How to Do a Dead Pixel Test?

First, make sure your screen is clean.

No dead pixel test can automatically mark the dot that is a dead pixel, so you should do the test by carefully looking at the screen.

To start the test, press the button below "Switch to Full Screen" - the color cycle will not start without fullscreen.

You can find sample dead pixel images below.

For example, in the exact center of the "green" color, a dot-shaped color in a different shade appeared.