To test for dead pixels on a smartphone screen, run a full-screen primary color test (Red, Green, Blue, White, Black). If a pixel remains permanently black on all colors, it is a dead pixel; if it is stuck on one color, it is a stuck pixel that can often be revived using high-frequency color flashing.
Dead or stuck pixels ruin media viewing and degrade smartphone screen quality. Before bringing your phone to a repair shop, use our diagnostic guide and free interactive web tool to identify and attempt to fix the issue yourself.
Dead Pixels vs. Stuck Pixels: What’s the Difference?
- Stuck Pixels: Caused by a transistor malfunction that leaves one or two sub-pixels (Red, Green, or Blue) permanently turned ON. These appear as bright colored dots and can frequently be fixed.
- Dead Pixels: Occurs when the transistor fails completely, leaving the pixel permanently OFF (appearing as a black dot). These usually require physical display replacement.
Step 1: Test Your Screen for Dead Pixels
Use our free web tool to cycle through full-screen solid color tests on your phone:
👉 Launch the Tool: Free Online Dead Pixel & Screen Test Tool
Step 2: How to Fix a Stuck Pixel
- Open the Screen Test tool linked above.
- Select the Pixel Reviver Mode (rapid RGB color cycle).
- Set your phone brightness to maximum and let the high-speed color cycling run over the affected area for 15 to 30 minutes.
- Check if the sub-pixel unfreezes.
For more display hardware fixes, see our guide on Touch Screen Touch Sensitivity Fixes.
Frequently Asked Questions
Does warranty cover dead pixels on smartphones?
Most phone manufacturers (Samsung, Apple, Xiaomi) cover display replacement under warranty if there are 3 or more dead pixels present on the screen.