Have TV Questions? Ask a TV Technician
Hello and sorry you're having problems. In order to help, I need to ask for some more info.
1) What is the model number off of the back of the Main TV?
2) How do you receive broadcasts on the set (DirecTv, Charter, Comcast, DISH, etc.)?
3) What remote are you using when trying to change channels, and are you saying it's stuck on Ch. 7 and won't move off of it?
Any of the above info that you can provide will help me to help you.