> For the complete documentation index, see [llms.txt](https://guides-mechboards.gitbook.io/guides/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guides-mechboards.gitbook.io/guides/common-issues/r2g-black-display.md).

# R2G - Black Display

If the displays on your R2G board have suddenly gone completely black, the backlight has likely been turned off.

Please assign the **BL+** key in Vial and use it to increase the display brightness.

The image below circles the keys that can be used to control the display backlight.

<figure><img src="https://456586235-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6bjiReLol1HqmhjbjtT5%2Fuploads%2FRgN6GIY4c47uHL7SHqm5%2Fimage.png?alt=media&amp;token=1c9d07f7-cc75-4a18-9a4a-c7c50107dc4f" alt=""><figcaption></figcaption></figure>