Solved! No Home theatre sound when set top box connected

Nov 16, 2018
I have sony home theatre with HDMI ARC and digital optical audio port to connect. My sony hd tv has also HDMI ARC and digital optical audio output port. Both are connected via HDMI ARC. All working fine.
But as I upgrade my HD set top box connected to tv via another HDMI port, home theatre stops producing sound. Though TV speaker can produce sound.

What is the solution please??
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