Samsung UN70NU6070 TV Issue - HELP!

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  • Djgh
    Member
    • Jul 2021
    • 14
    • US

    #1

    Samsung UN70NU6070 TV Issue - HELP!

    Evening,

    I started experiencing color/brightness issues with my 70” Samsung tv after a year or so from date of purchase. It doesn't seem as bright and the colors are a little off. Is this a backlight issue or something else? I'm pretty hands on, so I don't mind tackling the issue if I can pinpoint what it is.

    Any help would be appreciated.

    Model #: UN70NU6070

    Video comparison:
    https://youtu.be/6dNhwNy_lus
    Attached Files
    Last edited by SMDFlea; 07-12-2021, 06:36 AM. Reason: Added UN70NU6070 to thread title
  • alfatv
    Badcaps Veteran
    • Sep 2020
    • 353
    • Canada

    #2
    Re: Samsung UN70NU6070 TV Issue - HELP!

    Yes, it could be backlight. Did you you run it at 100%?
    In the meantime you can change color temperature setting in user menu and tune white balance in service menu. Reduce backlight to minimum possible setting.
    For best results run the test with fully white screen.
    If white is good, you can play with tint setting for colors, but better set it in the middle.

    Comment

    • Djgh
      Member
      • Jul 2021
      • 14
      • US

      #3
      Re: Samsung UN70NU6070 TV Issue - HELP!

      Originally posted by alfatv
      Yes, it could be backlight. Did you you run it at 100%?
      In the meantime you can change color temperature setting in user menu and tune white balance in service menu. Reduce backlight to minimum possible setting.
      For best results run the test with fully white screen.
      If white is good, you can play with tint setting for colors, but better set it in the middle.
      Appreciate it the advice. I've played with all the settings, performed a picture and power reset, and even spoke with a Samsung representative. None of those were helpful. I may end up replacing the backlight due to it being inexpensive but was still hoping someone could pinpoint the exact issue.

      Comment

      • R_J
        Badcaps Legend
        • Jun 2012
        • 9532
        • Canada

        #4
        Re: Samsung UN70NU6070 TV Issue - HELP!

        It is unlikely to be the backlight, I would first check the source, possible bad hdmi cable? The next thing I would check (reseat) is the LVDS cable between the main board and t-con.

        Comment

        • ducky29
          Badcaps Veteran
          • Dec 2015
          • 370
          • Europe

          #5
          Re: Samsung UN70NU6070 TV Issue - HELP!

          Change the picture settings to vivid or standard. See if that makes any difference.

          Comment

          • Djgh
            Member
            • Jul 2021
            • 14
            • US

            #6
            Re: Samsung UN70NU6070 TV Issue - HELP!

            Originally posted by R_J
            It is unlikely to be the backlight, I would first check the source, possible bad hdmi cable? The next thing I would check (reseat) is the LVDS cable between the main board and t-con.
            Ordered a new tcon board so let's see what happens.

            Originally posted by ducky29
            Change the picture settings to vivid or standard. See if that makes any difference.
            Lol thanks for your Input.

            Comment

            • mmartell
              Badcaps Legend
              • Oct 2013
              • 3189
              • Canada

              #7
              Re: Samsung UN70NU6070 TV Issue - HELP!

              Probably a gamma issue on the tcon. Think you're on the right track.

              Comment

              • dick_barton
                Badcaps Legend
                • Aug 2015
                • 6642
                • Wales

                #8
                Re: Samsung UN70NU6070 TV Issue - HELP!

                Originally posted by mmartell
                Probably a gamma issue on the tcon. Think you're on the right track.
                +1
                It does look as though the black level is washed out.
                Willing to help but I'm no expert.

                Comment

                • alfatv
                  Badcaps Veteran
                  • Sep 2020
                  • 353
                  • Canada

                  #9
                  Re: Samsung UN70NU6070 TV Issue - HELP!

                  Can you go this site and post pictures of gradients white red green blue?
                  https://www.eizo.be/monitor-test/

                  Comment

                  • Djgh
                    Member
                    • Jul 2021
                    • 14
                    • US

                    #10
                    Re: Samsung UN70NU6070 TV Issue - HELP!

