Have you checked your tv manufacturer's website to see if your tv can play movies from just a usb flash drive as most lcd tv's don't do that if this is what you mean. The usb slot on a TV is there mainly for updates for itself, although having said that there is a few that will let you play a slideshow of pictures from it.
Have a look online at LG's website typing in your tv's make model/serial number, it will definitely tell you.
A forum community dedicated to tech experts and enthusiasts. Come join the discussion about articles, computer security, Mac, Microsoft, Linux, hardware, networking, gaming, reviews, accessories, and more!