Hi after reading many postings, I could successfully managed to use S-Video from my Dell Latitude D600.
It originally had Mobility Radeon 9000. I 've downloaded the Omega display driver at http://www.driverheavendownloads.net/omegadrive.htm
Basically there are two things to remeber.
1. The video signals should be detected by TV automatically. If not, then we need to force the TV detection
2. Video plays only in one monitor, that is in primary monitor. So, we need to make the TV as primary monitor.
Navigate, Display->Settings -> Advanced ->Displays
Select TV as start, and select laptop monitor as stop (toggle with power-on/off icon for both these options).
There you go!