POLAROID TDA-03211C Backlight issue

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  • NickLoC
    Senior Member
    • Jan 2013
    • 80
    • USA
    #1

    POLAROID TDA-03211C Backlight issue

    Ok so I am working on a POLAROID TDA-03211C. Backlight issues. Recapped the PSU board. Replaced all caps, larger ones were blown. Still backlight will not stay on and red light on PSU flashes red. Thanks to these forums I checked the circuit board inside the lcd panel itself where the ccfl lamps solder into. And sure enough near the top on one of the boards where the high voltage wire from the PSU board connects, there had been arcing and it burned out a ceramic cap and burned the trace and made a hole in the board. My question is, can I bypass the traces on the board with wire? If so what kind? I know this is high voltage, but the solder traces on the board were not that beefy. I have replacement ceramic caps as well. Another question is why did this happen in the first place? My theory is bad solder connection for the ceramic caps lead to arcing against the metal frame of the lcd panel. What do you think?
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    • kevinm34232
      Badcaps Legend
      • May 2012
      • 1884
      • USA
      #2
      Re: POLAROID TDA-03211C Backlight issue

      Budm had same issue with one:
      https://www.badcaps.net/forum/showth...ement+FLX-3210

      I have an Element that is having same problems Im about to open up the panel aswell since everything looks good on the PS.

        Comment

        • NickLoC
          Senior Member
          • Jan 2013
          • 80
          • USA
          #3
          Re: POLAROID TDA-03211C Backlight issue

          Thanks for the reply. I plan on replacing all the ceramic caps now. Still need to know how to best bypass the burned circuit board traces.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: POLAROID TDA-03211C Backlight issue

              You can use magnet wire (enamel coated wire), what ever you do, make sure to clean the board real well with Acetone or Alcohol. It will arc like crazy if there is any contamination or carbon traces due to high voltage arcing. I had to open my panel twice and ending up using Silicone RTV to coat on the cap and wire exposed solder pads.
              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

                • NickLoC
                  Senior Member
                  • Jan 2013
                  • 80
                  • USA
                  #5
                  Re: POLAROID TDA-03211C Backlight issue

                  Cool. So the RTV can be used to insulate? Could I use regular 16 gauge zip wire? or would that not be thick enough?

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA
                      #6
                      Re: POLAROID TDA-03211C Backlight issue

                      It is high voltage low current, the wire used for the lamps are 22~24AWG with silicone insulation.
                      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

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