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.
Search the site by type "
line fault", in the "
Search box at the top right of the display window of the Homepage" to get gathered related posts.
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