First, in order to use this trick on the Switch, you’ll need to make sure that your console is fully updated. The device should notify you if a system update is available so you can go through with it. Second, your TV needs to have HDMI settings enabled — on some TVs, this means turning on the setting called “CEC.” If your TV doesn’t support this, you won’t be able to turn it on with your Switch. Once you have those squared away, you can turn this feature on using the following steps (via Nintendo):
- On the Nintendo Switch home menu, go to the gear icon to open Settings.
- Scroll down the left sidebar until you get to TV Settings, then select it.
- Scroll down to Match TV Power State and turn it on.
Once this option is enabled, whenever you turn the Switch on, your TV will turn on as well. As you may expect, this feature only works with the full Nintendo Switch console, which features a dock that can connect it to a TV using an HDMI cable. The cheaper Switch Lite variant can only be used as a handheld device, and therefore cannot be docked with a television.