You're pulling out just the frame first and not the frame and the TV together, right? Once you get the screws out, the frame should come straight out. The "wings" on the frame slide back between the TV and the box. If the frame moves 2", then the only thing holding it should be friction.
After you get the frame out, there are a couple of wood blocks screwed into place that hold the TV. After removing the blocks, lift out the TV. Be careful - it weighs almost 70 lbs.
is a link to our blog post where I replaced the front TV on our '05 Allegro Bay. The front box should be similar to your '06 Phaeton. I wish I had more pics of removing the old TV because the question comes up frequently.