I can't imagine why your TV's controls wouldn't work. The only thing I can imagine is that your TV has some kind of "child proof" feature that prevents kids from messing up the controls and you may need to give it a PIN or use some other trick.
On some TVs, these controls control all inputs at the same time. On other TVs, each input gets it own settings. I know that has confused some people in the past. (ie: tuning up the contrast for one input may or may not affect the other inputs. If not, then you just turn up the contrast again for that input.)
