Does the smart flat LCD TV support digital TV viewing?

Smart TV is now basically supported. Why? Because although the content obtained by smart TV is basically through the Internet, TV still retains the traditional digital TV and cable TV interfaces: av (or HDMI interface) and RF interface, as shown in the following figure:

Therefore, as long as the above interface is reserved behind the TV, it can support connecting the set-top box to watch digital TV and even cable TV.