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A totally different setup but I had problems connecting my Cambridge Yoyo to my tv via the HDMI ARC when I first got it - was just as flaky as you're describing, could not get it to play through certain inputs & even then the volume sync was fucked - eventually solved it by disconnecting every single possible connector & power lead and leaving it for a while, then connected everything back up before switching it all back on again, started working perfectly - no lag, nothing, switches perfectly every time I change source now & volume sync is back - dunno what was up but that seemed to work.
mcJ78
@Brun
Appriciate it's a bit off-topic, but can anyone offer any suggestions on getting HDMI CEC/ARC to work properly?
Telly is a Samsung QE55Q7FAM and it's connected to a Yamaha RX-V673. Turning on the TV switches on the receiver ok but 90% of the time ARC doesn't work initially, I have to switch the receiver off and on again before it gets any audio. Even selecting the ARC input manually doesn't work, which suggests it's the TV not acually outputting anything. CEC behaves similarly, in that the TV remote doesn't control the receiver volume until the receiver has been power-cycled.
Recently swapped the generic HDMI cable for a specific 'high-speed' one in the hope that would improve things, but hasn't made any difference.
Most frustrating thing is that it has worked more reliably in the past, and still - occasionally - does now. Am left with the impression that this stuff is just generally flaky and I'll have to live with it.