How to Check for Dead Pixels on a Monitor (Step by Step)

You just unboxed a new monitor (or you are eyeing an old one) and you want to know whether it has any dead pixels. It is a smart thing to check early, because the easiest fix — an exchange — is only available inside the return window. The good news is that checking for dead pixels is quick, free, and needs nothing more than a few full-screen solid colors and a careful eye. The catch is that it is easy to get wrong: a speck of dust or a screen-coating mark looks exactly like a dead pixel until you clean the screen. Here is how to do it properly.

Dead, stuck, and hot pixels — know the difference

These three get confused constantly, and the difference determines whether anything can be done.

• Dead pixel: a pixel that emits no light at all. It shows as a single black dot that stays black on every color, including a pure white screen. On most panel types a dead pixel means the sub-pixel has physically failed, and it generally cannot be fixed.
• Stuck pixel: a pixel stuck on one color (usually red, green, or blue) regardless of what is on screen. It still emits light, so it is bright rather than black. Stuck pixels are sometimes fixable.
• Hot / always-on pixel: a pixel that is always fully on, appearing white or near-white on every screen. It is essentially a stuck pixel in the "all on" state.

The diagnostic pattern matters: a dot that is black on white is dead; a dot that is one bright color is stuck; a dot that is white on everything is hot. Only stuck and hot pixels have a realistic chance of being revived.

Step-by-step: how to check your monitor

1. Clean the screen first. This is the step everyone skips and it ruins more tests than any other. A speck of dust, a fingerprint, or a mark in the anti-glare coating looks identical to a dead pixel under a solid color. Wipe the panel gently with a clean microfiber cloth, ideally slightly dampened with water or screen cleaner, and let it dry. Many "dead pixels" vanish at this step.
2. Go full-screen with a pure white image. A full white field makes dead pixels (black dots) and hot pixels (brighter-than-white dots) obvious, and stuck pixels show as colored dots. Use your browser's fullscreen mode (F11) so the color fills the entire panel with no taskbar or chrome in the way.
3. Cycle through red, green, and blue. A dead pixel stays black on all three. A stuck pixel stays its color on all three (a stuck-red pixel, for example, glows red on the red slide and looks wrong on green and blue). Cycling the primaries pinpoints exactly which sub-pixel is affected.
4. Check gray too. A mid-gray slide is gentler on the eyes for a long scan and is also the best pattern for spotting burn-in, which often travels alongside pixel defects on older OLEDs.
5. Mark and photograph the location. If you find a suspect dot, note where it is (which corner, how far in) and take a close-up photo for documentation, especially if you plan to request an exchange.
6. Re-check after the panel warms up. A few stuck pixels resolve themselves after the panel has been on for 20–30 minutes, so test a warm screen rather than one that was just powered on cold.

You can run the free dead-pixel test and step through white, red, green, blue, and gray full-screen.

Tips for an accurate test

• Fullscreen, always. Browser chrome and the OS taskbar cover part of the panel and hide defects in those areas.
• Hide the cursor and dismiss any notifications so nothing static sits on screen during the scan.
• Dim the room for the darker colors (gray, and especially if you are also checking for backlight bleed on black); moderate lighting is fine for white and the primaries.
• View up close. A single dead sub-pixel is tiny — get within a few inches of the screen and scan systematically, left to right, top to bottom.
• Check right after unboxing. The store return window (often 14–30 days) is far more forgiving than the manufacturer warranty, so test early while an easy exchange is still possible.

Common false alarms

Not every oddity is a dead pixel. Before you worry, rule out:

• Dust and debris on the screen or trapped under the bezel (clean first, always).
• Marks in the anti-glare coating that catch light at certain angles.
• The normal sub-pixel structure of the panel itself — if you get very close you can see the RGB sub-pixel layout, which is not a defect.
• Compression artifacts or a bad source, not the panel — test with a known-good full-screen color, not a photo or video.

If a "pixel" disappears when you clean the screen or change your angle, it was never a pixel defect.

What to do if you find one

Here is the realistic picture.

A few dead or stuck pixels are common and often within manufacturer tolerance. The industry (loosely following standards like ISO 9241-307) sorts panels into classes that allow a certain number of defects of each type before the panel is considered faulty. The exact threshold varies by panel size, resolution, and brand, so there is no universal "X dead pixels = replacement" rule — you have to check the specific manufacturer's policy for your model. What this means in practice: a single dead pixel often does not qualify for a warranty replacement.

The return window is usually your best lever. If you just bought the monitor and it has a dead pixel that bothers you, exchanging it with the retailer within the return period is almost always easier than pursuing a warranty claim. Retailers are generally more flexible than the manufacturer's dead-pixel policy.

Manufacturer warranty has thresholds. Outside the return window, you would file a warranty claim, and whether it is accepted depends on the brand's dead-pixel policy for your panel class — clusters of dead pixels, or pixels near the center of the screen, are more likely to qualify than a single edge pixel.

Stuck pixels are sometimes fixable; dead pixels generally are not. A stuck pixel can occasionally be unstuck with a pixel-exerciser (rapidly flashing colors over the pixel) or, on LCD panels, gentle pressure — but there are no guarantees, and dead pixels are usually permanent. (Fixing stuck pixels is a whole topic of its own.)

Summary

• Clean the screen first — dust and coating marks mimic dead pixels and cause most false alarms.
• Test with full-screen white, then red, green, and blue (and gray) in fullscreen mode; dead = black on white, stuck = one color, hot = white on everything.
• Fullscreen, cursor hidden, varied brightness, scan up close, and check right after unboxing while the easy return window is open.
• Rule out dust, coating marks, and the normal sub-pixel structure before concluding it is a defect.
• A few dead pixels are often within manufacturer tolerance; the store return window is usually your best option for an exchange.
• Stuck pixels may be fixable; dead pixels generally are not.