Samsung UN70NU6900F no picture and no sound

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  • jchang
    New Member
    • Jul 2016
    • 9
    • United States
    #1

    Samsung UN70NU6900F no picture and no sound

    Hi all

    I was just given a Samsung TV with the issue. I read various threads and videos and attempted the ribbon tape method to gain an image, but no luck.



    Symptom:
    No picture no sound.
    When I plug in the power cord, Backlight LED turns on for a half second and then turns off. The red LED next to the power button located center bottom flashes 2 or 3 times. When the power button is pressed after, it does the same thing.
    No sound at all.



    What I tried:
    1. I tried unplugging the left or right ribbon cable to the panel, if I unplug EITHER cable, the LED backlight stays on and gains sound(smart hub sound when turned on) TV now stays on. If I plug both, I get the same symptom above.
    2. If I unplug the power cable from the power board to the mainboard (the mainboard gets no power), the LED backlight stays on. No sound.
    3. If I unplug EITHER the left or right panel film ribbon cable(third pic, brown cable), the power LED will STAY ON. If I press the hub button I get the smart TV sound. but no image whatsoever.
    4. I tried the tape method. simply put as long as I keep the 2nd pin from the right side from either the left or the right cable(doesn't matter both), all ribbon cables are plugged in, the backlight stays on and I get the hub sound. But still no picture. I tried covering different combinations of pins prob 10 attempts, but I got no image at all.

    I ran out of ideas and had to post here to ask for advise to you guys. Please help!
    Attached Files
    Tags: None
    • jchang
      New Member
      • Jul 2016
      • 9
      • United States
      #2
      Re: Samsung UN70NU6900F no picture and no sound

      Reserved

        Comment

        • Storyteller12
          Badcaps Veteran
          • Jun 2020
          • 624
          • USA
          #3
          Re: Samsung UN70NU6900F no picture and no sound

          There is a thread on this tv already I believe.

          But basically it’s a panel issue as you have confirmed that it stays on if either side is unplugged from the panel. You can check for shorted caps on the panel/ buffer board. Most likely tape method is your best shot though. Just haven’t found he right pins to cover.

          It’s a tedious process sometimes

            Comment

            • jchang
              New Member
              • Jul 2016
              • 9
              • United States
              #4
              Re: Samsung UN70NU6900F no picture and no sound

              Yea, I saw that post but did not help me.
              Tried the 25/30DCV from R13236 to VGH with wire and 84th pin tape did not help. I get 0.1~0.2 mV on that R13236 register pin when TV is one(without and with ribbon, same throughout the settings)

              Need little light on finding that right pin.

              I also noticed that if I plug in either ribbon after turning on the TV after unplugging the ribbon, I get the full picture perfectly. Turn it off and it does that blinking again.
              Last edited by jchang; 01-10-2023, 02:50 PM. Reason: update

                Comment

                • Storyteller12
                  Badcaps Veteran
                  • Jun 2020
                  • 624
                  • USA
                  #5
                  Re: Samsung UN70NU6900F no picture and no sound

                  https://www.badcaps.net/forum/showthread.php?t=105591

                  Post #6

                    Comment

                    • nomoresonys
                      Badcaps Legend
                      • Jan 2013
                      • 12196
                      • U.S.
                      #6
                      Re: Samsung UN70NU6900F no picture and no sound

                      Thats a good one, I'm still wondering how Diah figured out exactly which lines to block, Diah you must be a dam tv whisperer, great work. reference from the movie "The Horse Whisperer" 1998, https://www.imdb.com/title/tt0119314/ pretty good movie.
                      Last edited by nomoresonys; 01-10-2023, 03:20 PM.

                        Comment

                        • jchang
                          New Member
                          • Jul 2016
                          • 9
                          • United States
                          #7
                          Re: Samsung UN70NU6900F no picture and no sound

                          Tried masking 14~23(9pins), but still blinking(twice).
                          Attached Files

                            Comment

                            • Storyteller12
                              Badcaps Veteran
                              • Jun 2020
                              • 624
                              • USA
                              #8
                              Re: Samsung UN70NU6900F no picture and no sound

                              It’s trial and error then unfortunately.

                              Keep us posted if you make any progress

                                Comment

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