Why don't U try Different Drivers. Drivers from Coolbits work well for Tv-out functions, Give it a try. http://rootshell.be/~h4ck3d/
. Even try omega Drivers from omegadrivers.net. Make Sure u are using quality cables, sometimes Those bundled with Product are not of High Quality, suggest buying a Good one, They are very cheap. By the way, what connection on the TV are you using? I'm Using RCA and it Works Fine. Also Make sure in the Nview Display Settings that your colour is Properly adjusted for the TV device, especially check the saturation slider.