ive just bought a FULL HD TV LG 1080p 42" super dooper tv however when i got it home i was really dissapointed with the picture quality. i was expecting a real crisp clear picture however the picture is quite blocky especially when theres faces. and if theres text on the screen it looks like theres a shadow behind it! i have sky+ and dont want to pay for a hdtv+ box (or is that what i have to do?). is there anything i can do to make the picture perfect?