Dead Pixel Test Pro
The Dead Pixel Test displays edge-to-edge solid color fields (Black, White, Red, Green, Blue, Cyan, Magenta, Yellow, and Grays 5% to 90%) with automated slideshow modes to expose stuck subpixels or dead pixels.
- Gently clean your monitor surface to avoid mistaking dust for a dead pixel.
- Enter fullscreen mode to cover every physical pixel of your screen.
- Cycle through the solid color patterns using your keyboard arrow keys, Space, or by clicking/tapping.
- Closely examine the display from different angles to spot non-functioning or stuck subpixels.
- Press Escape or click the exit button at any time to return.
What This Test Checks
- Completely dead pixels (non-responsive transistors that remain black on bright screens).
- Stuck subpixels (individual red, green, or blue subpixels locked permanently in an illuminated state).
- Hot pixels (pixels stuck at 100% white illumination regardless of background).
- Subpixel clusters and manufacturing defects across IPS, OLED, VA, and TN display panels.
How to Perform the Test
- Clean your monitor gently with a microfiber cloth to eliminate dust specks.
- Click "Start Fullscreen Test" to cover your entire display.
- Use the Right Arrow key, Spacebar, or click/tap to switch between solid colors (Black, White, RGB, Grays).
- Slowly scan your eyes horizontally and vertically across each solid color field.
- Press Escape or click the top-right exit button once your visual inspection is complete.
What to Look For
- A tiny black dot on a pure white, green, or red background indicates a dead pixel.
- A colored dot (bright red, green, cyan, or magenta) on a black or gray background indicates a stuck subpixel.
- A bright white pinpoint on a dark background indicates a hot pixel.
- Grouped defects: Two or more adjacent defective pixels often qualify a screen for warranty replacement under manufacturer Class I / Class II ISO 9241-307 guidelines.
Common Display Problems & Diagnostic Guidance
Dead Pixel vs Dust Particle
Dust particles sit on top of the outer glass and will cast a slight shadow or move if you view the panel from an extreme angle. A dead pixel lies behind the front polarizer and stays completely sharp and fixed.
Stuck Pixel vs Dead Pixel
Stuck pixels are powered transistors unable to close, showing a bright primary color. Dead pixels have lost power completely, remaining dark. Stuck pixels can sometimes unfreeze over time, while dead pixels rarely recover.
Manufacturer Warranty Thresholds
Most monitor brands follow ISO 9241-307 Class II standards, which allow 2 to 5 defective pixels per million pixels. If you detect defects on a newly purchased monitor, return it to the retailer immediately rather than waiting for manufacturer RMA.
OLED Subpixel Wear
On OLED panels, individual subpixels can degrade unevenly. Solid gray fields (50% gray and dark gray) are ideal for spotting early OLED burn-in or differential subpixel wear.
Frequently Asked Questions
Can a software test automatically fix dead pixels?
No web tool can physically repair a dead transistor that has lost electrical contact. However, rapid subpixel cycle tools can sometimes unstick a stuck subpixel by forcing state changes.
Why do I need to test multiple solid colors?
Every pixel consists of three subpixels: Red, Green, and Blue. A stuck green subpixel is invisible against a solid green screen, but stands out immediately against black, red, or blue. Cycling all primary and neutral shades ensures complete coverage.
Does this test work on 4K, 8K, and ultrawide monitors?
Yes. ScreenCheck utilizes native browser hardware acceleration and the Fullscreen API to fill every display resolution and aspect ratio (16:9, 16:10, 21:9, 32:9) natively.