the main chip with a heat gun and the belts got lost. The TV went nice but the next day after a while the same thing happened again. I also have a hot air station - how many degrees should I heat it up? Or then at what temperature to cook in the oven?
                          Thank you for your response
                          Attached Files

                          Comment

                          • Diah
                            Badcaps Legend
                            • Feb 2013
                            • 6343
                            • Germany

                            #14
                            Re: KDL-40NX800 lines in half screen!

                            275Β° for whole life

                            Comment

                            • Andreasbest
                              Badcaps Legend
                              • Aug 2014
                              • 1133
                              • Hellas ( Greece )

                              #15
                              Re: KDL-40NX800 lines in half screen!

                              Be aware that no matter what you do it will occur again and sooner.
                              The problem is lack of thermal protection (small heatsinks), even if you replace mainboard it will occur again

                              Comment

                              • peterkos2
                                Member
                                • Nov 2020
                                • 40
                                • Slovensko

                                #16
                                Re: KDL-40NX800 lines in half screen!

                                Thanks for the answers.
                                I must say that I also removed the silicone heat-conducting pads, because oil was precipitated on them.

                                Comment

                                • Andreasbest
                                  Badcaps Legend
                                  • Aug 2014
                                  • 1133
                                  • Hellas ( Greece )

                                  #17
                                  Re: KDL-40NX800 lines in half screen!

                                  If possible add larget heatsinks.

                                  Comment

                                  • peterkos2
                                    Member
                                    • Nov 2020
                                    • 40
                                    • Slovensko

                                    #18
                                    Re: KDL-40NX800 lines in half screen!

                                    Should I buy new thermally conductive silicone pads ?. Can they release oil after heating because they are old? They are about 10 years old on this TV.
                                    Only the second time the fault was repeated shortly after turning on the TV.
                                    well thank you

                                    Comment

                                    • peterkos2
                                      Member
                                      • Nov 2020
                                      • 40
                                      • Slovensko

                                      #19
                                      Re: KDL-40NX800 lines in half screen!

                                      Can the leaked oil from the thermal pad cause any image distortion?

                                      Comment

                                      • nomoresonys
                                        Badcaps Legend
                                        • Jan 2013
                                        • 12081
                                        • U.S.

                                        #20
                                        Re: KDL-40NX800 lines in half screen!

                                        Maybe clean it up and replace those leaky pads for sure.

                                        Comment

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