What does the light on the Nintendo Switch dock indicate?

The Nintendo Switch console itself has no lights on it, relying on the display itself to indicate any relevant status.

However, the dock has a single LED on it. But what does it mean?

The Nintendo Switch dock light

When this LED lights up green, it means that video output is being sent via the HDMI cable to a TV. 

This LED is not related to charging, and will not go out when the console is fully charged.

And that’s it!

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