: Use these to test the screen's ability to handle deep blacks and various brightness levels.
For a more user-friendly, guided experience, use the Samsung Members App . How to use Samsung Members Diagnostics samsung galaxy diagnostics screen tool fixer hot
If *#0*# doesn't work, ensure Auto Blocker is disabled in your Security & Privacy settings. Official Diagnostic via Samsung Members : Use these to test the screen's ability
: Tap Red , Green , or Blue to fill the screen with that color. This helps you spot dead pixels or backlight bleeding. your touch sensor is working correctly.
: Tap Touch and trace your finger along the grid lines. If they turn green, your touch sensor is working correctly.