I know this has been asked a few times, but even after a search I can't quite work it out. I tired connecting the red, white and yellow leads directly into my amp yesterday, expecting it to deliver both picture and audio, but I got nothing. I've read that the red and whute cables need to go into the amp, and the yellow into the TV, but how is it suppose to reach the back of the TV? I expect I need to but some sort of extension lead? Also, read there is some benefit by connecting via a component cable?