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Samsung UN70NU6900F no picture and no sound

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    #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
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    #2
    Re: Samsung UN70NU6900F no picture and no sound

    Reserved

    Comment

      #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

        #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

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          #5
          Re: Samsung UN70NU6900F no picture and no sound

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

          Post #6

          Comment

            #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

              #7
              Re: Samsung UN70NU6900F no picture and no sound

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

              Comment

                #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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