it seem like capacitor is gone, as it is obvious that you do have limited knowledge of the tv, i would suggest sending it to the workshop, most aoc tv have two or three year warranty, you can check they warranty on this site:
http://us.aoc.com/support/warranty
select product and then model number and follow instructions, if it is still under warranty - your problem is solved, fill online form and that will be that, in most countries they even organise pick-up.
if it is out of warranty, on this same site you can find recommended repairer.
hope this will help you solve the problem, do not forget to vote...