Do you have parental controls on the router?
Yes. But I turned them off. Didn't help.
Did you reset the connection on the smart TV after turning off the parental controls? Or were they never on?
Are other things connected to your wifi and working? Can you tell what the tvs ip address is ?
Could have too many devices connected at once. Trying switching off your computer and turn off your wifi on your phone.
Do you have wireless encryption?
Yes.
WPA/WPA2 or WEP?
Try turning it off (temporarily) and see if the TV connects.
Took to the internetz for help. Have you tried saving your smart TV's MAC address into the router?
Sounds like it is a problem with the TV then. Have you tried resetting it to factory defaults? Figure that you probably have.