Open your graphic properties in your control panel with your S-video hooked up to the television, then see exactly what your displaying out through the s-video.
You ccan set your resolution on the 'second' monitor(television) correctly and/or go into your television settings and check to see if your t.v s-video connection is set up correctly(you have it). but aside from that, ,there shouldn't be any problems after you fine adjust to your television.
Problem with S-video cable 
Linear Mode
