Checking for dead pixels means displaying full-screen solid colors, ideally using a free tool like the Lagom LCD test pages, and looking carefully across the entire panel for any pixel that stays black (dead) or stuck on a single mismatched color (stuck) regardless of what the background color is showing. This takes about five minutes and is worth doing immediately after unboxing any new monitor, while a return window is still open.
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Quick answer
Open Lagom’s dead pixel test pages in a browser, cycle through the solid red, green, blue, black, and white screens in a dimly lit room, and scan the entire panel edge to edge on each one. A dead pixel shows as a tiny black dot on any background; a stuck pixel shows as a persistent red, green, or blue dot that doesn’t match the current background color. If you find either, check your specific retailer and manufacturer’s dead pixel policy before assuming automatic eligibility for return.
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![DEAD PIXELS [Explicit]](https://m.media-amazon.com/images/I/51e0hbJYioL._SL160_.jpg)
| Type | Appearance | Fixable? |
|---|---|---|
| Dead pixel | Black dot on any background color | No, physically failed |
| Stuck pixel | Fixed red/green/blue dot regardless of background | Sometimes, with pressure or cycling techniques |
| Hot pixel | Appears brighter than surroundings even on solid colors | No |
Why checking immediately after unboxing matters
Dead and stuck pixels are a manufacturing defect present from the factory in the large majority of cases, meaning they’re either present from day one or they aren’t, rather than something that typically develops gradually during early ownership. This makes the first inspection, done properly, the most important one, since it’s the version of the panel closest to how it left the factory.
Return and exchange policies for pixel defects are also almost universally time-limited, often tied to a shorter window than a monitor’s general product warranty; a defect discovered and reported within the first days or weeks of ownership typically has a straightforward exchange path, while the same defect discovered months later may fall under a more involved standard warranty claims process instead, if it’s covered at all depending on the specific manufacturer’s terms.
Checking early also rules pixel defects out as a variable before you’ve invested time in other setup steps, like calibration covered in our monitor calibration guide, since there’s little point spending 20 minutes calibrating color accuracy on a panel you might end up returning for an unrelated defect anyway.
Setting up a proper inspection environment
A dimly lit room improves contrast between a defect and the surrounding solid color significantly, particularly for spotting a dead (black) pixel against a dark background color, which is one of the harder combinations to catch under bright ambient lighting. Turning off overhead lights and closing blinds for the few minutes this check takes makes a meaningful difference in what you’re able to see.
View the screen from a normal seated viewing distance rather than pressing your face close to the panel; while it might seem like closer inspection would catch more defects, viewing too close can actually introduce false positives from panel viewing-angle characteristics that aren’t real defects, particularly on VA and some IPS panels where color and brightness shift slightly at extreme viewing angles, covered in our IPS vs VA vs TN comparison.
Clean the screen surface with an appropriate microfiber cloth before starting, since dust particles or fingerprints on the glass or panel coating can visually resemble a stuck or dead pixel from a distance, leading to a false alarm that a simple cleaning would have resolved; never use harsh chemical cleaners, alcohol-based solutions, or paper towels, which can damage anti-glare coatings common on gaming monitors.
Running the Lagom dead pixel test
Navigate to Lagom’s LCD test website and find its dedicated dead pixel test page, which cycles through or provides links to full-screen solid color displays: pure red, green, blue, white, and black, in sequence. Display each one full-screen (most browsers support pressing F11 for full-screen mode, removing browser chrome and any other on-screen elements that could interfere with a clean view of the panel).
Work through each color methodically, scanning in a grid pattern (left to right, top to bottom) rather than glancing quickly at the whole screen at once, since a single small defect is genuinely easy to miss with a quick glance, particularly on higher resolution panels where individual pixels are physically smaller and less noticeable from normal viewing distance.
Pay particular attention to the black screen for catching stuck pixels (since any non-black dot stands out clearly against pure black) and the white screen for catching dead pixels (since any non-white dot, appearing dark, stands out clearly against pure white). The red, green, and blue screens are useful for confirming exactly which sub-pixel color, if any, is involved in a suspected stuck pixel.
