It's usually driver boards, cables or the panel. These are consider non-user serviceable and if it's the panel, the cost is more than a new set. Reference http://www.samsungparts.com/Products/Parts_and_Accessories/PID-BN95-00424A.aspx?model=UN55D6000SHXZA
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Bob
Hi'
I have a Samsung UN40D6000. A few weeks ago started showing horizontal lines in shadowed block vertically. the lines are not affected if you change color settings or contrast. any help would be appreciated. The capacitors look good.

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