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If you wish to use bluetooth headphones and the internal speakers then you need to do the following.

First pair the bluetooth headset to ensure the TV has it listed in its available devices

         Press and hold cog button on remote for 5 Sec

         Select Sound

          Select Sound Out

         Scroll down to Bluetooth and select the "Device list" on the right

         If not already searching press the search button

         Switch on your bluetooth headset in pairing mode.

         Select your device when it pops up. 

Go to the Sound configuration menue

Scroll down to  "Bluetooth Surroundsound + Internal TV Speakers"

Click on the device list on the right

Select your bluetooth headset.

Exit from the screen

Job Done