your VGA and RCA\Svideo connections are all analog. DVI is digital, so I'm not sure how it would look.
Also, remember, that your TV can only display limited resolutions. So if your notebook is configured with a resolution that the display cannot present, then you won't see the image. This is also true with the refresh rates.
TV's generally aren't flexible with resolutions and refresh rates like computer monitors. This is because they're traditionally designed to work with fixed equipment, like DVD players, etc. Computer monitors must support a very wide range of settings.