InjuredPixels - Easily check your PC, laptop, tablet, smartphone, connected screen or TV for dead pixels, scratches...
Screen Tester - Each slide will show an image that makes any dead/stuck pixels, discoloration, scratches, and dust...
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Dead Pixel Locator - Locate dead pixels or lit pixels on your LCD monitor or plasma displays, TVs.
Monteon - Free online-service to test a computer monitor, laptop screen, TV or mobile device display
Screentest - Program for testing the quality of CRT/LCD screens. It displays various patterns and allows you to estimate the quality of your CRT/LCD monitor.