I use Nero 6 to make DVD slideshows.
Shown on my TV the slides are fuzzy although I have an 8 megapixel camera. My prints are fine and my TV works fine.

What is the trick?

Try to play with the settings that you render out your dvd like see if your TV only supports 480i or 480p stuff like that but try to render it as 480p or more don't choose 480i or 720i or 1080i

480i - Wikipedia, the free encyclopedia