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Your deviceTCL C9K Mini LED
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What to do now

Find the ARC or eARC socket

Look at the HDMI sockets on the back of the television and find the one marked ARC or eARC.

Manufacturer UI recreationTCL C9K Mini LED · TCL Google TV
TCL C9K Mini LEDTCL Google TV · 14:32
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Back of the TV

HDMI 1
HDMI (ARC)
Optical audio
A recreated TCL Google TV screen for TCL C9K Mini LED, matched to the menu path documented by TCL UK Support. It is not a screenshot. The highlighted control is added by UKTechExpert, and a software update may move it slightly.