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Get rid of it! I started out with the small black smoky line, went to two horizontal line, , , , I now have a 10 " line half way across the screen in two places and the rest of the line is 4-6". Contact Samsung three times on line and they responded with " we do not understand the problem, please explain. Oh yeah, TV was 2.5 years old. Never will buy Samsung again.
First of all try, changing the input device to some other and see whether you see the same problem. Then connect your present input to a different TV and see. If you feel the input is ok, and it is a problem in the display, this is a case to be handled by a qualified service technician.
this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!