1. a tv (unless HD) will be a poor monitor because of reduced resolution.
2. You hooked up the convertor to VGA out, Then from the converter to what on the TV?
3. the converter is supposed to be used going to the video inputs of more modern TV's, but the computer display settings might not be compatible with the TV needs. Try lesser pixel settings 640x480 ?
4. why not just get a cheap used monitor?