> 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="/files/4s2qSbK9AgyHoOJTdnUj" alt=""><figcaption></figcaption></figure>