                    Replaced the tcon board. It's definitely better but not perfect, then again I'm comparing it to the picture on my iPhone. It's still a little saturated (maybe that's the word)

                    Comment

                    • Djgh
                      Member
                      • Jul 2021
                      • 14
                      • US

                      #11
                      Re: Samsung UN70NU6070 TV Issue - HELP!

                      People’s faces look like they have a bad tan

                      Comment

                      • R_J
                        Badcaps Legend
                        • Jun 2012
                        • 9532
                        • Canada

                        #12
                        Re: Samsung UN70NU6070 TV Issue - HELP!

                        Do you have pictures of both t-con boards? it is possible they could be for different models. You can't always go by the BNxx-xxxxxx number you need to use the number on the white sticker. I suspect there is an eeprom on the board and it bight be programmed for a different panel or main board
                        Last edited by R_J; 07-17-2021, 10:17 AM.

                        Comment

                        • Djgh
                          Member
                          • Jul 2021
                          • 14
                          • US

                          #13
                          Re: Samsung UN70NU6070 TV Issue - HELP!

                          Originally posted by R_J
                          Do you have pictures of both t-con boards? it is possible they could be for different models. You can't always go by the BNxx-xxxxxx number you need to use the number on the white sticker. I suspect there is an eeprom on the board and it bight be programmed for a different panel or main board
                          Not anymore. Old board is long gone but I purchased the new board based off the sticker on the back.

                          Comment

                          • Djgh
                            Member
                            • Jul 2021
                            • 14
                            • US

                            #14
                            Re: Samsung UN70NU6070 TV Issue - HELP!

                            Another thing I noticed is that when I first turn the tv on, the colors appear to be perfect but slowly goes back to its original color issue

                            Comment

                            • frannyjunk
                              Senior Member
                              • Oct 2010
                              • 78

                              #15
                              Re: Samsung UN70NU6070 TV Issue - HELP!

                              Could be the backlights. The phosporous on some of the LEDs may be failing causing a shift towards blue/purple (or pink before it gets to blue/purple).

                              Comment

                              • Djgh
                                Member
                                • Jul 2021
                                • 14
                                • US

                                #16
                                Re: Samsung UN70NU6070 TV Issue - HELP!

                                Originally posted by frannyjunk
                                Could be the backlights. The phosporous on some of the LEDs may be failing causing a shift towards blue/purple (or pink before it gets to blue/purple).
                                The led strips could cause the color discrepancy? Am I wrong to assume the leds only assisted in fixing dark spots on the screen.

                                Comment

                                • ducky29
                                  Badcaps Veteran
                                  • Dec 2015
                                  • 370
                                  • Europe

                                  #17
                                  Re: Samsung UN70NU6070 TV Issue - HELP!

                                  Yes they do but I have never found a samsung with that fault. Mostly vestels and LG. The picture will get blueish but I don't think this is the case.

                                  Comment

                                  • petehall347
                                    Badcaps Legend
                                    • Jan 2015
                                    • 4425
                                    • United Kingdom

                                    #18
                                    Re: Samsung UN70NU6070 TV Issue - HELP!

                                    turn the red up and see what happens

                                    Comment

                                    • Davi.p
                                      Hobbist Tech
                                      • Sep 2009
                                      • 4278
                                      • Italy - Milan

                                      #19
                                      Re: Samsung UN70NU6070 TV Issue - HELP!

                                      Much probably bad backlight, must check power supply output tensions for the leds, must be in the range, if not it can ruin the led phosphors by too much tension. If those are ok so are bad leds.

                                      Comment

                                      • angelos
                                        Badcaps Veteran
                                        • Dec 2012
                                        • 562
                                        • South Africa

                                        #20
                                        Re: Samsung UN70NU6070 TV Issue - HELP!

                                        Originally posted by frannyjunk
                                        Could be the backlights. The phosporous on some of the LEDs may be failing causing a shift towards blue/purple (or pink before it gets to blue/purple).
                                        +1
                                        I totally agree with that.

                                        Comment

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