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POLAROID TDA-03211C Backlight issue

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    #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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    #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

      #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

        #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

          #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

            #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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