Samsung UE55MU6120K Boot loop with backlight no video

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  • Diah
    Badcaps Legend
    • Feb 2013
    • 6343
    • Germany

    #21
    Re: Samsung UE55MU6120K Boot loop with backlight no video

    Originally posted by lotas
    Do not try to supply 12v anywhere, otherwise you will completely kill your panel and motherboard! Check with a multimeter for resistance these leads on the protective diode assemblies relative to gnd.
    +10

    Originally posted by Davi.p
    inject 12v on the 15v line, prepare to remove it when you see something wrong, better if you increase current slowly..
    could you please stop this stupid suggestion..

    as Lotas said ESD diode... but if one shorted.. you will have cell shorted.. the solution block all ckv from the top LVDS socket at MB side. other wise this is rubbish Panel.

    Comment

    • Davi.p
      Hobbist
      • Sep 2009
      • 4264
      • Italy - Milan

      #22
      Re: Samsung UE55MU6120K Boot loop with backlight no video

      Diarrhea don't bother me ok? So now you must keep a lesson on why this is dangerous.. we listen..

      Comment

      • nomoresonys
        Badcaps Legend
        • Jan 2013
        • 12076
        • U.S.

        #23
        Re: Samsung UE55MU6120K Boot loop with backlight no video

        2 of the best professional techs here just advised against it and stated what will happen if you do that, so WHAT don't you understand about it davipee.

        Comment

        • fanaticgames
          Senior Member
          • May 2017
          • 138
          • italy

          #24
          Re: Samsung UE55MU6120K Boot loop with backlight no video

          Originally posted by lotas
          Do not try to supply 12v anywhere, otherwise you will completely kill your panel and motherboard! Check with a multimeter for resistance these leads on the protective diode assemblies relative to gnd.
          just check that they are not shorted? because I had already tested in continuity mode

          Comment

          • fanaticgames
            Senior Member
            • May 2017
            • 138
            • italy

            #25
            Re: Samsung UE55MU6120K Boot loop with backlight no video

            Originally posted by Diah
            +10


            could you please stop this stupid suggestion..

            as Lotas said ESD diode... but if one shorted.. you will have cell shorted.. the solution block all ckv from the top LVDS socket at MB side. other wise this is rubbish Panel.
            even if i want to do it as individual ckv lines? on the motherboard I don't see any ckv indication
            Attached Files

            Comment

            • fanaticgames
              Senior Member
              • May 2017
              • 138
              • italy

              #26
              Re: Samsung UE55MU6120K Boot loop with backlight no video

              I don't know if it can be useful as information but someone has already repaired or attempted to repair this motherboard in the past because this component had its soldering redone (I don't know if it was changed or just re-soldered)
              Attached Files

              Comment

              • Davi.p
                Hobbist
                • Sep 2009
                • 4264
                • Italy - Milan

                #27
                Re: Samsung UE55MU6120K Boot loop with backlight no video

                to make things short, locate on MB two test points named T-RDY1 , T-RDY3, join them, in this way protection is disabled, now turn on tv and watch on to the screen's small boards if something gets hot or smokes, prepare to turn off tv rapidly, hope that there is a cap or diode in a half short state..

                Comment

                • lotas
                  Badcaps Legend
                  • Jan 2016
                  • 4458
                  • Russia

                  #28
                  Re: Samsung UE55MU6120K Boot loop with backlight no video

                  Points T-RDY1, T-RDY3 do not disable protection, they are intended for something else.

                  Comment

                  • fanaticgames
                    Senior Member
                    • May 2017
                    • 138
                    • italy

                    #29
                    Re: Samsung UE55MU6120K Boot loop with backlight no video

                    Originally posted by Davi.p
                    to make things short, locate on MB two test points named T-RDY1 , T-RDY3, join them, in this way protection is disabled, now turn on tv and watch on to the screen's small boards if something gets hot or smokes, prepare to turn off tv rapidly, hope that there is a cap or diode in a half short state..
                    but there is no way to make a uart connection to the motherboard via usb serial ttl to understand the reason for the reboot, before reaching these extreme attempts? on consoles like ps4 or phones it's useful, on tv's i don't see many arguments about this

                    Comment

                    • lotas
                      Badcaps Legend
                      • Jan 2016
                      • 4458
                      • Russia

                      #30
                      Re: Samsung UE55MU6120K Boot loop with backlight no video

                      The UART is locked in the firmware itself.

                      Comment

                      • lotas
                        Badcaps Legend
                        • Jan 2016
                        • 4458
                        • Russia

                        #31
                        Re: Samsung UE55MU6120K Boot loop with backlight no video

                        When you disconnect which cable (left or right), does the TV stop overloading?

