Open your monitor’s on-screen display (OSD) menu using the physical buttons
Find the Brightness or Picture setting
Increase the brightness level
Check your computer’s display settings and raise the brightness slider if available
Disable any power-saving or adaptive brightness mode
Switch to a brighter picture mode such as Standard or Vivid
Update your graphics driver
Use the monitor control software if your monitor supports it
Make sure the monitor is plugged into a proper power source
Replace a dim or failing backlight if the monitor remains too dark