Randy Alcorn goes after guidelines to keeping your TV a servant rather than a master. You can read the full post including the motivations he gives here.
These are the things he lists:
1. Keep track of how much time you spend watching.
2. Decide in advance how much TV to watch per week.
3. Use a schedule to choose programs for the week (perhaps at family time)— then stick to your choices.
4. Keep your television unplugged, store it in a closet, and/or put it in a remote part of the house .
5. Periodically “fast” from television for a week or a month. Notice the “cold turkey” effects.
6. Choose programs that uplift rather than undermine biblical values.
7. Use the “off” switch freely. If it’s wrong and you keep watching, you’re saying “I approve.”
8. Use the channel changer frequently. Even decent programs often have explicit commercial clips of the latest adultery-rape-murder-madstalker-child-kidnapper movies.
10. Don’t allow young children to choose their own programs—that’s the parent’s responsibility. As they get older, they can choose, but parents should always have veto power. Use it with sensitivity, but use it.
11. Don’t use television as a baby sitter. Provide healthy alternatives, such as reading, projects, play and interaction with parents, siblings, and friends.
12. Spend an hour reading Scripture, a Christian book or magazine, or doing a ministry for each hour you watch TV.
13. Consider dropping cable, Showtime, HBO, or any other service that you determine is importing ungodliness or temptation into your home.
14. If you find you can’t control it—or you’re tired of the battle—get rid of your television.