How to Test Your Screen for Dead Pixels
Testing for dead pixels takes less than two minutes. The tool above cycles your entire screen through solid colors — any pixel that doesn't match the background immediately stands out.
Step 1 — Clean your screen. Wipe the display with a dry, lint-free cloth. Dust and fingerprints can mimic dead pixels on bright or solid-color backgrounds.
Step 2 — Launch full screen. Click the "Launch Full Screen" button to fill your entire display. This eliminates window borders and taskbars that could distract from the scan.
Step 3 — Cycle through all six colors. Press → or click the panel to advance through: Black → White → Red → Green → Blue → Gray. Spend 5–10 seconds on each, scanning corner to corner.
Step 4 — Look for pixels that don't match. Any dot that's the wrong color for its background is either a dead pixel or a stuck pixel. A black dot on white, a bright dot on black, or a fixed-color dot on a colored screen all qualify as defects.
If you find something, the sections below explain what you're looking at and what your options are.
What Does a Dead Pixel Look Like?
A dead pixel is a tiny dot that stays the same color no matter what the screen displays around it. On most displays it appears as:
- A black dot on a white or bright-colored screen — the most common type. The pixel receives no power and stays permanently dark.
- A white dot on a black screen — a pixel with all three sub-pixels stuck in the on state, emitting full brightness.
- A fixed-color dot (red, green, or blue) that never changes — one or two sub-pixels are stuck on while the others stay off.
Dead pixels are typically 1–3 pixels in diameter and are easiest to spot on high-contrast backgrounds. Running this test in a dim room improves contrast and makes both dead and stuck pixels easier to detect.
Dead Pixel vs Stuck Pixel — What's the Difference?
"Dead pixel" and "stuck pixel" are used interchangeably, but they describe different defects with different implications:
| Dead Pixel | Stuck Pixel | |
|---|---|---|
| Appearance | Always black — no light output | Always a fixed color (red, green, blue, or white) |
| Cause | Transistor failure — pixel receives no power | Sub-pixel locked in the "on" position |
| Visible on white background? | Yes — black dot | Yes — colored dot |
| Visible on black background? | No — invisible | Yes — bright colored dot |
| Fixable? | Rarely | Sometimes |
| Common on | Any LCD or OLED | Any LCD or OLED |
The key practical difference: stuck pixels may be fixable with pixel-cycling software. True dead pixels almost never recover. If you see a colored dot rather than a black one, visit the Dead Pixel Fix tool before concluding the damage is permanent.
What to Do If You Find a Dead Pixel
1. Verify it's a real defect. Clean the screen and re-run the test. Dust, fingerprints, dried liquid, and screen protector bubbles can all look like dead pixels at a glance.
2. Try a stuck pixel fix if the dot has color. Pixel-cycling software rapidly flashes the affected area through all colors to attempt to unstick the sub-pixel. Visit the Dead Pixel Fix tool before assuming permanent damage.
3. Check your warranty coverage. Most manufacturers have a dead pixel policy. Whether one pixel qualifies for replacement depends on its location and the brand's threshold. See the dead pixel warranty guide for specifics — Samsung, LG, Dell, and ASUS all use different standards.
4. Document the defect. Before a warranty claim, photograph the pixel against both white and black backgrounds. Keep your proof of purchase.
5. Weigh the location. A dead pixel in the corner is far less noticeable than one dead-center. If it's within warranty but barely visible, consider whether the effort of an RMA is worth it.
Frequently Asked Questions
What is a dead pixel?
A dead pixel is a pixel on an LCD or OLED screen that has permanently stopped working. The transistor controlling it has failed, so the pixel receives no electrical signal and stays dark regardless of what the display shows. Dead pixels are distinct from stuck pixels, which remain permanently lit in a fixed color. They can appear at the factory as manufacturing defects, or develop later from physical damage, heat, or general component wear.
What does a dead pixel look like?
