Samsung UE55MU6120K Boot loop with backlight no video

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  • lotas
    Badcaps Legend
    • Jan 2016
    • 4459
    • Russia

    #41
    Re: Samsung UE55MU6120K Boot loop with backlight no video

    This jumper is placed to determine which half of the panel is not working, insert one cable and turn on the TV, then do the same with the other cable.

    Comment

    • lotas
      Badcaps Legend
      • Jan 2016
      • 4459
      • Russia

      #42
      Re: Samsung UE55MU6120K Boot loop with backlight no video

      Here I give you a photo of each half (left and right cable) where to isolate the CKV. Maybe it will be easier for you.
      Attached Files

      Comment

      • Diah
        Badcaps Legend
        • Feb 2013
        • 6343
        • Germany

        #43
        Re: Samsung UE55MU6120K Boot loop with backlight no video

        lotas photo this is the cKV usual get issue at NU/MU/TU.
        ESD you cant test them with DMM. only if you have Laser Temp pointer you will find one of them more warm to hot than other.

        Comment

        • fanaticgames
          Senior Member
          • May 2017
          • 138
          • italy

          #44
          Re: Samsung UE55MU6120K Boot loop with backlight no video

          Originally posted by lotas
          Here I give you a photo of each half (left and right cable) where to isolate the CKV. Maybe it will be easier for you.
          I put scotch tape on both flats and the result is that it restarts anyway, tried to put first on one, then on the other and then on both, when the flats are connected the TV restarts

          I positioned the tape counting pin by pin with the microscope so there is no error, covered the pins from 12 to 20 and then from 75 to 83
          Attached Files
          Last edited by fanaticgames; 02-19-2023, 03:20 PM.

          Comment

          • lotas
            Badcaps Legend
            • Jan 2016
            • 4459
            • Russia

            #45
            Re: Samsung UE55MU6120K Boot loop with backlight no video

            Remove the jumper and test without it. Isolated should be only on one half, on the one that does not work.
            And you need to put adhesive tape on the other side where the contacts are on the cable.
            Last edited by lotas; 02-19-2023, 03:35 PM.

            Comment

            • fanaticgames
              Senior Member
              • May 2017
              • 138
              • italy

              #46
              Re: Samsung UE55MU6120K Boot loop with backlight no video

              Originally posted by lotas
              Remove the jumper and test without it. Isolated should be only on one half, on the one that does not work.
              And you need to put adhesive tape on the other side where the contacts are on the cable.
              The
              jumper has already been removed, the wire is broken, and I tested it by covering one flat at a time

              obvious that the tape is also on the side of the pins
              Last edited by fanaticgames; 02-19-2023, 03:59 PM.

              Comment

              • Diah
                Badcaps Legend
                • Feb 2013
                • 6343
                • Germany

                #47
                Re: Samsung UE55MU6120K Boot loop with backlight no video

                mask only the LVDS on the top of MB.... from Top count 11 pins and mask 9 pins.. it can be too from top start from 10 or 9 try you will have working TV at least but not perfect

                by the way we have in forum digram where to mask on NU... MU will be same way just 1.2 more or less...
                Last edited by Diah; 02-19-2023, 04:03 PM.

                Comment

                • fanaticgames
                  Senior Member
                  • May 2017
                  • 138
                  • italy

                  #48
                  Re: Samsung UE55MU6120K Boot loop with backlight no video

                  Originally posted by Diah
                  mask only the LVDS on the top of MB.... from Top count 11 pins and mask 9 pins.. it can be too from top start from 10 or 9 try you will have working TV at least but not perfect

                  by the way we have in forum digram where to mask on NU... MU will be same way just 1.2 more or less...
                  I have already covered the pins that lotas told me, can you name other pins other than his? honestly I don't think much will change since the TV keeps restarting with 2 connected flats

                  Comment

                  • fanaticgames
                    Senior Member
                    • May 2017
                    • 138
                    • italy

                    #49
                    Re: Samsung UE55MU6120K Boot loop with backlight no video

                    Originally posted by Diah
                    mask only the LVDS on the top of MB.... from Top count 11 pins and mask 9 pins.. it can be too from top start from 10 or 9 try you will have working TV at least but not perfect

                    by the way we have in forum digram where to mask on NU... MU will be same way just 1.2 more or less...
                    you mean in this area?
                    Attached Files

                    Comment

                    • Diah
                      Badcaps Legend
                      • Feb 2013
                      • 6343
                      • Germany

                      #50
                      Re: Samsung UE55MU6120K Boot loop with backlight no video

                      Originally posted by fanaticgames
                      you mean in this area?
                      NO
                      i linked before lotas photo... its for LVDS which are on the top of MB... and as lotas remarked... i give you other remark to count from the top 11 pins and start masking.