If you spot something, note its approximate position on the panel (for example, “roughly 2 inches from the left edge, 1 inch from the top”) since this documentation is useful both for your own tracking if checking again later and for any return or warranty claim process that asks for defect location details.
Distinguishing dead, stuck, and hot pixels
A dead pixel has failed completely, receiving no power to any of its sub-pixel components, and appears as a small black dot regardless of what color the rest of the screen is displaying; this is the most straightforward type to identify since its appearance never changes across any of the test colors.
A stuck pixel, by contrast, is still receiving power but is stuck displaying a single color (typically appearing as a small red, green, or blue dot, since these are the individual sub-pixel colors that combine to form the full color range) regardless of what the background is currently showing. Unlike a dead pixel, a stuck pixel is sometimes recoverable, since the underlying issue is a transistor stuck in one state rather than a fully failed component.
A less commonly discussed variant, sometimes called a “hot” pixel, appears as a pixel that’s persistently brighter than its surroundings even on a uniform solid color background, without necessarily being a fixed wrong color; this is less common than dead or stuck pixels but follows the same identification approach using solid color test screens.
Distinguishing between these matters practically because a stuck pixel is worth attempting the recovery techniques below before assuming a return is necessary, while a genuinely dead pixel has no realistic fix and moving directly to checking return eligibility is the more efficient path.
Checking a used or second-hand monitor
Buying a used gaming monitor makes this same checking process worth running immediately, both for the seller’s own protection and yours, since a used monitor typically comes with a much shorter or nonexistent return window compared to a new retail purchase. Running through the full solid-color sequence before finalizing a purchase, if buying in person, or immediately upon delivery if buying remotely, is the most direct way to confirm the panel’s actual condition rather than relying on a seller’s description.
Used monitors are also more likely to show early signs of a developing pixel issue that wouldn’t necessarily be present on a brand new unit, simply due to accumulated hours of use; a used monitor with several already-present dead or stuck pixels is worth factoring into the purchase price and decision, since this is a defect that generally doesn’t improve over time and may indicate a panel closer to the point where additional pixels fail.
If buying through a marketplace with a structured return or buyer protection window, running this check within that window, rather than waiting, protects your ability to actually act on anything found; many marketplace protections are time-limited in ways similar to a standard retail return policy.
Attempting to fix a stuck pixel
The most commonly cited method for freeing a stuck pixel involves gently massaging the specific pixel location with a soft cloth-covered fingertip in a small circular motion, with the monitor powered off, for roughly 10-20 seconds, then checking whether the pixel has returned to normal behavior after powering back on. This works by physically encouraging the stuck transistor to release, though it’s not guaranteed and success rates vary.
A software-based alternative involves displaying rapidly cycling colors directly over the specific stuck pixel location, sometimes called pixel-fixing software, which attempts to “exercise” the stuck transistor back into normal function through repeated rapid switching; several free tools online offer this specific function, generally running the cycling pattern for anywhere from a few minutes up to an hour in more stubborn cases.
Applying pressure to a screen carries a genuine, if generally small, risk of causing additional damage if done too firmly or over too broad an area rather than the specific small pixel location, so use minimal pressure and stop immediately if you notice any new visual artifact appearing as a result of the attempt; if a stuck pixel doesn’t respond to either method within a reasonable attempt window, it’s reasonable to treat it the same as a dead pixel for return purposes rather than continuing to attempt fixes indefinitely.
Understanding manufacturer dead pixel policies
Dead and stuck pixel return or exchange policies vary substantially between manufacturers and even between different product lines from the same manufacturer, with some offering a strict zero-defective-pixel guarantee within a specific return window, and others using a tiered threshold system based on the total number of defects and sometimes their specific location on the panel (defects in the center of the screen are sometimes weighted differently than ones near the edges under certain policies).
Checking your specific monitor’s manufacturer support page, or the retailer you purchased from, for their stated dead pixel policy before assuming any particular threshold applies is the most reliable approach, since generic advice about “acceptable” pixel counts online often reflects outdated or manufacturer-specific policies that don’t necessarily apply to your specific purchase.
