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Color Screen Test
All 8 test colors in one place. Click a color, then switch with ← → while full screen — the fastest complete check for dead pixels, stuck pixels, tint and uniformity.
Click a color → full screen · ← → switch · Esc or tap exits
The 8-color screen check, color by color
Each color interrogates a different part of your panel. Run them in order — the whole sequence takes about a minute:
- White — dead (black) pixels, dust, smudges, uneven brightness, yellow or pink tints.
- Black — stuck (glowing) pixels, backlight bleed, IPS glow, edge light leaks.
- Red — stuck red sub-pixels; patches where the red channel is weak.
- Green — stuck green sub-pixels; a purple tint where green output dies.
- Blue — stuck blue sub-pixels; yellow-ish regions where blue is dim.
- Yellow — red+green uniformity; banding on compressed panels.
- Purple — red+blue uniformity and tint shifts at viewing angles.
- Cyan — green+blue uniformity; a quick pass/fail for calibration drift.
Looking for the dedicated tools? The white screen, black screen and purple screen pages add brightness shades and image downloads. For gradients, grayscale steps, motion and uniformity patterns, move on to the full monitor test.
Reading the results
A dot that stays black on every color is a dead pixel — permanent hardware failure. A dot that stays lit on black is a stuck pixel; it sometimes recovers after the panel warms up. Something blurry that moves when wiped is dust. Lines that run the full width or height of the screen are usually cable or driver faults — see the lines on screen diagnosis.
Keep testing
Color screen test FAQ
How do I switch full-screen colors?+
Click any color to go full screen, then press ← → (or tap the arrows) to cycle through all 8 colors without leaving full screen. Esc or a tap exits.
Which colors should I test?+
All eight take under a minute: white finds dead pixels and dust, black finds stuck pixels and bleed, red/green/blue expose single-channel faults, and yellow/cyan/purple reveal uniformity and tint problems.
What is an RGB test?+
Showing pure red, pure green and pure blue one after another exercises each sub-pixel channel separately. A dot that only looks wrong on one of the three colors is a stuck or dead sub-pixel, not dust.