What is the refresh rate set to in the secondary monitor properties? Also check the back of the TV as it may have a refresh rate setting listed (not always but some do). For TV's it should be either 60 or 75 Hz.
You are going from S-Video on card to S-Video into a converter then RCA from converter to TV RCA. Is this correct? Have you tried an S-Video straight from card to an RCA (cable making conversion) into TV?
I sure wish you could draw a diagram of your system and attach it to a post. It would make this a bit easier.
