Nov 15, 2017
I am having the same exact issue.
I have the Bose Soundtouch 520, they were connected through my HDMI ARC on my Sharp Aquos tv - everything was working completely fine, CEC detected and everything. Yet suddenly a week ago, it decided to stop functioning completely and factory resets on both television and Bose system have no avail. I've tested every facet of everything and it all works fine separately, but when placed together, it does not work.
HDMI cables/HDMI inputs/television/speakers - everything functions properly but devices cannot detect CEC anymore and no matter how I fiddle with settings, the ARC just no longer functions!