Vizio M3D550SL

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  • tjmethod
    Senior Member
    • Jun 2013
    • 137
    • United States

    #1

    Vizio M3D550SL

    I've taken on fixing a Vizio M3D550SL for my dad that has backlights but no picture. Thinking the main board is the issue since the t-con is part of that board, I was lucky to find a one on ebay since it isn't manufactured anymore or available anywhere. It was supposedly from a smashed screen set guaranteed but after swapping it out, still backlights only. I read about similar problem being the backlight inverter but all seem to check out on the volt meter. I dont know if the backlight inverters are good how or how or if it would change the multimeter readings. There's no physical damage to the panel. I am now confused as to where to pinpoint the problem. Once I got the main board (well packaged), I saw a video where the guy replaced a regulater. This board only has 2 and the voltages are virtually the same as the original boards regulaters but that doesnt mean this very well could be the t-con section on this board having the same problem. I'm leaning towards this since the flashlight test shows nothing and could be a board with the same problem Any suggestions from the far more experienced would be great?
    Thanks, TJ
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Vizio M3D550SL

    The question is, do you see the screen glow or see the lights on the back side of the LCD panel in the dark room or not?
    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

    • tjmethod
      Senior Member
      • Jun 2013
      • 137
      • United States

      #3
      Re: Vizio M3D550SL



      Hey there bud I have not shut out the lights but when turning it on and the "vizio" bezel light turns from amber to the white, the LEDs light up on the front of the screen and appear to look toally normal. In the back of the panel every hole is lit up from the LEDs. I am guessing there is a difference between what looks like normal LED lights when turning on as oppsed to a glow lime you are mentioning? That will be the first thing I heck when I get home

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Vizio M3D550SL

        As long as you have backlights then the problem for not having pictures on the screen will be the main board or the panel. You can also try having one ribbon cable to the panel connected one at a time to see what happen.
        Pictures of the whole back side of the TV showing all the boards?
        Last edited by budm; 09-28-2016, 09:33 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

        • tjmethod
          Senior Member
          • Jun 2013
          • 137
          • United States

          #5
          Re: Vizio M3D550SL

          Will do as soon as I get in- thanks

          Comment

          • tjmethod
            Senior Member
            • Jun 2013
            • 137
            • United States

            #6
            Re: Vizio M3D550SL


            https://s15.postimg.org/6vo1mytl7/20160928_215243.jpg
            https://s18.postimg.org/waxlgofmh/20160928_215347.jpg
            https://s15.postimg.org/et8uvf3x7/20160928_220432.jpg
            https://s22.postimg.org/wtsrc5wf5/20160928_220459.jpg
            https://s12.postimg.org/uz1ursmql/20160928_220725.jpg
            https://s12.postimg.org/qwsf7ecul/20160928_220741.jpg

            Here are the pictures with the lights out and with the cable behind from behind the right side disconnected to the panel then with just the cable behind the left side disconnected. The screen appeared to be normal backlights with the lights out before disconnecting anything. When disconnecting the cable behind the left right side showed the screen split in half with vertical lines on the left and a white screen on the right. Once plugged back in and turning on I noticed that the a definate line between the 2 sides so I disconnected it again, cleaned it with alcohol and made sure it was seated perfect and it seem to look like normal backlights at that point but still a separation line and as if there was a vertical 'grain' that I hadn't noticed before. Appearance of the screen with only the cable behind the left side didn't change anything.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: Vizio M3D550SL

              It is one of those LCD panel that has the tab bonding on the bottom edge of the LCD panel which usually get damaged by the cleaning fluid that the customer spray on the screen directly instead of damping the cloth.
              That is what I suspected to what had happened to 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

              • tjmethod
                Senior Member
                • Jun 2013
                • 137
                • United States

                #8
                Re: Vizio M3D550SL

                Do you think there is any remedy or do you think the screen is smoked? Do you think carefully cleaning the boards and socmets with alcohol might work?
                Thanks again

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Vizio M3D550SL

                  You need to remove the LCD metal frame to get to the tab bonding boards and do the visual inspection to see if there is any corrosion damages to the bonding.
                  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

                  • tjmethod
                    Senior Member
                    • Jun 2013
                    • 137
                    • United States

                    #10
                    Re: Vizio M3D550SL

                    Ok so corrosion would be the culprit but with any luck it would be buildup of some type of cleaner. I'll be checking that when Iget in tonite.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Vizio M3D550SL

                      What happen is that the corrosion will eat away the fine traces, and parts.
                      Attached Files
                      Last edited by budm; 09-29-2016, 11:43 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

                      • tjmethod
                        Senior Member
                        • Jun 2013
                        • 137
                        • United States

                        #12
                        Re: Vizio M3D550SL



                        Well you pinpointed right to the source of fhe problem... there were 3 drivers on each board and the it was only one, the middle one on the right side board. I guess the panel is junk?
                        Thanks for all your help

                        Comment

                        • tjmethod
                          Senior Member
                          • Jun 2013
                          • 137
                          • United States

                          #13
                          Re: Vizio M3D550SL

                          Even though I cleaned it thoroughly woth alcohol, that only made it look like it wasn't corroded.

                          Comment

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