My FIL's A9F will only play Audio through the TV. 

He has a Sony STN-D1060 Amp, and there is a 4K HDMI cable which runs from the HDCP 2.2 output (A I think) to the HDMI 3 Input on the TV, and in the TV I set the Audio to 'audio system'. It's set to HDMI 3 in there (can't recall the exact place) but we get no Audio.

Anyone have any experience and can point me in the right direction?

Cheers