Dead pixel, backlight bleed and burn-in test
Find dead or stuck pixels, backlight bleed, burn-in and lines on a phone or laptop screen. Eight full-screen colours, free, no app to install.
✓ Pass if
- Every colour fills evenly, no odd dots
- Black screen shows no light bleeding at the edges
- Gradient is smooth, no lines
✗ Fail if
- A dead pixel (black or stuck dot) or a bright pixel
- Burn-in, blotches or a yellow tint
- Lines or broken colour bands
Next test: Screen refresh rate test (Hz) ›
Other tests
- Check device specs
- Screen refresh rate test (Hz)
- Touch screen test: dead zones and ghost touches
- Multi-touch test
- Speaker test: left, right, distortion
- Microphone test: record and play back
- Front camera, rear camera and flash test
- Laptop keyboard test
- Touchpad and mouse test
- Sensor and vibration test
- Fingerprint and Face ID test
- Battery and charging port test
- CPU test: performance and overheating
- WiFi and network speed test
- GPS and location test
- Manual used-device checklist