There should be an option in the TV setup menu somewhere for having TV speakers on or or off when headphones are connected - - at least my Sony TV has that option - - so take a look at audio setup options in the TV menu.
There should be an option in the TV setup menu somewhere for having TV speakers on or or off when headphones are connected - - at least my Sony TV has that option - - so take a look at audio setup options in the TV menu.