@Blumine1818
You asked:-
Could it be the HDMI arc input on the soundbar that is faulty?
to which the answer is no, as when you plug the 4K BluRay into the soundbar, you still get no audio, although the video goes to the TV OK, proving you have selected the correct input on the soundbar to play the disc, and yet you still get no audio, which in these circumstances would be played directly by the soundbar, with no ARC involved.
ARC only comes into play when the sound source is connected via the TV.
And that you get the video shown proves, at least, that video can go up the cable that the ARC audio comes down. And video should be going up that cable when you press Home; does that now work, or still not?
Getting audio from Demo mode is progress, anyway. It proves the soundbar can still make a noise when it wants to.
But I’m worried that reset apparently didn’t work; if you now get a video display when pressing Home, then it did work. But if still not, do that reset again, pushing both buttons simultaneously, and holding them in until either it does reset, or until at least 30 seconds has passed.
My favourite bedtime reading is a Sony product manual…
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