                      Comment

                      • lotas
                        Badcaps Legend
                        • Jan 2016
                        • 4459
                        • Russia

                        #51
                        Re: Samsung UE55MU6120K Boot loop with backlight no video

                        Sometimes it helps in some situations to reduce the VGH voltage to the panel and the reboot stops.

                        Comment

                        • Diah
                          Badcaps Legend
                          • Feb 2013
                          • 6343
                          • Germany

                          #52
                          Re: Samsung UE55MU6120K Boot loop with backlight no video

                          blue color
                          Attached Files

                          Comment

                          • lotas
                            Badcaps Legend
                            • Jan 2016
                            • 4459
                            • Russia

                            #53
                            Re: Samsung UE55MU6120K Boot loop with backlight no video

                            CN1802_UT (USI-T RIGHT) and CN1801_UT (USI-T LEFT)
                            Attached Files

                            Comment

                            • fanaticgames
                              Senior Member
                              • May 2017
                              • 138
                              • italy

                              #54
                              Re: Samsung UE55MU6120K Boot loop with backlight no video

                              Originally posted by Diah
                              blue color


                              ok, I understand, I'll try like this then, leaving the other flat free
                              Last edited by fanaticgames; 02-19-2023, 04:50 PM.

                              Comment

                              • fanaticgames
                                Senior Member
                                • May 2017
                                • 138
                                • italy

                                #55
                                Re: Samsung UE55MU6120K Boot loop with backlight no video

                                Originally posted by lotas
                                CN1802_UT (USI-T RIGHT) and CN1801_UT (USI-T LEFT)
                                The pinout is clear, first I covered exactly the ckv area, first right and then left but nothing has changed
                                Last edited by fanaticgames; 02-19-2023, 04:51 PM.

                                Comment

                                • PaolinaSparks
                                  New Member
                                  • Feb 2023
                                  • 4
                                  • Germany

                                  #56
                                  Re: Samsung UE55MU6120K Boot loop with backlight no video

                                  Hi fanaticgames,

                                  i had the same error.
                                  Please try to block only the CKV lines without the STVP line. So the pins 12-19 on the left cable(CN1801). You have to work very precisely, preferably with a microscope. Do not block any pins on the right cable. Connect both cables and test if there is a picture.

                                  If there is no picture, you block the CKV lines without STVP on the right cable. So the pins 76-83 on the right cable(CN1802). Don't block anything on the left cable. Reconnect both cables and test. If an image comes up in one of the two attempts, we'll see what's next.

                                  Comment

                                  • fanaticgames
                                    Senior Member
                                    • May 2017
                                    • 138
                                    • italy

                                    #57
                                    Re: Samsung UE55MU6120K Boot loop with backlight no video

                                    Originally posted by PaolinaSparks
                                    Hi fanaticgames,

                                    i had the same error.
                                    Please try to block only the CKV lines without the STVP line. So the pins 12-19 on the left cable(CN1801). You have to work very precisely, preferably with a microscope. Do not block any pins on the right cable. Connect both cables and test if there is a picture.

                                    If there is no picture, you block the CKV lines without STVP on the right cable. So the pins 76-83 on the right cable(CN1802). Don't block anything on the left cable. Reconnect both cables and test. If an image comes up in one of the two attempts, we'll see what's next.
                                    I'll try later and update the status here

                                    Comment

                                    • fanaticgames
                                      Senior Member
                                      • May 2017
                                      • 138
                                      • italy

                                      #58
                                      Re: Samsung UE55MU6120K Boot loop with backlight no video

                                      Originally posted by PaolinaSparks
                                      Hi fanaticgames,

                                      i had the same error.
                                      Please try to block only the CKV lines without the STVP line. So the pins 12-19 on the left cable(CN1801). You have to work very precisely, preferably with a microscope. Do not block any pins on the right cable. Connect both cables and test if there is a picture.

                                      If there is no picture, you block the CKV lines without STVP on the right cable. So the pins 76-83 on the right cable(CN1802). Don't block anything on the left cable. Reconnect both cables and test. If an image comes up in one of the two attempts, we'll see what's next.
                                      nothing changes, it always restarts, i guess the ckv lines have nothing to do with it at this point
                                      Attached Files

                                      Comment

                                      • fanaticgames
                                        Senior Member
                                        • May 2017
                                        • 138
                                        • italy

                                        #59
                                        Re: Samsung UE55MU6120K Boot loop with backlight no video

                                        Originally posted by Diah
                                        blue color
                                        Nothing has changed

                                        I masked both 10 pins and 9 consecutive pins
                                        Attached Files
                                        Last edited by fanaticgames; 02-21-2023, 12:02 PM.

                                        Comment

                                        • Davi.p
                                          Badcaps Legend
                                          • Sep 2009
                                          • 4266
                                          • Italy - Milan

                                          #60
                                          Re: Samsung UE55MU6120K Boot loop with backlight no video

                                          Now that we have listen to the others would you like to follow my advice? what do you think?

                                          Comment

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