White Test Screen Check is a free online tool that allows you to display a white screen on any device to identify screen issues like dead pixels, brightness inconsistencies, and color inaccuracy. This white screen test also helps with cleaning screens by revealing dust and smudges. The site offers other color screens (red, green, blue, etc.) for calibration and testing.…White Test Screen Check is a free online tool that allows you to display a white screen on any device to identify screen issues like dead pixels, brightness inconsistencies, and color inaccuracy. This white screen test also helps with cleaning screens by revealing dust and smudges. The site offers other color screens (red, green, blue, etc.) for calibration and testing.WWWW…