Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

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  • Shinju
    Badcaps Legend
    • Mar 2014
    • 1239
    • USA

    #1

    Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

    I am posting this for others to see since there is not any information on this unit here.

    I got this 55" for free the TV works but the display has dotted lines strobbing while the picture is displayed. They are really apparent on black scenes and not so much on brighter scenes.

    These dotted lines do not bleed or have the melting effect/ghosting.


    I am 90% sure this is a bad panel, I even broke it down to the tab bond level and applied pressure to them and this did not change how they acted.

    5% t-con 5% mainboard. Bummer too this was actually a nice panel for the time.

    Anyway here are some photos for future reference for folks who might encounter this problem.

    Also feel free to chime in if you might have some incite/input!
    Attached Files
    Last edited by Shinju; 07-25-2014, 12:14 PM.
  • DemonBG
    Senior Member
    • Mar 2012
    • 143
    • USA

    #2
    Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

    T-con failure - Had a UE40C6510 with an extremely similar fault today... (Although mine had nothing on the scnreen but the dots /lines where strobing on and off).

    T-con in my tv is a S120APM4C4LV0.4 too!

    Worth trying out

    Good luck,
    Demon

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #3
      Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

      You can access service menu and select test pattern options from it to confirm whether main board, t-con or panel are at fault. Given fault image, highly doubt panel is bad.
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

      Comment

      • Shinju
        Badcaps Legend
        • Mar 2014
        • 1239
        • USA

        #4
        Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

        I tried to access the get patterns in the SM and they wouldn't stay running it would fault back to the menu to access them.

        Maybe I far fingered the button, I will try again when I get back into town.

        Comment

        • Shinju
          Badcaps Legend
          • Mar 2014
          • 1239
          • USA

          #5
          Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

          @tom66

          Which test patterns determan what failure?

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

            What do you have available? Varies by model.
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • Shinju
              Badcaps Legend
              • Mar 2014
              • 1239
              • USA

              #7
              Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

              So this is what I got, seems if I do READ_POST_PATT_SEL the test patterns are fine. The PRE_PATT_SEL the test patterns are affected with strobbing dots ect.
              Attached Files

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

                How about afterDDR and beforeDDR FRCS patterns?
                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                Comment

                • Shinju
                  Badcaps Legend
                  • Mar 2014
                  • 1239
                  • USA

                  #9
                  Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

                  Originally posted by tom66
                  How about afterDDR and beforeDDR FRCS patterns?
                  Nothing shows up on the screen for those. I had a hdmi signal playing in the background should I have not done that?

                  Before DDR 0/15 patterns displayed.
                  After DDR 0/8 patterns displayed.

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

                    You should get patterns. In my mind it is pointing to T-con fault.
                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                    Comment

                    • Shinju
                      Badcaps Legend
                      • Mar 2014
                      • 1239
                      • USA

                      #11
                      Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

                      No patterns without a signal either, logic patterns don't show up as well.

                      What does t-con USB failure mean?

                      (not sure why these are showing up side ways when they are loaded up and displayed in the upload window normal.)
                      Attached Files
                      Last edited by Shinju; 07-28-2014, 09:27 AM.

                      Comment

                      • Shinju
                        Badcaps Legend
                        • Mar 2014
                        • 1239
                        • USA

                        #12
                        Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

                        Will any S120APM4C4LV0.4 t-con work I see quite a few for various panel sizes but the S120APM4C4LV0.4 is the same for this model and others as well.

                        Thanks guys!

                        Comment

                        • DemonBG
                          Senior Member
                          • Mar 2012
                          • 143
                          • USA

                          #13
                          Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

                          They are all the same and are used on multiple different panel sizes.... Good luck

                          Comment

                          • Shinju
                            Badcaps Legend
                            • Mar 2014
                            • 1239
                            • USA

                            #14
                            Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

                            Originally posted by DemonBG
                            They are all the same and are used on multiple different panel sizes.... Good luck
                            Thought so, just wanted to make sure, I know some T-cons actually have to match certain part numbers for example like LG ect.


                            Word, found one for cheap I hope it works!


                            Thanks DemonBG!

                            Tom66

                            I will update as soon as this part comes in and I get it installed.

                            Thanks to you both for the help!

                            Comment

                            • Shinju
                              Badcaps Legend
                              • Mar 2014
                              • 1239
                              • USA

                              #15
                              Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

                              This one.

                              http://www.ebay.com/itm/171389750528...84.m1497.l2649

                              Comment

                              • DemonBG
                                Senior Member
                                • Mar 2012
                                • 143
                                • USA

                                #16
                                Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

                                looks about right! Good luck with the fix and hope it sorts you out!

                                Comment

                                • Shinju
                                  Badcaps Legend
                                  • Mar 2014
                                  • 1239
                                  • USA

                                  #17
                                  Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

                                  So I was doing a little searching and it looks like the S120APM4C4LV0.4 3464E0 (bar code number) is the one for this panel.

                                  The one I ordered S120APM4C4LV0.4 3334J0.

                                  I will get it today so we shall see if it works :P

                                  Comment

                                  • Shinju
                                    Badcaps Legend
                                    • Mar 2014
                                    • 1239
                                    • USA

                                    #18
                                    Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

                                    T-con did not fix the flickering dots. Test more later but I assume it's a mainboard issue or panel.

                                    Comment

                                    • Shinju
                                      Badcaps Legend
                                      • Mar 2014
                                      • 1239
                                      • USA

                                      #19
                                      Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

                                      I also noticed that the Service menu under shop options has 3D options and 2 of them are turned on. I have not messed with them yet as I ran out of time last night.

                                      So I am at a loss what it would be, the test patterns tested the exact same as the previous T-con so its got to be the mainboard at this point or panel?

                                      Comment

                                      • Shinju
                                        Badcaps Legend
                                        • Mar 2014
                                        • 1239
                                        • USA

                                        #20
                                        Re: Samsung UN55C6400RFXZA Strobing flickering lines of dots on the display

                                        Gonna try a different mainboard, BN94-03404K (its for a 46") should be able to adjust panel type ect.

                                        Comment

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