Well, the cat's out of the bag with televison - it isn't really just entertainment, it is entrainment. Tuning into the idiot box actually creates hypnotic states in the viewer. Both the images and sound act as signals that lead the passive, relaxed viewer into altered states of consciousness.
So television, or more precisely the tele-vid-audio medium, can be used to induce brain-change in the recipients of the signal.
There is nothing wrong with your television set. Do not attempt to adjust the picture. We are controlling transmission. If we wish to make it louder, we will bring up the volume. If we wish to make it softer, we will tune it to a whisper. We will control the horizontal. We will control the vertical. We can roll the image, make it flutter. We can change the focus to a soft blur or sharpen it to crystal clarity. For the next hour, sit quietly and we will control all that you see and hear. We repeat, there is nothing wrong with your television set.