Madhan Kanagavel on Twitter: "So two working Yamaha receivers RX-V673 and RX-V675 fully bricked after applying the latest firmware update offered. Everything works except for no sound output! No reply from support.
Yamaha's four new AV receivers compared - CNET
Yamaha RX-V571 Home theater receiver with 3D-ready HDMI switching at Crutchfield
Yamaha RX-V571 7.1 HDMI Home Theater Surround Receiver - YouTube