My house has a Samsung Smart TV (dont remember its serial number) and it had a problem. When i click on Youtube app, it says "404 Not Found. The requested URL not found on this server." But when I watch Youtube on Internet, it still works normally. Can you guys tell my what the problem is and how to solve it? Sorry for my broken English!
Let's see if we can get this sorted for you. Could you tell us the full model code of the TV and the current software version? Go to Menu > Support > Contact Samsung, or alternatively, Home > Settings > Support > About This TV.