Dead pixel vs. stuck pixel: how to detect them and try to fix them

A red, green, blue, or white dot that persists after a reboot is either a stuck pixel (a transistor stuck open) or a dead pixel (a transistor that has failed entirely). The distinction matters: a stuck pixel can sometimes be fixed without any hardware repair; a dead pixel is permanent.

Identify which one you have first. It changes everything that follows.

Diagnose, attempt a fix, then know your rights

Quick summary

1. Tell dead from stuck — 2 min
2. Map defective pixels with the tester — 1 min
3. Try to unstick a pixel by cycling colors — 10–30 min
4. Try gentle pressure — 5 min
5. Understand the ISO standard and your warranty — 5 min
6. File a warranty return or replacement claim — varies

Step 1: tell dead from stuck (2 minutes)

Display each color as a full-screen solid background. The fastest way is to open a series of browser tabs with solid-color pages.

| What you see | Type of defect | |---|---| | Black dot on white, red, green, or blue background | Dead pixel (failed transistor) | | Colored dot (red, green, blue, or white) on black background | Stuck or hot pixel (transistor stuck open) | | Colored dot visible on some colors, absent on others | Stuck sub-pixel |

A dead pixel stays black regardless of what color is displayed. A stuck pixel holds its own color — it stands out immediately on dark backgrounds.

💡 Quick tip: on OLED panels, the opposite failure is possible: a sub-pixel can stay off on bright tones. Always test on a white background too.

Step 2: map defective pixels with the tester (1 minute)

Before contacting support, document each pixel's exact position. Our dead pixel tester cycles through black, white, red, green, and blue full-screen backgrounds — just note every anomaly you see.

Open the dead pixel tester: it runs entirely in your browser, nothing is sent to a server.

Photograph or write down the position (top-left corner, center, etc.) and total count. You'll need this for any warranty claim.

Step 3: try to unstick a pixel by cycling colors (10–30 minutes)

Rapid color cycling is the most effective method for recently stuck pixels. The idea: by forcing the transistor to open and close thousands of times per second, it sometimes "wakes up." This does not work on dead pixels.

Our tester includes an automatic cycling mode. Run it over the affected area for 10–20 minutes. Some pixels respond in under a minute; others need multiple sessions.

If the pixel hasn't moved after 30 minutes of cycling, try gentle pressure. If it flickers or changes color slightly, the cycling is working — keep going.

⚠️ Warning: cycling only works on stuck pixels. On a dead pixel (always black), nothing will happen — that's expected.

Step 4: try gentle pressure (5 minutes)

Use this carefully, especially on modern OLED panels:

1. Turn off the screen.
2. Wrap a soft microfiber cloth around the tip of a pencil eraser or your fingertip.
3. Apply gentle pressure directly on the defective pixel — not the neighboring pixels, exactly on the target.
4. While holding the pressure, turn the screen back on.
5. Slowly release after a few seconds.

This is not guaranteed to work, and pressing too hard can enlarge the affected area. Use it only on stuck pixels that cycling hasn't fixed, and only on LCD panels. Skip this step entirely for OLED.

Step 5: understand the ISO standard and your warranty (5 minutes)

ISO 9241-307 (the standard that replaced ISO 13406-2) classifies screen defects into four types:

• Type 1: always-on pixel (white or very bright)
• Type 2: always-off pixel (black)
• Type 3: stuck sub-pixel (fixed red, green, or blue)

It also defines four tolerance classes for manufacturers:

| Class | Type 1+2 per million pixels | Type 3 per million pixels | |---|---|---| | I | 0 | 0 | | II | 2 | 2 | | III | 5 | 15 | | IV | 50 | 150 |

Most consumer monitors are sold as Class II or Class III. On a Full HD screen (2.07 million pixels), Class II allows up to 4 Type 1 or 2 defective pixels, and 4 Type 3 sub-pixels.

Manufacturer policies can be stricter than the standard. Dell replaces the screen for any single dead pixel under its Premium Panel Guarantee. Apple, Lenovo, HP, and Asus have similar policies on their professional lines — check your documentation.

💡 Good to know: the ISO standard applies to standalone monitors and to laptop built-in displays alike. A support agent who refuses any return for a single dead pixel on a brand-new screen is typically citing Class II. Depending on your country's consumer protection law, you may still have additional recourse.

Step 6: file a warranty return or replacement claim

If your fix attempts failed and the screen is still within its warranty or return window:

1. Document it: sharp photos of the defective pixel on black and white backgrounds, with the exact position noted.
2. Check the manufacturer's pixel policy: search "dead pixel policy [brand name]." The official page states the minimum number of defective pixels that triggers a replacement.
3. Contact support with: the monitor's model number, purchase date, count and position of defective pixels, and the applicable ISO class.
4. Return window: if the screen is under 14–30 days old (depending on the retailer), a no-questions return is often available. That window runs from delivery, not from when you opened the box.

If your stuck pixel appeared after several months of use on a new or refurbished screen, the EU statutory guarantee covers defects for 2 years — a pixel defect appearing in the first months can qualify as a hidden fault.

Screen out of warranty?

A single dead or stuck pixel away from the center of the screen is often livable day-to-day. If your work requires accurate color (photo editing, video, graphic design), one fixed dot in the wrong place is disruptive — panel replacement or a new screen are the only durable options. Independent repair shops often offer LCD panel replacement at a fraction of the cost of new.