Facing TV Problems? Ask a TV Technician.
Hello, Sorry you're having problems. The optical output is processed digitally in the set, and the analog- well of course is analog. If the optical stopped (no connections have changed) yet the analog still works, then it's generally caused by a fault on the Mainboard of the TV (which is a replaceable component). That said, have you gone into the audio settings in the set, and performed a Reset?
Also, are you 100% certain that whatever you're connecting the other end of the optical cable "To" is not the root cause of the problem (I'm assuming it's connected to a Home Theater receiver, soundbar, etc.)?
Also, the brand and model of the receiver will help, as some units have processor reset steps that can help fix this. Please reply back with some more info so I can help you.
I'm here to help you but two way communication is needed to sort what the actual root cause of the problem is. Can you send me a reply back and let me know where you're at right now?