LH tv 75UD76 sound bar inactivity auto shut-off


Novice Member
My TV model 75UH76. I have Bose sound bar connected thru HDMI and headphones connected through optical cable. If I want to use headphones together with the speakers, the only setting option to use is "optical sound out with TV speakers". When I switch to this mode, the connected sound bar becomes inactive and makes the TV turn-off itself automatically in 15 minutes. Is there a way to turn off automatic inactivity shut-off? I tried everything possible, read all the related forums, instructions etc. and nothing works.

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