                        Comment

                        • fanaticgames
                          Senior Member
                          • May 2017
                          • 138
                          • italy

                          #32
                          Re: Samsung UE55MU6120K Boot loop with backlight no video

                          Originally posted by lotas
                          When you disconnect which cable (left or right), does the TV stop overloading?
                          this is what i'm trying to explain from the beginning, i recap:

                          (with TV off)

                          I turn on the TV only with the left flat connected and it turns on

                          I turn on the TV only with the right flat connected and it turns on

                          I turn on the TV with both flats connected and it goes on and off endlessly

                          same thing even if I disconnect the flats with the TV on, just disconnect any one and it stays on

                          the problem occurs only when both flats are connected

                          Originally posted by lotas
                          The UART is locked in the firmware itself.
                          Damn
                          Last edited by fanaticgames; 02-19-2023, 09:09 AM.

                          Comment

                          • Davi.p
                            Hobbist
                            • Sep 2009
                            • 4264
                            • Italy - Milan

                            #33
                            Re: Samsung UE55MU6120K Boot loop with backlight no video

                            Lotas i have tested it on a Panasonic with Samsung panel, the image appears and stays on with many artifacts and a coil starts to heat on tcon.
                            Fanaticgames, there's no need of the uart, the fault is in the screen, this is clear for who has experience enough, the uart is possible maybe but it's a very long process to enable it..

                            Comment

                            • lotas
                              Badcaps Legend
                              • Jan 2016
                              • 4458
                              • Russia

                              #34
                              Re: Samsung UE55MU6120K Boot loop with backlight no video

                              Originally posted by fanaticgames
                              this is what i'm trying to explain from the beginning, i recap:

                              (with TV off)

                              I turn on the TV only with the left flat connected and it turns on

                              I turn on the TV only with the right flat connected and it turns on

                              I turn on the TV with both flats connected and it goes on and off endlessly

                              same thing even if I disconnect the flats with the TV on, just disconnect any one and it stays on

                              the problem occurs only when both flats are connected



                              Damn
                              It's clear, now put a jumper between T-RDY1 and T-RDY3 (imitation of panel connection) and check also with the loops disconnected (with left and right).

                              Comment

                              • fanaticgames
                                Senior Member
                                • May 2017
                                • 138
                                • italy

                                #35
                                Re: Samsung UE55MU6120K Boot loop with backlight no video

                                Originally posted by lotas
                                It's clear, now put a jumper between T-RDY1 and T-RDY3 (imitation of panel connection) and check also with the loops disconnected (with left and right).

                                jumper done, it works
                                Last edited by fanaticgames; 02-19-2023, 12:44 PM.

                                Comment

                                • lotas
                                  Badcaps Legend
                                  • Jan 2016
                                  • 4458
                                  • Russia

                                  #36
                                  Re: Samsung UE55MU6120K Boot loop with backlight no video

                                  T-RDY1 and T-RDY3
                                  Attached Files

                                  Comment

                                  • fanaticgames
                                    Senior Member
                                    • May 2017
                                    • 138
                                    • italy

                                    #37
                                    Re: Samsung UE55MU6120K Boot loop with backlight no video

                                    Originally posted by lotas
                                    T-RDY1 and T-RDY3
                                    yes, jumper done, the tv doesn't restart and works, so it's definitely the faulty panel

                                    EDIT

                                    I used this, isn't he?
                                    Attached Files
                                    Last edited by fanaticgames; 02-19-2023, 12:50 PM.

                                    Comment

                                    • fanaticgames
                                      Senior Member
                                      • May 2017
                                      • 138
                                      • italy

                                      #38
                                      Re: Samsung UE55MU6120K Boot loop with backlight no video

                                      now I have connected them correctly and the tv keeps restarting all the time, so the motherboard is bad??
                                      Attached Files

                                      Comment

                                      • lotas
                                        Badcaps Legend
                                        • Jan 2016
                                        • 4458
                                        • Russia

                                        #39
                                        Re: Samsung UE55MU6120K Boot loop with backlight no video

                                        I don’t know, it’s not clear where, in one place there is a point, and its inscription in another, now on which half is the defect in the matrix?
                                        If the cable is inserted one of a kind, is there also a reboot?
                                        Last edited by lotas; 02-19-2023, 01:04 PM.

                                        Comment

                                        • fanaticgames
                                          Senior Member
                                          • May 2017
                                          • 138
                                          • italy

                                          #40
                                          Re: Samsung UE55MU6120K Boot loop with backlight no video

                                          Originally posted by lotas
                                          I don’t know, it’s not clear where, in one place there is a point, and its inscription in another, now on which half is the defect in the matrix?
                                          If the cable is inserted one of a kind, is there also a reboot?
                                          at the point I indicated it does not restart, at the point you indicated it restarts, the flats are disconnected I have not tried to connect them

                                          from the tests I did yesterday by putting the tape on the left side flat it didn't go out but you couldn't see anything anyway
                                          Last edited by fanaticgames; 02-19-2023, 01:37 PM.

                                          Comment

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