Troubleshooting
Open the test in fullscreen and cycle solid red, green, blue, white, and black while scanning for a dot that stays in the same spot.
Pro tip
Set brightness to a normal level and scan each solid color slowly in fullscreen.
Common symptoms
- Tiny dot stays dark
- Single pixel stays colored
- Spot stays in one place
Dead pixel test phone helps you verify if a spot is stuck, dead, or simply a speck on the surface. After cleaning the screen, a pinpoint mark still appears in the same place, no matter what app you open. Open the test, go fullscreen, then cycle red, green, blue, white, black, and gray.
Many users think screenshots prove a dead pixel, but screenshots only capture what the system renders, not the physical panel. The key distinction is dead vs stuck. Dead usually stays dark, stuck often stays as a colored point. On TVs, viewing distance matters; a defect can disappear from the couch but be obvious up close during setup. On a phone, tilt the device slightly and repeat the fills to rule out glare. If you only notice the dot in one game or one website, repeat the same fills in a different tab to rule out rendering quirks.
To get a fair result from dead pixel test phone, keep it simple: - Set brightness to a normal level, then repeat at slightly lower and higher brightness to see if the dot changes. - Scan slowly from corner to corner, then repeat from a comfortable viewing distance. - If you are on a laptop, disable any auto brightness feature for the test. Then drag a window behind the spot. If it never moves, it is unlikely to be an app overlay.
A quick check is screenshots. If the dot shows up inside screenshots when viewed on another device, it is software or the image itself, not the panel. If it never appears in screenshots but shows on every solid fill, that points to the screen.
Run the full version on the main tool page for cleaner fullscreen patterns: dead pixel test tool. For related display checks, use the Display tests. Finish by repeating dead pixel test phone once more after a reboot or a different app, then decide if it is worth support or a return.