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Screen Display Test

Click a color below to view it full-screen. Check for uniformity and screen defects.

Click to Start Cycling Colors

How to Use This Test

Start the Color Cycle

Click or tap the test area to begin cycling through solid colors. The first click shows black, followed by white, red, green, and blue.

Inspect Each Color

For each color, carefully scan the entire screen for dark spots, bright spots, or discolored areas that don't match the surrounding display.

Check for Uniformity

Look for uneven brightness, color banding (visible stripes), or backlight bleeding around the edges, especially on dark colors.

Report Your Findings

After cycling through all five colors, select 'Screen Display Perfect' if no defects were found, or 'Dead Pixels Found' if you spotted any issues.

What Your Results Mean

✓

Screen Display Perfect

All five solid colors appeared uniform across the entire display with no dead pixels, stuck pixels, or backlight bleeding detected.

✗

Dead Pixels Found

You noticed dark spots (dead pixels), bright colored spots (stuck pixels), or significant display irregularities during the color cycle.

●

Slight Color Variation at Edges

Minor color shift at extreme viewing angles is normal for LCD displays and doesn't indicate a defect. OLED screens may show slight color shift as well.

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Backlight Bleeding Visible on Black

Light leakage around screen edges on dark backgrounds is common in LCD panels. Severe bleeding that affects content visibility may warrant a warranty claim.

Common Problems and Fixes

I found a dark spot on one color but not others

Some pixels may only be visible on specific colors. Try the Dead Pixel Test for a full-screen inspection. If the spot appears on multiple colors, it's likely a dead or stuck pixel that warrants documentation and a potential warranty claim.

The colors look washed out or inaccurate

Check your display brightness settings and disable any blue light filters or night modes. Calibrated displays should show vivid, accurate primary colors. Severe color inaccuracy may indicate a failing display panel.

I see horizontal or vertical lines

Lines that appear across all colors indicate a display cable or panel defect. Try restarting the device — if lines persist, the display ribbon cable may be loose or the panel may need replacement.

Screen flickers during the test

Screen flickering can be caused by PWM dimming (normal at low brightness), incompatible refresh rates, or a failing display driver. Try increasing brightness to see if flickering stops.

Colors look different on different parts of the screen

Uneven color distribution across a large display can indicate backlight issues or panel delamination. Compare the suspect area with known good displays to determine if it's within normal tolerance.

Frequently Asked Questions

What am I looking for when cycling through colors?

Look for any spots that remain dark, bright, or discolored compared to the surrounding area. Dark spots indicate dead pixels (permanently off), while bright colored spots indicate stuck pixels (permanently on). Also check for uneven backlighting or color banding.

How many dead pixels are acceptable on a new device?

Most manufacturers have a 'zero dead pixel' policy for new devices, though some allow 1-3 dead pixels depending on the brand and product tier. Check your manufacturer's warranty policy — many will replace screens with dead pixels within the warranty period.

Can dead pixels be fixed?

Some stuck pixels can be temporarily fixed by rapidly cycling colors or applying gentle pressure. However, truly dead pixels (black) cannot be repaired through software. The only permanent fix is screen replacement, which is typically covered under warranty if the device is new.

Why does my screen look different from the solid color test?

Your screen's appearance depends on ambient lighting, viewing angle, and display technology (LCD, OLED, AMOLED). OLED screens may show slightly different blacks than LCD screens. This is normal and doesn't indicate a defect.

Is this test the same as the Dead Pixel Test?

This test shows solid colors in a small box on the page, while the Dead Pixel Test uses a full-screen overlay for more thorough inspection. Both test for the same issues, but the Dead Pixel Test provides a more immersive inspection experience.

What should I do if I find dead pixels on a new device?

Document the dead pixels with photos, note the device's serial number, and contact the manufacturer or retailer immediately. Most warranties cover dead pixel defects on new devices. Keep the original packaging for potential returns.

Why This Test Matters

Identifying dead pixels on a new device before the return window closes

Checking display quality before purchasing a used phone or laptop

Verifying screen repair quality after a screen replacement service

Diagnosing display issues that appeared after a device drop or impact

Assessing screen condition before selling your device