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/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
Take it apart to see what the damage is to the panel and electronics in that corner it may just need a new panel or boards and connection replaced which can cost more than you are willing to pay
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