Resetear la negociación HDMI:

HDMI HDCP reset
With all devices powered on, remove the two HDMI cables at both ends from the source device to the AVR and from the AVR to the TV.
Power off all devices and disconnect power cables to all devices.
Wait 10-15 minutes.
Reconnect HDMI and power cables to all devices.
Power on the devices in this order ... TV, wait a few secs, AVR, wait a few secs, and then source device (although this is the generally recommended order, in some instances, you may have better luck powering on the AVR first and then the TV, then the source last ... bottom line if it's still not working, try a different power on sequence).