What is the difference between a dead pixel and a stuck pixel?
A dead pixel usually stays black because it does not light up, while a stuck pixel can stay red, green, blue, or white on some backgrounds.
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Display troubleshooting tool
LCD Dead Pixel Tester
Run fullscreen solid-color tests to check for dead pixels, stuck pixels, backlight bleed, and display uniformity.
Dead pixel color test
Select a color, enter fullscreen, and inspect your display for stuck dots, dead pixels, glow, and uneven areas.
Mobile tip: Rotate your phone or tablet, increase brightness, and tap fullscreen for the clearest test. To exit, tap the floating “Exit fullscreen” button, swipe down from the top, or press your device Back button.
Current test color
White
How to test your display
- 1. Clean the screen. Dust can look like dead pixels.
- 2. Use fullscreen. Check each color at normal brightness. On mobile, tap “Exit fullscreen,” swipe down from the top, or press Back to leave.
- 3. Look closely. A dead pixel stays black; a stuck pixel may stay red, green, blue, or white.
- 4. Check uniformity. Use gray, white, and black to spot glow or uneven brightness.
Privacy note: This test runs fully in your browser. No image capture, upload, or device scan is required.
Troubleshooting guide
What this test can and cannot confirm
A fullscreen color test is a quick way to inspect a panel, but it works best when you know what you are actually looking for. This page helps you separate pixel defects from lighting, brightness, and normal panel behavior.
Use solid white, black, and gray to look for uneven brightness, glow, or clouding across the display. Those backgrounds are usually the fastest way to reveal uniformity issues, especially on larger monitors, laptops, and TVs where one corner may look visibly different from the rest of the panel.
Use red, green, and blue to check whether an individual pixel is failing to switch states correctly. A stuck pixel may show up on one color but disappear on another, while a dead pixel tends to stay dark across the set. That distinction is useful when you are deciding whether the issue is cosmetic, temporary, or something that may justify a return or warranty claim.
Room lighting and brightness matter more than many people expect. A panel can look dramatically different at high brightness in a dark room than it does in normal daylight use. That is why it helps to inspect suspicious areas twice: once in your typical working environment and once in a dimmer room where backlight inconsistencies are easier to spot.
This tool is best for visual confirmation, not automatic diagnosis. It cannot tell you whether a manufacturer will classify the issue as acceptable, nor can it identify the physical cause of a panel problem. What it can do is give you a clean, repeatable way to inspect the screen before you document the defect, contact support, or compare one panel against another.
Frequently asked questions
Can this test confirm backlight bleed?
It can help you spot obvious glow, clouding, or uneven dark areas, but final judgment still depends on screen brightness, room lighting, and panel technology.
Should I test more than one color?
Yes. White, black, red, green, blue, and gray backgrounds help reveal different pixel and uniformity problems.
Does this tool upload or scan my device?
No. The test runs in the browser and simply fills the screen with solid colors for visual inspection.
Guide collection
Related guides
Use these supporting guides to understand the tool result and next testing steps.
Related tools
Continue with another ScreenMetricLab utility.
Need more screen sizing help? Explore device viewport sizes, compare popular screens, or read our screen and viewport guides.