lg 47LW450U

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  • efwiofoi
    Senior Member
    • Nov 2013
    • 76
    • uk
    #1

    lg 47LW450U

    i have an lg 47LW450U lcd, ive replaced the main board after the old one was apparently damaged by a spark between the hdmi port and a laptop hdmi cable.

    the new board is working but every 2 to 3 seconds the brightness of the screen changes, dimm bright dim bright continuosly. its only a slight change and either setting would be ok if it stayed on one. ive reset the picture and settings. its doing this on any input or with no input connected. its like either the backlight level is changing or the screen contrast or brightness setting is changing, i think it is the screen setting not backlight. i have a plug in power meter thats not showing any change in power drawn.

    any idea what would cause this? thanks
    Tags: None
    • efwiofoi
      Senior Member
      • Nov 2013
      • 76
      • uk
      #2
      Re: lg 47LW450U

      ive noticed that there are some lines on the screen when its in the darker mode, so its looking like a panel problem or something similar.
      the panel is a lc470euf(sd)(f2) and the new board came from lc470euf(sd)(p1)
      would that be enough to cause compatibility issues?

        Comment

        • johnboy1313
          Badcaps Legend
          • Nov 2012
          • 1959
          • USA
          #3
          Re: lg 47LW450U

          Are you sure you got all of the cables seated correctly when you changed the main board?

            Comment

            • efwiofoi
              Senior Member
              • Nov 2013
              • 76
              • uk
              #4
              Re: lg 47LW450U

              i think they are but will double check. the funny thing is the change is in time not random, its exaclty 3 seconds dim, 3 seconds brighter. something is controlling it it seems, but what could cause it to do that.

                Comment

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