Monitor Test: Dead Pixels, Backlight Bleed, Burn-in & Ghosting Check
Comprehensive monitor test suite: check for dead pixels, backlight bleed, IPS glow, OLED burn-in & motion ghosting. Free diagnostics for all screens.
Click the button above to enter fullscreen mode. Press ESC or click anywhere to exit.
White Screen Test - Dirty Screen Effect (DSE) & Backlight Check
A brilliant pure white screen (#FFFFFF) designed to stress-test your display's brightness uniformity, color neutrality, and pixel health. This is the primary tool for finding "Dead" black pixels (which stand out against white) and assessing the condition of the backlight diffuser. It also doubles as a flashlight, a light table for tracing, or a soft light source for video calls.
⚪ Dead Pixels vs Stuck Pixels
Dead Pixels
Dead pixels don't light up at all - they appear as black dots. Use the black screen test to find dead pixels.
Stuck Pixels
Stuck pixels are stuck on a specific color (red, green, or blue) and appear as colored dots. The white screen test is perfect for finding stuck pixels, as they stand out clearly against the white background.
💡 When to Use White Screen Test
The white screen test is ideal for:
- • Quick stuck pixel detection
- • Checking for color defects on new displays
- • Troubleshooting color issues
- • Verifying display quality before purchase
🔗 Related Display Tests
More Screen Tests
Pixel & color tests
Comprehensive pixel testing with color cycling and solid screens.
Advanced Tests
Gaming & OLED diagnostics
Test for OLED burn-in, image retention, and monitor response time.
A brilliant pure white screen (#FFFFFF) designed to stress-test your display's brightness uniformity, color neutrality, and pixel health. This is the primary tool for finding "Dead" black pixels (which stand out against white) and assessing the condition of the backlight diffuser. It also doubles as a flashlight, a light table for tracing, or a soft light source for video calls.
How to Use Color Palette & Display Tester
Finding Dead Pixels
Launch the test (press 'W'). Any pixel that is broken usually fails to pass light, appearing as a sharp black dot. These are permanent hardware failures.
Checking Color Tint (Calibration)
Look at the screen from a distance. Does the white look "Yellowish" (warm) or "Blueish" (cool)? does it look pink or green on one side? This reveals your panel's color uniformity and white point calibration.
Removing Image Retention
If you have a faint "ghost" image from leaving a window open too long, leave this White Screen running at 100% brightness for 30-60 minutes. The constant voltage to all liquid crystals often "scrubs" away temporary retention.
Calculator Features
Flashlight / Light Box Mode
Bright clean light source for tracing drawings, checking film negatives, or lighting video calls.
Dead Pixel Hunter
The high-brightness background makes dead pixels (black dots) impossible to miss.
Color Temperature Check
Assess if your screen is noticeably warm (3000K) or cool (9000K) compared to daylight.
LCD Conditioning
High-voltage flush to unstuck liquid crystals and remove temporary image persistence.
Complete Function List
- Dead Pixel Detection:
- Backlight Uniformity:
- Color Tint Analysis:
- LCD Conditioning:
- Flashlight Function:
- Softbox Logic:
- Reading Light:
- Screen Burn Scrubber:
Common Calculations & Examples
Example 1: The "Dirty Screen Effect" (DSE) Test
Problem: Does your TV look like it has dirty streaks when watching hockey or football?
Steps:
- Open White Screen Test.
- Look for faint grey patches, vertical bands, or "smudges" that don't wipe off.
- This is DSE (Dirty Screen Effect), caused by uneven backlight layers.
Explanation: Uniform white requires perfect construction. Any physical imperfection in the diffuser layers shows up as a grey shadow.