N.M.
Yes, a tv in the bedroom is a really bad idea. Studies have shown that kids with tvs in their bedrooms actually get less sleep and poorer quality sleep.
I would suggest that you use the same routine you used at your old house. Repeat it the same way every night. Make it a routine that encourages a "settling down." That means, take a warm bath, have a bedtime story and a cuddle. Make it a really nice time that you spend together.
Another way to encourage sleep is to make sure that he wakes up at the same time every morning. Keep him on a routine so his body will be ready for sleep at bedtime.
Also, eliminate naps, if you haven't already. If he is having trouble sleeping at night, he doesn't need a nap during the day. Try this website for bedtime ideas: http://keystosimpleliving.com/kids_bedtime.php