Samsung UE50TU8070UXZT bootloop display problem

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  • fanaticgames
    Senior Member
    • May 2017
    • 138
    • italy
    #1

    Samsung UE50TU8070UXZT bootloop display problem

    Hi guys I have a problem with this TV, once it is turned on it restarts continuously (only the backlight is present, no image), by disconnecting the flat of the display it remains on regularly, can I solve it with scotch tape? What slopes of the flat can I cover?
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    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12093
      • U.S.
      #2
      Re: Samsung UE50TU8070UXZT bootloop display problem

      https://www.youtube.com/watch?v=pfrRhw7-ZII

        Comment

        • fanaticgames
          Senior Member
          • May 2017
          • 138
          • italy
          #3
          Re: Samsung UE50TU8070UXZT bootloop display problem

          Originally posted by nomoresonys
          https://www.youtube.com/watch?v=pfrRhw7-ZII
          yes but I can't find the tracks of the clock signal

            Comment

            • howardc64
              Badcaps Veteran
              • Jun 2017
              • 560
              • United States
              #4
              Re: Samsung UE50TU8070UXZT bootloop display problem

              Originally posted by fanaticgames
              yes but I can't find the tracks of the clock signal
              Posted a slide summary on Samsung 4K panel connections. Can help you understand what all the flex connection pins are

              https://www.badcaps.net/forum/showthread.php?t=118541

                Comment

                • fanaticgames
                  Senior Member
                  • May 2017
                  • 138
                  • italy
                  #5
                  Re: Samsung UE50TU8070UXZT bootloop display problem

                  Originally posted by howardc64
                  Posted a slide summary on Samsung 4K panel connections. Can help you understand what all the flex connection pins are

                  https://www.badcaps.net/forum/showthread.php?t=118541
                  the problem is only on the right cof, isolating 1 ckv signal you get an image but not acceptable, unfortunately the panel has to be thrown away, samsung rubbish
                  Last edited by fanaticgames; 04-28-2023, 05:02 AM.

                    Comment

                    • fanaticgames
                      Senior Member
                      • May 2017
                      • 138
                      • italy
                      #6
                      Re: Samsung UE50TU8070UXZT bootloop display problem

                      With scotch tape, I think the lines next to it didn't make contact, I cut the pcb directly on the ckv signals of the right cof and I got an excellent result, there is only a thin line that comes out intermittently every 10 seconds
                      Attached Files

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                        • howardc64
                          Badcaps Veteran
                          • Jun 2017
                          • 560
                          • United States
                          #7
                          Re: Samsung UE50TU8070UXZT bootloop display problem

                          Originally posted by fanaticgames
                          With scotch tape, I think the lines next to it didn't make contact, I cut the pcb directly on the ckv signals of the right cof and I got an excellent result, there is only a thin line that comes out intermittently every 10 seconds
                          This document explains fixing CKV lines on slightly older Samsung TVs. It talks about strap CKV* and CKVB* pairs after disconnecting from the panel. Also possible connect them to GND or VOFF. This is more advanced than I understand. Just FYI

                          https://www.electronica-pt.com/esque...-repair-65862/

                          This video explains CKV* and CKVB* (B=Bar or inverted signal) are generated from the same source. I guess above author is expecting a fault before CKV/CKVB pair is generated. However, for these newer Samsung Panels, CVK/CKVB comes directly out of the single SOC on main so maybe no longer fault in pairs... I don't really know.

                          https://youtu.be/izd7dhtmZjc?t=879
                          Last edited by howardc64; 04-28-2023, 05:00 PM.

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