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There are two possible things, either Cx board or display panel issue.Please check bottom of rear of panel, you will see three long boards (c1, C2 and C3) mounted horizontally across the bottom of screen and each board covers 1/3 of screen so check the line on screen landing at bottom to swap that C board which will help to resolve the issue or yu would be looking at defective display panel.Please check following attach image to view bard location in TV which will help to find C1, C2 and C3 boards in TV.
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It could also be A Board problem, please clean the flat ribbon cable contacts runs between C board and A Board.