round shape big dot on screen

round shape big dot on screen I had purchase one LG 42" LED TV from Khosla Electronics Pvt. Ltd.(Kolkata Nagerbazar branch) on 9th June 2014. Invoice number is 3324/1415/02145. Make is LG 16108000004328 and Model no is 42LB5610. ATR 405PLVC008415. ANSWERS:
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