Criteria 

#1. You Have Android TV

#2. it Has Build-in Bluetooth 

Go to Your TV Setting

Find Bluetooth Setting

Click on Bluetooth Setting

1st Turn on Bluetooth on your tv

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and enable Bluetooth Pairing Mode

Turn on Your Bluetooth Speaker & Enable Bluetooth Pairing Mode

Now You can see your Bluetooth speaker name on your tv

Then Click on your "BT Speaker" Name and wait in few seconds 

Now You Can Listen a Little sound on your Bluetooth Speaker & Your Tv Bluetooth is successfully connected to your BT Speaker