A dead pixel most commonly appears as a tiny black dot — a dark spot that doesn't change no matter what color surrounds it. On a white background, it stands out clearly as a black pinhole. On a black background, a true dead pixel is completely invisible, which is why testing on both backgrounds matters. Stuck pixels, often confused with dead pixels, appear as a bright fixed dot in red, green, blue, or white — visible on dark backgrounds and often invisible on light ones.
How do I test for dead pixels?
The most reliable method is a full-screen solid color test — exactly what this tool runs. Launch full screen, then cycle through black, white, red, green, and blue backgrounds. Scan from corner to corner on each color. Any pixel that doesn't match the background color is dead or stuck. Testing in a dim room improves contrast. The full test takes under two minutes and works on any monitor, laptop, or TV with a browser.
What's the difference between a dead pixel and a stuck pixel?
A dead pixel is always black — it receives no power and never lights up. A stuck pixel is always a fixed color (red, green, blue, or white) because one or more sub-pixels are permanently in the on state. Dead pixels are invisible on dark backgrounds but obvious on light ones; stuck pixels are the opposite. The key practical difference: stuck pixels are sometimes fixable through pixel-cycling software; dead pixels almost never recover.
Can a dead pixel be fixed?
True dead pixels — the always-black type — almost never recover on their own or respond to software fixes. Some users attempt gentle pressure with a soft cloth to massage the transistor back to life, but this risks additional damage and is not recommended. Stuck pixels have better odds: pixel-cycling tools that rapidly flash the area through all colors can sometimes free the sub-pixel. If the defect is within the warranty period, manufacturer replacement is the most reliable solution.
Does a dead pixel spread?
In most cases, no. Each pixel in an LCD or OLED panel operates independently — a single dead pixel from transistor failure stays isolated and does not spread to neighbors under normal use. However, if the dead pixel resulted from physical damage such as a hard impact or localized pressure, the underlying damage may affect nearby pixels over time. If multiple dead pixels appear in a growing cluster, that suggests panel degradation rather than isolated transistor failure and likely qualifies for warranty replacement.
Is one dead pixel acceptable on a new monitor?
That depends on the manufacturer's tolerance policy. Most budget and mid-range monitors follow an acceptable defect standard that typically allows 1–5 dead pixels depending on their location on the panel. Premium and professional displays are held to stricter standards. Dell Ultrasharp and EIZO, for example, offer zero-bright-dot guarantees and will replace the monitor for any lit defect in a visible zone. Check the documentation for your specific model or read our brand-specific warranty guide.
Are dead pixels covered by warranty?
Usually yes, but the threshold varies by brand and product tier. Most manufacturers require a minimum number of dead pixels — often 3–8 for budget panels — before they approve a replacement. Center-zone pixels are held to stricter thresholds than edge pixels. Premium product lines often offer zero-defect guarantees. Warranties typically cover manufacturing defects for 1–3 years from purchase. See our full dead pixel warranty guide for per-brand details.
What causes dead pixels?
Dead pixels most commonly result from transistor failure in the thin-film transistor (TFT) layer of an LCD panel — the transistor stops conducting, cutting power to the pixel permanently. Other causes include physical damage from drops or pressure, manufacturing defects in the panel substrate, and in OLED panels, pixel burnout from prolonged display of static high-brightness content. Extreme heat and electrical surges can also damage pixel circuitry. Age is a contributing factor: panels accumulate more pixel failures over time as components wear.
Will a dead pixel get worse over time?
An isolated dead pixel from transistor failure is unlikely to spread or worsen on its own — it will remain a fixed dark dot. However, if the failure originated from physical damage or spreading electrical degradation in the panel, nearby pixels may fail over time. If your dead pixel count increases noticeably, especially in the same region, document the progression and contact your manufacturer. Escalating pixel failure may qualify for warranty replacement even if the initial count didn't meet the threshold.
Testing a Different Screen?
Testing a laptop, Kindle, camera sensor, VR headset, or gaming handheld? Our device-specific dead pixel guides cover every screen that isn't a desktop monitor or TV.