In the Bose Music app, tap the headphone and speaker icon in the upper-left corner to access the My Bose screen
Tap the image of the soundbar shown in the bottom-right corner of the screen
Select Settings > Power Sync
Tap the toggle switch for Enable Power Sync and Sync TV
If you would also like another device to turn on with the soundbar, such as a cable or satellite box, tap the toggle for Sync Source then select a source.