Samsung UE55NU7026K always restart

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  • avalente123
    Avalente
    • Dec 2017
    • 9
    • Portugal

    #1

    Samsung UE55NU7026K always restart

    Hello

    I have one LCD TV SAMSUNG UE55NU7026K and it starts, blink 2 times led, backlight on then about 4 seconds, restart again, but no logo appears on the screen. I disconect the power supply cable to the Mainboard and power is ok and backlight also ok.
    With the mainboard BN94-12869G connect, the voltages are ok, 13 Volts and 3,3 Volts also.
    I know that the problem is mainboard, but could be the software?
    I try to find firmware for this mainboard but can“t find
    Can any one give me some help?

    Thank you
  • EazyBone
    Badcaps Legend
    • Jun 2023
    • 1306
    • United states

    #2
    Re: Samsung UE55NU7026K always restart

    This is a panel short. Disconnect one of the tcon ribbons going from the main board (if there's 2) and turn the TV on. Which ever one allows the TV on will be short. Investigate this first before replacing anything. Next, you can sometimes "repair" the tv slightly so that it's usable. Sometimes it appears perfect sometimes it will flicker or have lines or whatever by using a piece of tape to find the short on one of the pins. There is some YouTube videos about this. Before researching see if disconnect a cable will turn it on

    It is not the main board most likely. I am new to this but I literally had a TV doing this yesterday and it's 100 percent a panel short in my case. For you, we will see. A piece of tape will tell you. Good luck

    Comment

    • avalente123
      Avalente
      • Dec 2017
      • 9
      • Portugal

      #3
      Re: Samsung UE55NU7026K always restart

      I forget to tell that already take out the flat cable to the panel from mainboard. For now it is not the panel.

      Comment

      • EazyBone
        Badcaps Legend
        • Jun 2023
        • 1306
        • United states

        #4
        Re: Samsung UE55NU7026K always restart

        Originally posted by avalente123
        I forget to tell that already take out the flat cable to the panel from mainboard. For now it is not the panel.
        You need pictures for us. The whole back as a whole and each individual board

        Comment

        • alfatv
          Badcaps Veteran
          • Sep 2020
          • 353
          • Canada

          #5
          Re: Samsung UE55NU7026K always restart

          Originally posted by avalente123
          I forget to tell that already take out the flat cable to the panel from mainboard. For now it is not the panel.
          For now LOL

          Comment

          • avalente123
            Avalente
            • Dec 2017
            • 9
            • Portugal

            #6
            Re: Samsung UE55NU7026K always restart

            Here the photos from TV
            Attached Files

            Comment

            • lotas
              Badcaps Legend
              • Jan 2016
              • 4516
              • Russia

              #7
              Re: Samsung UE55NU7026K always restart

              You have two loops, so that the TV would turn on without these loops disconnected from the panel, you need to put a jumper on the motherboard between the points FB_TRDY_1 and FB_TRDY_3.

              Comment

              • avalente123
                Avalente
                • Dec 2017
                • 9
                • Portugal

                #8
                Re: Samsung UE55NU7026K always restart

                i made jumper between the FB_TRDY_1 and FB_TRDY_3 but same problem. I will buy a used mainboard for test. Then i wiil write results. i am afraid that panel have something wrong, but need to find

                Comment

                • zwarder
                  Member
                  • Oct 2013
                  • 45
                  • United Kingdom

                  #9
                  Re: Samsung UE55NU7026K always restart

                  Try blocking ckv lines with tape method worked for my 6 series

                  Comment

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