When you link your TVs and Google Nest or Home speakers or displays, you can use Google Assistant to control music and video.
What you need
The following cast devices can play media on your TV using speakers or displays:
- Chromecast
- Chromecast Ultra
- TV that works with Google Cast
Link a TV or Chromecast that's set up and connected to Wi-Fi
- Make sure that your mobile device or tablet is connected to the same Wi-Fi or linked to the same account as your Chromecast, Google TV Streamer, speaker or display.
- Open the Google Home app
.
- Tap and hold your device's tile.
- Tap Add to a room.
- Under "Where is this device?" choose a room
tap Next.
.
tap Next.Set up and link a new TV
- Make sure that your mobile device or tablet is connected to the same Wi-Fi or linked to the same account as your Chromecast, Google TV Streamer, speaker or display.
- Open the Google Home app
- Tap Devices
.
- Tap the home that you want to add the device to
- Tap the device that you want to set up
- Make sure that the code shown on the TV matches the code shown on your mobile device.
- Tap Yes, I'm in to send anonymous data that helps us improve devices, or tap No thanks to opt out.
- Tap the room where you're setting your device up
- Tap the Wi-Fi network that you want to connect your device to
- Tap Next.
- Choose whether to receive emails about your device by tapping Sign up or No thanks.
- Choose which video services you want to add
- Tap Continue
.Note: If you get an "Error when linking device" error message, you must factory reset your Chromecast device.
Unlink a device
- Make sure that your mobile device or tablet is connected to the same Wi-Fi or linked to the same account as your Chromecast, Google TV Streamer, speaker or display.
- Open the Google Home app
- Tap Favourites
or Devices
.
- Tap and hold your device's tile.
- Tap Settings
Remove device.
or Devices 
Remove device.