Use APKPure App
Get LCD & AMOLED-Test old version APK for Android
Trouver les pixels morts et sous-pixels sur votre écran - LCD et AMOLED prêt
Find dead pixels and sub-pixels on your display.
To switch between colors swipe the screen or touch the screen longer to adjust the brightness.
LCD-Test Pro can try to fix the persistence of dead pixels. You'll find it in the market, too.