How to use the online screen test
Open each full-screen color and inspect the entire display from a normal viewing distance. Look for pixels that remain black, white or a different color, uneven brightness, color tinting and visible banding. Exit full-screen mode when the check is complete.
What the screen test checks
The tool helps identify dead pixels, stuck pixels, RGB color problems, uniformity issues and obvious display defects. Results are visual and depend on your screen, browser and viewing conditions.