Parents control the TV. If a parent cannot do this, then the parent has a bigger problem and should seek guidance.
Everybody uses the television as a babysitter. We know it's wrong, but we do it anyway. So, at the very least, keep an eye on what your children are watching. Be familiar with TV schedules and watch at least one episode of a favourite programme so you are at least aware of the values, violence, sexual content of the programme.
Help your child choose programmes that are worthwhile. Guide your child towards educational programmes and documentaries. Discuss these choices with your child and make a daily viewing schedule. You can always record programmes for later viewing.
Ideally, parents should watch TV with their children to help them process the information. Children cannot deal with a blur of images. They need space between programmes to process what they have seen. If a child sees a violent image, parents can limit damage by discussing the incident. Explain that most adults don't behave in this way and suggest non-violent ways of dealing with the problem.
Only the parent knows what is suitable viewing for an individual child's age and stage. Don't trust someone else's judgment. RTÉ schedules Young Adult (YA) programmes during what most would consider to be children's viewing time.
Communicating with your child about the plots of children's cartoons and dramas can be a good way of instilling parental values. Ask your child questions like: what TV character are you most like and why? If you were in the character's situation, what would you have done?
Your child may be watching too much TV out of habit. Resist turning the television on first thing Saturday mornings - you'd be surprised how quickly children with other alternative activities forget about the TV.