How to fix my samsung 32'LCD tv?

my samsung 32'LCD tv has broken bought a month ago and is just sitting there. Unfortunately i was told by random people its not worth fixing, though i would love to be able to do it myself. The symptoms are that when i turn it on there is no picture but still sound, i have tried changing the source and channels and leaving it switched off for days. Presumably the backlight has broken, so i would appreciate if anyone could tell me how to fix it and what would the cost be