Hi.
Just a thought....
TV usually have several inputs, did you remember to check what input the TV read,
or swap the incoming source at the TV to the connected line in?
Also some cables and adapters have half and not full duplex, but if that
is something that matters in your case, I have no knowledge about.
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Cheers 🥂
GJ
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"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)