Screen testing guide
Choose a sequence for your device, or find a recommended test for the issue you see.
Find tests by symptom
Before testing
Clean the screen first. Use your normal viewing distance and comfortable brightness.
Note the display mode, scaling and brightness. Keep the same settings when checking again.
If a mark stays in one place, verify it with another pattern and photograph the screen.
These patterns are visual references. They cannot confirm whether a screen is an original part or automatically certify that it passes inspection.