If the TV doesn't have any controls on it to do that then you will need a replacement remote or a good universal remote like the Logitech Harmony. Many universal remotes may not have all the functions of the original remote.
If the TV doesn't have any controls on it to do that then you will need a replacement remote or a good universal remote like the Logitech Harmony. Many universal remotes may not have all the functions of the original remote.