Hi.
I've just set up an entirely new system. I have an Onkyo Receiver (TX-SR252) as the central component.
The TV (Sony 55XD9305) is connected to the HDMI/ARC OUT connector on the receiver, using an ARC compatible HDMI lead, to the connector marked HDMI 4/ARC on the TV.
I also have a Humax FVP-4000T, connected to the SAT/CBL connector on the receiver.
I have enabled ARC on the receiver, and set the TV speaker setting to "Audio System".
My problem is this: when I start up the system (Onkyo first, then TV, in accordance with the Onkyo instructions), the TV sound comes through the receiver as it should for about 10 seconds. After that, the TV switches to its internal speakers, and even if I reselect "Audio System" I can get no sound.
If I turn on the Humax box, I get an "Audio System Active" message on the TV, and it works correctly from then on (without me switching to the Humax output). However, if I put the Humax back into standby, after 5 minutes, the TV reverts to its internal speakers again, with a "communication failure" message.
I'm struggling to think what settings I can change. I don't want to have to run an additional audio cable between the TV and the receiver, as space is really tight in the trunking from the receiver to the TV bracket on the wall.