I have a Panasonic LED TV (1 yr old) and a Panasonic PT760 Home Theater. Both have Viera Link and they were both working fine. Also have DirecTV. I could turn on the DirecTV box and the TV and home theater would turn on fine. DirecTV remote controls HThtr sound/mute.
One day a couple weeks ago the home theater stopped turning on. Now it has to be turned on/off with its own remote. I've tried everything but no joy. I can turn it on manually with its own remote and it works OK, and sees the TV. But volume/mute can only be controlled by its own remote. Pain in the rear. I've tried resetting both the TV and HThtr back to factory defaults. Still nothing. I suspect the TV downloaded a firmware update and that caused the problem.
DirecTV HDMI out to TV HDMI #1
Home Thtr HDMI to TV HDMI #2 (ARC)
TV to Home Thtr Digital D-IN cable (toslink?)
Both TV and HThtr indicate Viera Link is ON
Any suggestions? Is the PT760 too old?