You can work around this by either setting a fake gateway in a static IP configuration, or configuring your DHCP server to give a fake gateway to requests comin

You can work around this by either setting a fake gateway in a static IP configuration, or configuring your DHCP server to give a fake gateway to requests coming from the TV's MAC address. By "fake gateway" I mean a non-existing IP on your LAN: that way, no outgoing request from the offending MAC address will ever get out to the public Internet.