White Screen Test 4K — 25 Minutes | Brightness & Dead Pixel Test

White Screen Test 4K for checking brightness uniformity, dead pixels, stuck pixels, and display consistency on OLED, LED, and LCD screens. This 25-minute fullscreen monitor and TV diagnostic test helps reveal hidden panel defects and brightness irregularities. Perfect for display calibration, monitor quality checks, and fast screen diagnostics in Ultra HD 4K. 🛠 Best Results: • Watch in fullscreen mode • Set video quality to 4K UHD • Turn off automatic sleep settings • Look for dark spots, uneven brightness, or pixel issues 📊 Technical Specs: Color: White Resolution: 3840x2160 UHD Duration: 25 Minutes FPS: 30 Audio: None 👉 Check the complete 11-color diagnostic playlist for full screen testing.