I have a Samsung 55" TV Smart HD
I had to select SOURCE every time I switched TV on
which was annoying. I phoned Samsung and it is a known problem, there is a workaround though:-
Select HOME, select SETTINGS, select BROADCASTING.....then select Auto tuning...move to the right hand side, and switch Broadcasting OFF
This one tip will help you sleep better tonight
A few seconds are all you need to get a better night's rest.