Run the dead pixel test soon after delivery, while the seller’s return period is still open. A defect can be easy to miss during ordinary browsing, especially on a dark scene.
Dead vs. stuck vs. hot pixels
These three defects look similar at a glance. They behave differently, and only one type has a realistic fix.
| Type | Appearance | Fixable? | Common cause |
|---|---|---|---|
| Dead pixel | Always black on every color | No | Transistor failure at that subpixel |
| Stuck pixel | Single bright dot (red, green, or blue) | Sometimes | One subpixel stuck on |
| Hot pixel | Always white or bright on all backgrounds | Rarely | All three subpixels stuck on |
Dead pixels stay black when you cycle through red, green, blue, and white. Stuck pixels show one color no matter what fills the screen. Hot pixels glow on every background, including black.
A stuck subpixel is easy to miss on a white desktop and hard to ignore in a dark game scene, where it shows up as a tiny colored LED. On a new monitor, that's usually worth a return if the seller's pixel policy covers it.
How to run the test
Run this before you install drivers or mount the monitor. Keep the return label on until you have inspected the panel at each color.
Step 1: Dim the room. Turn off overhead lights. Close blinds. Ambient light hides faint stuck subpixels on bright panels.
Step 2: Open the test fullscreen. Load the dead pixel test and hit F11 or the fullscreen button. A browser window with toolbars around the edges creates false shadows at the edges.
Step 3: Cycle through solid colors. Each color reveals a different defect type:
- Red exposes stuck green or blue subpixels (they appear as bright dots against red)
- Green exposes stuck red or blue subpixels
- Blue exposes stuck red or green subpixels
- Black exposes dead pixels and hot pixels (dead = black dot, hot = bright dot)
- White catches dead pixels that only show on light backgrounds
Step 4: Scan at arm's length, then close up. Sit at your normal gaming distance first. Move to 12 inches and scan each quadrant slowly. Defects near the center bother you more than edge defects during daily use.
Step 5: Repeat on each input. Test HDMI and DisplayPort separately. A bad cable can look like a dead pixel. Swap cables before you file a return.
Test at native resolution with no scaling. Windows display scaling at 125% or 150% can blur the test pattern and hide single-pixel defects.
What to do when you find one
Document first. Take photos of the defect against red, green, and blue backgrounds with your phone camera. Include the monitor model label in one shot. Warranty teams reject claims without clear evidence.
Warranty policies vary by model:
| Policy question | Why it matters |
|---|---|
| How many bright or dark defects are allowed? | Tolerance is model- and region-specific |
| What is the seller’s return deadline? | It is separate from the manufacturer warranty |
| Does the manufacturer offer an exchange program? | Some product families have additional criteria |
Do not use a brand-level rule as a guarantee. Current manufacturer guidance can distinguish bright and dark subpixels, model families, and exchange programs; the seller’s return deadline is separate. Check the exact support page for the display you bought before filing a claim.
What about stuck pixel fixes?
Pressure tricks and color-flashing videos get passed around, but none is guaranteed, and pressing on the panel can damage it or affect a claim. A stuck subpixel may be temporary, so check it again over a few days. If it persists, follow the manufacturer’s guidance, document it, and handle it under the seller or manufacturer’s policy. Dead pixels caused by a failed transistor generally do not recover through software.
Your full setup check
A clean panel means nothing if the rest of your desk setup has problems. After the pixel sweep, you can run a keyboard test, mouse test, and gamepad tester while the seller’s return period is still open.
Once the panel passes, dial in your viewing distance with the FOV calculator. A 27-inch 1440p panel at 24 inches feels different from the same panel at 30 inches. Match your in-game FOV to your physical setup so crosshair placement feels consistent across titles.
Bottom line
Test every new monitor on day one. Ten minutes in a dead pixel test catches stuck subpixels and dead transistors before your return window closes. Take photos. Keep the box.
If you notice a defect after mounting the display, document it before moving or disassembling anything and follow the seller or manufacturer’s instructions.
Sources and scope
Pixel tolerances and exchange rules are model-specific. See Dell’s current display pixel guidelines as an example of why the exact model and policy matter.
Common questions
- How many dead pixels are acceptable?
- It depends on the exact model, seller, region, and policy. Some premium lines have separate exchange criteria, while other displays allow a limited number of subpixel defects. Check the policy for the exact monitor before deciding whether to accept or return it.
- Can you fix a stuck pixel?
- Sometimes, but nothing is guaranteed. A stuck subpixel may be temporary, yet pressing on the panel can damage it or affect a claim, so follow the manufacturer’s guidance first. Dead pixels (transistor failure) generally do not recover.
- Should I test before or after setup?
- Before. Run the test with the monitor still in its return window. Take photos of any defects against solid red, green, or blue backgrounds for warranty claims.
Topics: dead pixel, stuck pixel, monitor, screen test