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TCL 55US57 Bad Tcon Or Bad Panel Boards

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    TCL 55US57 Bad Tcon Or Bad Panel Boards

    Got a nice TCL in.. 55US57..

    I have dealt with a few of these, but there issues were backlights..

    This one, the backlights are fine, I just get no display at power up..

    I have found that, if I take off the right connector that goes from the TCON to the Panel Boards, I get display on the Left side of the TV...

    That tells me either it's a bad TCON (hope hope) or a bad left side panel board...

    If it's the panel board, it's likely unfixable..

    Is there a way to determine conclusively whether it's the TCON or Panel Board???

    Other than replacing the TCON...
    Attached Files

    #2
    Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

    What did you get when you did the other ribbon cable?

    Comment


      #3
      Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

      Originally posted by nomoresonys View Post
      What did you get when you did the other ribbon cable?
      Backlights.. no display on panel.. Sorry.. Meant to add that detail..

      Comment


        #4
        Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

        https://www.badcaps.net/forum/attach...1&d=1574193881
        Start checking the RESISTANCE of those MLCC on that tab bonding board of the bad side.
        Last edited by budm; 11-19-2019, 02:44 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


          #5
          Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

          Originally posted by budm View Post
          https://www.badcaps.net/forum/attach...1&d=1574193881
          Start checking the RESISTANCE of those MLCC on that tab bonding board of the bad side.
          Awesome.. Thanx...

          Uh.. Forgive my ignorance. Can you circle an MLCC??

          Comment


            #6
            Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

            Those brown tan caps.
            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


              #7
              Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

              Originally posted by budm View Post
              Those brown tan caps.
              Checked the first three.. Marked..

              1600 Mohms +/- 10-20ish
              Attached Files

              Comment


                #8
                Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                You need to check all of them.
                BTW, you meter can read 1600 Mega Ohms?
                Last edited by budm; 11-19-2019, 04:25 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


                  #9
                  Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                  Originally posted by budm View Post
                  You need to check all of them.
                  Will do... As soon as I get back to the shop.. Is that a normal correct reading for those?? 1600 +/-??


                  BTW, you meter can read 1600 Mega Ohms?
                  My meter says which I took to mean Mega Ohms

                  I'll get right back on it when I get to the shop..

                  Thanx for the replies..

                  Comment


                    #10
                    Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                    That might be a match, looks like it has the same part number: https://www.ebay.com/itm/4T-TCN550-C...cAAOSwzztdOxRt

                    Comment


                      #11
                      Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                      Originally posted by nomoresonys View Post
                      That might be a match, looks like it has the same part number: https://www.ebay.com/itm/4T-TCN550-C...cAAOSwzztdOxRt
                      Yea, the one I have is a 1-C-7... I found one on EBAY, but want to confirm that the TCON will fix it.. On the other hand, it's only about $25..

                      Comment


                        #12
                        Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                        Looks like they both work, I thought they looked very similar: https://www.shopjimmy.com/tcl-4t-tcn...-con-board.htm
                        Last edited by nomoresonys; 11-20-2019, 06:30 AM.

                        Comment


                          #13
                          Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                          Yea, I am guessing it's likely a firmware difference..

                          Just got to the shop, will test those MLCCs ..

                          Question, are the MLCCs ALL of the tan caps?? Or just the larger ones I marked??

                          Comment


                            #14
                            Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                            Probably all the ones that start with C.

                            Comment


                              #15
                              Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                              OK, getting some different readings now..

                              With the + probe on the lower and the - probe on the upper, I get 7.5K +/-

                              With the - probe on the lower and the + probe on the upper, I get 10.05K +/-
                              Attached Files

                              Comment


                                #16
                                Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                                Originally posted by nomoresonys View Post
                                Probably all the ones that start with C.
                                That's a lot of probing..

                                Thanx
                                Last edited by Michale32086; 11-20-2019, 07:27 AM.

                                Comment


                                  #17
                                  Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                                  Do you have an idea of what I am looking for??

                                  Like a 0.0 reading means that cap is dead or something like that??

                                  Comment


                                    #18
                                    Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                                    I think 0 is dead short and too low is bad too.

                                    Comment


                                      #19
                                      Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                                      OK... A probing I will go..

                                      Comment


                                        #20
                                        Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                                        Dog did it like this, he got pretty fancy and used both diode and ohm modes, the showoff, lol, I could use a pair of those Superman glasses he's got there: https://www.youtube.com/watch?v=jLd6QO7Z7m4
                                        Last edited by nomoresonys; 11-20-2019, 08:10 AM.

                                        Comment

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