LCD Dead Pixel Test
Run an LCD dead pixel test in your browser: go full screen and cycle through solid colors. On LCD panels a dead pixel shows as a dark grey dot on white — and unlike OLED, a stuck pixel on LCD has a real chance of being fixed by software.
Quick answer
To test an LCD for dead pixels, display full-screen solid colors — white reveals dead pixels as dark grey dots, black reveals stuck pixels as colored dots. Because LCD uses liquid crystals, stuck pixels often respond to 20 minutes of rapid color cycling with a pixel fixer. Truly dead pixels (dark on every color) cannot be fixed by software.
Test your LCD screen now
Clean the screen first — dust is the most common false positive on LCD. Set brightness to at least 70%, go full screen, and check every color.
Look for bright or colored dots — stuck pixels glow on a black background.
Press F11 for best results on desktop
How do dead pixels happen on LCD?
An LCD pixel is a sandwich: a backlight shines through a layer of liquid crystals, and a thin-film transistor (TFT) controls how much light each sub-pixel passes. Three parts can fail, and each produces a different defect:
| Defect | What failed | Appearance on LCD | Fixable by software? |
|---|---|---|---|
| Dead pixel | Transistor broken — pixel stays off | Dark grey dot, clearest on white | No |
| Stuck pixel | Liquid crystal frozen in one position | Red, green, or blue dot, clearest on black | Often — try 20 min of cycling |
| Hot pixel | Transistor stuck fully open | White dot on dark backgrounds | Sometimes |
| Pressure mark | Crystal layer physically disturbed | Irregular bright or dark patch | No — physical damage |
The key LCD-specific detail: a dead pixel is dark grey, not black. The backlight is always on behind the panel, so even a fully dead pixel lets a little diffused light through. If you see an absolute black dot, you are probably looking at dust or debris on the surface — wipe the screen and re-test.
Why stuck pixels on LCD are the most fixable
LCD is the one panel type where software pixel fixing has a genuinely decent success rate. A stuck pixel is usually a liquid crystal cell that has stopped responding to voltage changes — it is frozen, not broken. Rapid color cycling forces the cell through fast voltage swings, which can shake the crystals back into normal rotation.
Run the stuck pixel fix tool with the repair zone positioned over the pixel for 15–20 minutes. If there is no change, a second longer session (up to an hour) is reasonable on LCD before giving up. If the pixel is dark on every background — truly dead — skip the fixer and read the warranty guide instead.
Is your screen actually LCD?
IPS, VA, TN, QLED, and Mini-LED are all LCD variants — they differ in crystal arrangement and backlight, but all use liquid crystals and all behave the same way for dead pixel testing and fixing. OLED, AMOLED, and QD-OLED are not LCD.
LCD (this page applies)
IPS / VA / TN monitors, most laptops, QLED and Mini-LED TVs, budget phones and tablets, iPhone SE and iPhone 11 and earlier
Not LCD (see OLED guide)
OLED and QD-OLED TVs and monitors, AMOLED phones, iPhone 12 and later (non-SE), most flagship Android phones
Testing an OLED display instead? Use the OLED dead pixel test — defects look different there and the fix advice changes.
Frequently asked questions
What does a dead pixel look like on an LCD screen?+
A dark grey dot — not absolute black — because the backlight still illuminates the area. Easiest to spot on white. Stuck pixels show as red, green, or blue dots on black; hot pixels glow white on dark backgrounds.
Why do software pixel fixers work better on LCD than OLED?+
LCD stuck pixels are usually frozen liquid crystal cells, and rapid color cycling can shake them back into operation. OLED has no liquid crystals, so cycling rarely helps there. On LCD, 20 minutes with the fix tool is genuinely worth trying.
Is the pressure method safe on LCD screens?+
It was designed for LCD and is only appropriate there — light pressure through a soft cloth while colors cycle. Never use it on OLED/AMOLED or on a panel with impact damage; too much force creates permanent pressure marks.
Which of my screens are LCD?+
Most monitors (IPS, VA, TN), nearly all budget laptops, QLED and Mini-LED TVs, and older or budget phones. OLED, AMOLED, and QD-OLED screens are not LCD.
How many dead pixels are acceptable on an LCD monitor?+
ISO 13406-2 Class II tolerates up to 2 bright and 5 dark defects per million pixels, so one dead pixel often fails the warranty threshold. Retailer return windows (14–30 days) usually have no threshold — test new screens immediately.