I have the same problem.
But I’m using a Apple tv 4, and the tv is connected to a Beosound Ouverture. The problem is exactley the same to my setup. The tv is also 15 years.
Did you find a solution?
Best Regards
Adam
Favourite Product: Beovision Avant, Beolab Penta, Beolab 3, Ouverture
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