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If your television isn't displaying an image when using TV Mode, please follow the procedure below to reconnect your console.
* If no image can be seen in Handheld Mode and Tabletop Mode as well (your console screen being blank), see here.
First, remove your console, AC adapter, and HDMI cable from your Nintendo Switch dock.
* Also unplug the AC adapter from the mains socket, waiting at least 20 seconds before reconnecting it.
* Also unplug the HDMI cable from your television.
(1) Connect the AC adapter to the "AC ADAPTER" port.
(2) Connect the HDMI cable to the "HDMI OUT" port.
Nintendo Switch
Nintendo Switch - OLED Model
* TV Mode consumes a significant amount of power. You should connect your console directly to a wall socket, rather than via an extension cord or power strip.
* AC adapter and power outlet configurations may vary by country.
* Connect the cable directly to your television's HDMI port, rather than via an additional device such as an HDMI selector or similar.
* If there are multiple HDMI ports, please make sure you correctly select the one to which your Nintendo Switch is connected.
Once the HOME Menu is displayed on your console's screen...
Insert the console into your Nintendo Switch dock.
* If the dock light is flashing, it's possible that there's a problem with the dock. More details here.
Once you've carried out the above, please check that you can now see a picture on your TV screen. (In some instances, this may take some time.)
Try restarting your console to see if this resolve the issue.
If your TV has multiple HDMI ports, connect the HDMI cable to a different one and check for a picture. Additionally, if you have a different TV and/or HDMI cable, please see if using those with your console resolves the issue.
Remove your Switch from the dock and set it to Handheld Mode. From the HOME Menu, select "System Settings" → "TV Output", and try selecting a different value for "TV Resolution" such as "480p". Having made that change, insert your console back into the dock and check if a picture is now being displayed on your TV screen. If so, try higher resolutions like "720p" and "1080p.. (It's possible that the original resolution setting wasn't suitable for your television.)
Turn "Match TV Power State" off, and try the above procedure again, starting from step 4. The setting can be changed from the HOME Menu under "System Settings" → "TV Output" → "Match TV Power State".
If the issue is still not resolved, please contact your local customer service centre.