Samsung soundbar turns on automatically
The best way to connect your soundbar to your TV (when other devices are not part of your setup) is using an optical cable. One of the reasons why is because then you can use Auto Power Link. This feature turns your soundbar on when your TV turns on. However, it does mean that your soundbar won't turn off while the TV is still on. You can turn this feature off if you don't like it.

Samsung soundbar turns on automatically
To disable the Auto Power Link feature, find the Auto Power button on your soundbar remote and press it once. Each time the button is pressed, your soundbar will alternate between Power Link On and Power Link Off. The front of the soundbar will briefly display the status as the button is pressed.
This button may be clearly labeled on some Soundbar remotes, but may be hidden behind another function on others. See your user manual if you need more information.
Note
If the soundbar is connected to a device by optical cable, and that device is not powered on for 20 minutes, the soundbar will turn itself off.
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