Retailer-specific return policies sometimes offer more flexible terms than the manufacturer’s own stated pixel policy, particularly within a shorter general return window (commonly 15-30 days depending on the retailer) where a straightforward return for any reason, not specifically tied to a documented pixel defect threshold, might be available regardless of how many defective pixels are actually present.
When a defect isn’t actually a pixel problem
Not everything that looks like a pixel defect during this test actually is one; a small speck that appears and disappears between test attempts, or that moves position when you gently wipe the screen, is very likely dust or debris on the surface rather than a panel defect, distinguishable by the fact that a genuine dead or stuck pixel remains in an exact, fixed position across every test regardless of cleaning.
Backlight bleed or clouding, covered in more depth in our monitor test tools guide, is a different category of defect entirely, appearing as broader areas of uneven brightness rather than a single fixed-position dot, and is evaluated and addressed differently than individual pixel defects, generally through a separate return conversation focused specifically on backlight uniformity rather than pixel count.
A single defect visible only at extreme off-angle viewing but disappearing when viewed straight-on is more likely a viewing-angle characteristic of the specific panel technology rather than a true pixel defect; confirming a suspected issue from a normal, direct viewing angle before concluding it’s a genuine dead or stuck pixel avoids a false positive here.
Troubleshooting the checking process itself
If Lagom’s test pages don’t display as pure, clean solid colors and instead show visible banding or an unexpected tint across the whole screen, this points toward a graphics driver color output setting issue rather than a monitor defect; checking that your graphics driver (NVIDIA, AMD, or Intel control panel) is outputting full RGB range at the correct bit depth for your connection is worth confirming before concluding anything about the physical panel itself.
A suspected defect that appears in the same screen position regardless of which application or content is displaying it, including the browser-based Lagom test, confirms it’s tied to the physical panel rather than a specific piece of software; if a suspected defect only appears within one specific application or game but not during the Lagom test, it’s more likely a rendering issue within that specific software rather than an actual pixel defect.
If you’re uncertain whether something you’re seeing qualifies as a genuine defect worth pursuing a return over, photographing the screen displaying the relevant solid color test page, with the camera held steady and reasonably close, can help clarify the issue when reviewing it later or when submitting documentation as part of a return or warranty claim.
Frequently asked questions
What’s the difference between a dead pixel and a stuck pixel?
A dead pixel has failed completely and stays black regardless of what color the rest of the screen is displaying, while a stuck pixel is still receiving power but stuck showing a single color, most often red, green, or blue, that doesn’t change with the background.
Can a stuck pixel be fixed without replacing the monitor?
Sometimes, since a stuck pixel (unlike a genuinely dead one) is a transistor that’s stuck in one state rather than physically failed, and gentle pressure or rapid color cycling techniques occasionally free it, though these methods aren’t guaranteed and carry a small risk if pressure is applied too firmly.
How many dead pixels are considered normal or acceptable?
This varies significantly by manufacturer and their specific stated policy, with some allowing zero defective pixels for a return while others use tiered thresholds based on pixel location and count, so checking your specific manufacturer and retailer’s policy is more useful than assuming a universal standard.
Should I check for dead pixels immediately or can it wait a few weeks?
Check immediately after unboxing, since most return and exchange windows for pixel defects are time-limited, and a defect found on day 45 may no longer qualify for the straightforward exchange process available on day 2.
Can dead pixels develop over time on a monitor that was fine initially?
Yes, though it’s uncommon, pixels can fail after months or years of use due to normal component aging, which is a separate situation from a factory defect and typically falls outside a standard dead pixel return policy but may be covered under a general product warranty depending on the manufacturer.
Nina Alvarez, Display Specialist, runs this exact checking process on every monitor before it reaches the colorimeter and pattern generator for full testbench evaluation, since it’s the fastest way to rule out a defective unit before investing time in anything else. If you’re evaluating a new monitor purchase or considering a replacement, our guides to best gaming monitors and choosing a gaming monitor cover what else to look for.
