Start the screen test
Choose Start Test to open the display patterns in fullscreen. Use the arrow keys to move between them and Esc to leave fullscreen.
Display Diagnostics
Screen Color & Pixel Test
Check your display for dead pixels, color uniformity, and gradient banding.
Switch patterns←→·EscExit fullscreen
How to test your screen online
Review colors and patterns
Cycle through solid colors and gradients to look for dead pixels, uneven color, or visible banding.
Inspect the display visually
Compare what you see across the screen. The patterns support visual inspection and do not automatically diagnose hardware faults.
This screen test can help you notice visible display issues, but results depend on your display and viewing conditions and cannot confirm hardware faults.