Samsung UE55H7080 black screen (sound is working)

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #41
    Re: Samsung UE55H7080 black screen (sound is working)

    Pictures provided by shopjimmy.
    There are many test points on the T-CON, some may be under the heatsink too.
    Attached Files
    Last edited by budm; 05-14-2019, 06:14 PM.
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #42
      Re: Samsung UE55H7080 black screen (sound is working)

      OK, since you can get backlights to come on by disconnecting the EXT 1 (connector with 6 black wires) and having EXT 2, 3, and 4 connected, since T-CON board does not need EXT 1 to be in place for T-CON to work (because it is the control signal sender to control the backlights level) then you can leave EXT 1 out for now.
      Next remove EXT3 then turn on the TV, the backights should be on and then observe what you see on the screen, then turn off the TV.
      Next, put EXT3 back in place, then remove EXT4 and turn on the TV, the backlights should be on then observe what you see on the screen.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

      Comment

      • Diah
        Badcaps Legend
        • Feb 2013
        • 6357
        • Germany

        #43
        Re: Samsung UE55H7080 black screen (sound is working)

        YOURS OP that this set was working at night and next day only sound..??? are you sure the set was yours for long time ?

        BL come on when you disconnected MB from PSU or Dim socket from T-con doesn't mean BL are OK. because protection level at software was out .. disabled
        hard ware protection on PSU cant detect fault of open LED- it response only for short. only software detection can do this and this is the case

        first things you need to check visual by eyes all BL led going on by test.. if not and the sets belong to you long time.. change T-con. if you got this TV from some one then Panel fault or damaged
        Attached Files

        Comment

        • Steradiant
          Member
          • May 2019
          • 29
          • Austria

          #44
          Re: Samsung UE55H7080 black screen (sound is working)

          The last weeks I was really terribly busy. I had no time to check more on the T-CON board, hence, I decided to buy a new one (or let's better say a working one from another TV from ebay). The TV works again!!!

          Comment

          • nomoresonys
            Badcaps Legend
            • Jan 2013
            • 12129
            • U.S.

            #45
            Re: Samsung UE55H7080 black screen (sound is working)

            Ok good job, you went a long mile, if I can find a low priced tcon and I have the symptoms, sound always present, no picture with torch test etc. I grab the tcon. I've also spent 20 hours testing this and that and chasing wild possibilities but was just a faulty tcon, sometimes if it looks walks and quacks like a duck, it's just a duck.

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12129
              • U.S.

              #46
              Re: Samsung UE55H7080 black screen (sound is working)

              A good fact to remember at least for this particular model is a faulty tcon can keep the mainboard from sending the proper bl-on signal.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #47
                Re: Samsung UE55H7080 black screen (sound is working)

                Originally posted by jeffreyulrich
                Buy a bn44-00715a directly, no need to repair it
                htt******************************tml
                Did you not read which the faulty board is? Or you are just trying to sell boards? Read post #44.
                Last edited by SMDFlea; 03-31-2020, 08:12 AM.
                Never stop learning
                Basic LCD TV and Monitor troubleshooting guides.
                http://www.badcaps.net/forum/showthr...956#post305956

                Voltage Regulator (LDO) testing:
                http://www.badcaps.net/forum/showthr...999#post300999

                Inverter testing using old CFL:
                http://www.badcaps.net/forum/showthr...er+testing+cfl

                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                http://s807.photobucket.com/user/budm/library/

                TV Factory reset codes listing:
                http://www.badcaps.net/forum/showthread.php?t=24809

                Comment

                • ngth82
                  Badcaps Veteran
                  • Jul 2015
                  • 541
                  • USA

                  #48
                  Re: Samsung UE55H7080 black screen (sound is working)

                  Originally posted by budm
                  Did you not read which the faulty board is? Or you are just trying to sell boards? Read post #44.
                  Looks like the guy has nothing but posts to that website. Anyway to ban?
                  -Thomas
                  I'm a hardware engineer focused on networking equipment for my day job. I void warranties and fix consumer electronics for fun.

                  Comment

                  • diif
                    Badcaps Legend
                    • Feb 2014
                    • 6978
                    • England

                    #49
                    Re: Samsung UE55H7080 black screen (sound is working)

                    Originally posted by ngth82
                    Looks like the guy has nothing but posts to that website. Anyway to ban?
                    Anyone can report a spammer, if you click on the triangle road traffic sign looking thing under a username.

                    Comment

                    • SMDFlea
                      Super Moderator
                      • Jan 2018
                      • 20695
                      • UK

                      #50
                      Re: Samsung UE55H7080 black screen (sound is working)

                      Originally posted by diif
                      Anyone can report a spammer, if you click on the triangle road traffic sign looking thing under a username.
                      The spam post is deleted,user banned and Budm`s post with the spam link edited. Cheers diff
                      All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                      Comment

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