TCL 55US57 Bad Tcon Or Bad Panel Boards

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  • Michale32086
    New Member
    • Nov 2011
    • 1453
    • USA
    #1

    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
    Tags: None
    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12081
      • U.S.
      #2
      Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

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

        Comment

        • Michale32086
          New Member
          • Nov 2011
          • 1453
          • USA
          #3
          Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

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

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #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

                • Michale32086
                  New Member
                  • Nov 2011
                  • 1453
                  • USA
                  #5
                  Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                  Originally posted by budm
                  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

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA
                      #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

                        • Michale32086
                          New Member
                          • Nov 2011
                          • 1453
                          • USA
                          #7
                          Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

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

                          1600 Mohms +/- 10-20ish
                          Attached Files

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA
                              #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

                                • Michale32086
                                  New Member
                                  • Nov 2011
                                  • 1453
                                  • USA
                                  #9
                                  Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                                  Originally posted by budm
                                  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 MΩ 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

                                    • nomoresonys
                                      Badcaps Legend
                                      • Jan 2013
                                      • 12081
                                      • U.S.
                                      #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

                                        • Michale32086
                                          New Member
                                          • Nov 2011
                                          • 1453
                                          • USA
                                          #11
                                          Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                                          Originally posted by nomoresonys
                                          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

                                            • nomoresonys
                                              Badcaps Legend
                                              • Jan 2013
                                              • 12081
                                              • U.S.
                                              #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

                                                • Michale32086
                                                  New Member
                                                  • Nov 2011
                                                  • 1453
                                                  • USA
                                                  #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

                                                    • nomoresonys
                                                      Badcaps Legend
                                                      • Jan 2013
                                                      • 12081
                                                      • U.S.
                                                      #14
                                                      Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                                                      Probably all the ones that start with C.

                                                        Comment

                                                        • Michale32086
                                                          New Member
                                                          • Nov 2011
                                                          • 1453
                                                          • USA
                                                          #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

                                                            • Michale32086
                                                              New Member
                                                              • Nov 2011
                                                              • 1453
                                                              • USA
                                                              #16
                                                              Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                                                              Originally posted by nomoresonys
                                                              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

                                                                • Michale32086
                                                                  New Member
                                                                  • Nov 2011
                                                                  • 1453
                                                                  • USA
                                                                  #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

                                                                    • nomoresonys
                                                                      Badcaps Legend
                                                                      • Jan 2013
                                                                      • 12081
                                                                      • U.S.
                                                                      #18
                                                                      Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

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

                                                                        Comment

                                                                        • Michale32086
                                                                          New Member
                                                                          • Nov 2011
                                                                          • 1453
                                                                          • USA
                                                                          #19
                                                                          Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

                                                                          OK... A probing I will go..

                                                                            Comment

                                                                            • nomoresonys
                                                                              Badcaps Legend
                                                                              • Jan 2013
                                                                              • 12081
                                                                              • U.S.
                                                                              #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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