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i have a samsung tv model # UN65FH6001F i cannont connect a sound bar because there is no option to turn on external speaker i

You don't normally need to turn on external speakers. On my Samsung the optical output is always live, so it's just a question of turning off the internal speakers.
 
If your TV has no option to turn off the internal speakers then you have a problem. I'm surprised, because that is a very expensive TV whereas mine is a much cheaper one. You might like to ask Samsung customer support.