Tow possibilities. [1] The LVDS cable (the flat cable that connects between T'Con and LCD panel) loose contact at its connection sockets. Re-insert this very carefully, and check. [2] Fault to T'Con board itself. If so it should be replaced. If you wish to get some details; check the site linked here.
Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
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