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please help me out,my samsung s2 glass was accidently dropped, i gave my mobile to the shopkeeper for glass replacement, now glass is fine but lcd colour quality is not good ,and i noted a dull spot on left center of the screeen . day by day the spot is increasing and covering the whole screen, spot is making sreen colour dull , and showing overlaping of previous menu. . please help me out what is wrong with my phone

Take your device back to the shopkeeper, maybe the lcd was damaged during the glass replacement work.