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Does TCL TV support the Auto Volume Control function?

Yes, Most of the TCL TV supports the Auto Volume Control function, so the TV will adjust the volume automatically and accordingly.
Note that the auto volume control feature won't change the volume value of the TV.
The Auto Volume Control function could be set up on the TV.
Press the settings   button on the TV remote, and then select Settings --> Display & Sound --> Audio --> Advanced Settings --> Auto Volume Control:
 
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