TCL 40FS3800 Stuck in Screen Test Pattern

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  • Louis82
    Badcaps Veteran
    • Feb 2012
    • 240
    • USA
    #1

    TCL 40FS3800 Stuck in Screen Test Pattern

    Hello there,

    I have a TCL Tv that the initial problem was that it would play fine for 10 to 15 seconds and it would cut off. So I replaced the main board and tv played great but when I was closing the tv I noticed a distorted picture. I wiggle the LVDS cable that connects main board to interface board (not sure if I would call it T-Con) and picture looked good. I taped the LVDS cable thinking it was loose but nothing, problem still come and goes when I wiggle cable.
    I decided to reversed the cable (it works with samsung tvs) and tv now shows like if its stuck in a test pattern. It shows green, blue, red color (see pictures).
    I couldn't understand why so I put it back to like it was originally and now it doesnt show anything at all, just the backlight appears to be on and sound.

    Any suggestions? I added a few pictures.

    Thanks for your time.
    Attached Files
    Tags: None
    • dskall
      Badcaps Legend
      • Oct 2016
      • 2905
      • usa
      #2
      Re: TCL 40FS3800 Stuck in Screen Test Pattern

      Check fuse on panel pcb
      I assume no responsibility for any stupid suggestions I might post.

        Comment

        • Louis82
          Badcaps Veteran
          • Feb 2012
          • 240
          • USA
          #3
          Re: TCL 40FS3800 Stuck in Screen Test Pattern

          Fuse is good

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: TCL 40FS3800 Stuck in Screen Test Pattern

              I would remove the cable and inspect the exposed conductors at both ends to make sure they are not damaged.
              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

                • Louis82
                  Badcaps Veteran
                  • Feb 2012
                  • 240
                  • USA
                  #5
                  Re: TCL 40FS3800 Stuck in Screen Test Pattern

                  I replaced the cable today. Same issue.

                    Comment

                    • dskall
                      Badcaps Legend
                      • Oct 2016
                      • 2905
                      • usa
                      #6
                      Re: TCL 40FS3800 Stuck in Screen Test Pattern

                      Do you have a good ground
                      I assume no responsibility for any stupid suggestions I might post.

                        Comment

                        • Louis82
                          Badcaps Veteran
                          • Feb 2012
                          • 240
                          • USA
                          #7
                          Re: TCL 40FS3800 Stuck in Screen Test Pattern

                          You know, I was wondering the same. Can I attach a wire from the circuit board to the screen metal shield? FYI Power cord has only 2 legs.

                            Comment

                            • Th3_uN1Qu3
                              Believe in
                              • Jul 2010
                              • 6031
                              • Romania
                              #8
                              Re: TCL 40FS3800 Stuck in Screen Test Pattern

                              Originally posted by Louis82
                              You know, I was wondering the same. Can I attach a wire from the circuit board to the screen metal shield?
                              Yes you can.

                              This is actually a big problem on some ASUS laptop LVDS cable - they use the silver conductive mesh tape which the cable is wrapped in, as the only ground of the circuit. Seen it cause quite a mess of an intermittent issue. Ran a wire from one connector all the way to the other, soldered on both sides, problem solved.
                              Originally posted by PeteS in CA
                              Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                              A working TV? How boring!

                                Comment

                                • Louis82
                                  Badcaps Veteran
                                  • Feb 2012
                                  • 240
                                  • USA
                                  #9
                                  Re: TCL 40FS3800 Stuck in Screen Test Pattern

                                  I used al alligator from tape to screen (metal) still the same. Pic is attached.
                                  I'm starting to think that I damaged the screen.
                                  Attached Files

                                    Comment

                                    • Louis82
                                      Badcaps Veteran
                                      • Feb 2012
                                      • 240
                                      • USA
                                      #10
                                      Re: TCL 40FS3800 Stuck in Screen Test Pattern

                                      I believe that when I reversed the cable, I probably didn't put the cable correctly and the pins did not seat correctly and caused a short that allowed the tv to go into screen test pattern. How do I get out of that?

                                        Comment

                                        • Louis82
                                          Badcaps Veteran
                                          • Feb 2012
                                          • 240
                                          • USA
                                          #11
                                          Re: TCL 40FS3800 Stuck in Screen Test Pattern

                                          Here are two pics of the immediate components that are located right where the LVDS connector goes on the screen side. Maybe you guys can see something.
                                          Attached Files

                                            Comment

                                            • vinceroger69
                                              Badcaps Legend
                                              • Mar 2012
                                              • 6714
                                              • uk
                                              #12
                                              Re: TCL 40FS3800 Stuck in Screen Test Pattern

                                              ignore, just seen you have already tested the panel pcb fuse
                                              Last edited by vinceroger69; 07-20-2017, 07:27 AM.

                                                Comment

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