If I am understanding you right, I think you are confused about cable tv vs internet. Plugging a cable wire into a smart tv does not give it internet. And plugging a network wire with internet into a smart tv does not give it cable tv.
Assuming that you have cable tv and cable internet, and assuming that your cable company does not still include analog tv, then the kind of set up I would figure for you is:
1. Cable company cable comes into the house to a:
2. splitter that splits the cable at least into 2,
3. one goes to the modem, the other(s) go to SD/HD cable receiver(s).
4. the modem attaches with an ethernet cable to a router while the receiver(s) attach to the tv(s) with hdmi to give the tv(s) Television but no internet
5. the router connects through either wired (ethernet cables) or wireless wifi to your smart tv and HP computer. This gives the smart tv internet, but not cable tv
[if the smart tv does not have wifi and if you are not able to run network cables through your house, then you would need something like a Wireless Access Point to go wifi from the router to the WAP and then wired ethernet from the WAP to the smart TV]
6. you would also attach the computer to the smart tv with dvi or vga or hdmi, to be used as a monitor.
Edited by bludshot, 10 December 2014 - 07:53 PM.