I avoid TV. I don't know if its sinful to watch it, but I think if you watch too much TV, stuff sinks into your mind that probably hinders your walk with God. Just think about what you see on dramas, soaps, sitcoms, etc. It doesn't even have to be blatant sex stuff or swearing to be anti-God. The people who write those shows are pushing products and a secular lifestyle that is fundamentally opposed to the Christian lifestyle. News...different. I personally find that reading my news online is better, anyway, because I can then do googling and see what's really going on (less bias when you get important stories from multiple sources...I particularly recommend The Guardian and BBC online).
Just my thoughts. Also, too much TV is kind of like a tranquilizer. It dulls the senses.