LA40D550K7M - Bad T-Con Or Bad Panel

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  • Amraks
    Badcaps Veteran
    • Nov 2011
    • 725
    • Australia
    #1

    LA40D550K7M - Bad T-Con Or Bad Panel

    I am working on this tv at the moment its displaying horizontal lines.
    upon disconnecting the right side ribbon (backside) ribbon cable from the T-Con I get no lines just a perfect picture and half black screen.
    connecting the left side ribbon(backside) I get a distorted picture with lines all over half of the screen and half a black screen...



    Before I toss the rest of this tv out before removing PSU and Mainboard is the panel bad or is it t-con or assuming both?

    Someone fix up the title and add make of tv "Samsung" in front of model I seem to have forgot.
    Attached Files
    Last edited by Amraks; 07-09-2017, 05:24 AM.
    Tags: None
    • dick_barton
      Badcaps Legend
      • Aug 2015
      • 6642
      • Wales
      #2
      Re: LA40D550K7M - Bad T-Con Or Bad Panel

      I would try a replacement Tcon. They don't seem too expensive.
      Willing to help but I'm no expert.

        Comment

        • neilc6
          Badcaps Legend
          • Nov 2015
          • 1550
          • Canada
          #3
          Re: LA40D550K7M - Bad T-Con Or Bad Panel

          I would vote tcon as well. Check my post here https://www.badcaps.net/forum/showthread.php?t=61650

            Comment

            • dskall
              Badcaps Legend
              • Oct 2016
              • 2905
              • usa
              #4
              Re: LA40D550K7M - Bad T-Con Or Bad Panel

              I would try cleaning and reseating ribbon cable on bad side.
              I assume no responsibility for any stupid suggestions I might post.

                Comment

                • Amraks
                  Badcaps Veteran
                  • Nov 2011
                  • 725
                  • Australia
                  #5
                  Re: LA40D550K7M - Bad T-Con Or Bad Panel

                  Dskall cleaned with ISO, no difference same interference.


                  Anyone know how to test the t-con what voltages am I meant to be seeing?

                    Comment

                    • dskall
                      Badcaps Legend
                      • Oct 2016
                      • 2905
                      • usa
                      #6
                      Re: LA40D550K7M - Bad T-Con Or Bad Panel

                      T-con voltages (typical)
                      1. Vin (Vcc): 12Vdc or 5Vdc
                      2. (Vlogic,LCM, Vddd,VCC): 3.3Vdc
                      3. Vda (Vs, Vsource,VDD, Vdda,Avdd): 14Vdc~20Vdc
                      4. Vgh (Vgon,VGHR, Von, Vddg): 20Vdc~30Vdc
                      5. Vgl (Vgoff,VST,VGHF,VGHEVEN, Voff,Veeg): -5Vdc~-7Vdc
                      6. HVDD about 8v
                      7. DVDD,VDDC 3.3v, 1.2v
                      8. VCOM about 28v
                      I assume no responsibility for any stupid suggestions I might post.

                        Comment

                        • Amraks
                          Badcaps Veteran
                          • Nov 2011
                          • 725
                          • Australia
                          #7
                          Re: LA40D550K7M - Bad T-Con Or Bad Panel

                          Hey thanks.. No idea where any of these are the reference points might be different.

                          I also thought horizontal lines meant bad defective screen.

                            Comment

                            • dskall
                              Badcaps Legend
                              • Oct 2016
                              • 2905
                              • usa
                              #8
                              Re: LA40D550K7M - Bad T-Con Or Bad Panel

                              A pattern of lines can mean t-con or main board.
                              I assume no responsibility for any stupid suggestions I might post.

                                Comment

                                • Amraks
                                  Badcaps Veteran
                                  • Nov 2011
                                  • 725
                                  • Australia
                                  #9
                                  Re: LA40D550K7M - Bad T-Con Or Bad Panel

                                  It was a bad panel new part is doing the same.
                                  I would say this tv is now parts.

                                    Comment

                                    • dick_barton
                                      Badcaps Legend
                                      • Aug 2015
                                      • 6642
                                      • Wales
                                      #10
                                      Re: LA40D550K7M - Bad T-Con Or Bad Panel

                                      So a replacement Tcon did not resolve the problem. That's a pity.
                                      Willing to help but I'm no expert.

                                        Comment

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