Fine horizontal line are on whole screen.....if the color of picture is dark they barely show up....lighter colors they seem to show up more....this has been going on for over 2 years....once in awhile the picture will become a little distorted and it usually fixes it self....sometimes I have to turn tv offand then back on to fix distortion but the fine horizontal lines stay on screen could this be a bad led driver board? M3d550kd is model #
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