Android Pixel Diagnostic
Android Dead Pixel Test
Find missing, black, or inactive subpixels on Android smartphone and tablet displays with fullscreen color cycling.
Diagnostic Sequence Preview
This test automatically cycles through calibrated solid color surfaces.
Pure WhiteStep 1
Light Gray (82%)Step 2
Neutral Gray (50%)Step 3
Pure RedStep 4
Pure GreenStep 5
Pure BlueStep 6
Pure YellowStep 7
Pure CyanStep 8
Pure MagentaStep 9
Pure BlackStep 10
What to Look For
Inspect your Android device for missing subpixels. This test projects pure uncompressed color fields to immediately expose dead black dots or stuck subpixels.
- Small black specks on white and bright solid backgrounds.
- Dead subpixels around the punch-hole selfie camera cutout.
- Stuck bright green or red subpixels on dark gray backgrounds.
- Uniformity along the curved glass borders on curved-edge displays.
Display Preparation Tips
- 1Turn off adaptive brightness and set display brightness to 100%.
- 2Disable Eye Comfort / Reading Mode.
- 3Tap the Fullscreen button to hide the bottom gesture pill and top camera bar.
- 4Swipe left/right to step through all 10 diagnostic colors.
Frequently Asked Questions
What is the warranty policy for dead pixels on Samsung and Pixel phones?
Most Android manufacturers will replace the display under warranty if 2 or more defective pixels are found within the standard warranty period.
Can high refresh rates (120Hz) mask dead pixels?
No. A dead pixel is a physical hardware fault that remains defective regardless of refresh rate.
Ready to Check Your Screen?
Launch full-screen diagnostics right now to verify pixel health, backlight uniformity, and color fidelity across your entire display.
Start Free Screen Test