Well, Lord Dalek is correct, going into the receiver first was not possible. The receiver is old, and does not have HDMI inputs to make this happen. In doing into some research, it seems like the Digital Optical cable can't be bad, because I still get sound. Not sure why this started last fall...
I have a Sony STR-DE997 7.1 receiver and a older 70" Vizio LED E700i-B3, connected via Digital optical cable. I have Frontier Fios STB, Apple TV, PS4, and Nintendo Switch connected to the TV using HDMI.
Since the battery on my UPS died (not sure if this is coincidence or not), I haven't been...