This yellow screen test fills your display with pure yellow, made by the red and green subpixels at full power with every blue subpixel switched off. That makes it one of the clearest ways to spot a stuck blue subpixel, a dead pixel or a color tint across the panel. The same page doubles as a yellow screen light: gold, lemon and mustard shades dim to a soft glow, and a timer fades them out on their own. It works on monitors, laptops, TVs, tablets and phones in Chrome, Edge, Safari and Firefox.
How to run the yellow screen test
- Clean the screen first, so dust is not mistaken for a pixel fault.
- Leave Pure yellow selected and full brightness on.
- Click the preview, tap it, or press F, and look over the whole screen from your normal distance. Then move closer and check it in sections.
- Note any dot that stays in the same place when you move your head.
- Switch to white and black with the dead pixel test to confirm each fault on other colors.
- Press Esc or double tap to exit.
What the yellow screen shows
| What you see | What it means |
|---|---|
| A blue or white dot | A blue subpixel stuck on |
| A black or dark dot | A dead pixel, or dust on the screen |
| A red dot | The green subpixel of that pixel is not lighting |
| A green dot | The red subpixel of that pixel is not lighting |
| Greenish or orange patches | Uneven color across the panel |
| The whole screen looks orange or greenish | A warm or cool color setting, or a missing color channel |
A stuck subpixel can sometimes be woken with the stuck pixel fixer. The guide on how to fix dead pixels covers warranty rules for pixel faults.
The yellow shades
| Shade | Hex and RGB | Best for |
|---|---|---|
| Pure yellow | #FFFF00, 255 255 0 | Pixel tests, the brightest yellow |
| Gold | #FFD700, 255 215 0 | A warm golden light |
| Lemon | #FFF44F, 255 244 79 | A bright, slightly soft yellow |
| Mustard | #FFDB58, 255 219 88 | A muted, warm yellow glow |
A yellow tint on your white screen
A yellow cast across white backgrounds is one of the most common screen complaints. Check these in order:
- Night light, Night Shift or Eye comfort settings. They warm the screen on a schedule. Turn them off and look again.
- True Tone on Apple devices adjusts white to the room light, so white looks yellow under warm lamps.
- Monitor color temperature. Presets named Warm or Reading, or a low blue light mode, make white look yellow. Pick Normal, Standard or 6500 K.
- An aging backlight. Older LCDs, especially with CCFL backlights, drift toward yellow over the years.
- A yellow edge or patch on a new screen. Some panels are uneven at the edges. Compare with a white screen and return the screen inside the shop's return window if it bothers you.
A monitor color test shows whether colors are actually wrong once the settings are back to normal.
Yellow patches on a projector
On a 3LCD projector, yellow or brownish blotches on a white or grey picture usually mean the blue LCD panel or its polarizer is wearing out after years of heat, so less blue reaches the screen. Show Pure yellow and then white: if the blotches appear on white but the yellow looks even, blue is fading in those areas. Cleaning the filter and running the projector cooler slows it down, but a worn optical block needs service. A projector test pattern helps with focus, geometry and color checks on the same projector.
Yellow light for reading and evenings
Gold and Mustard at 30 to 60% give a warm reading light with little blue, and Lemon at full brightness lifts a dull room on a grey day. For bedtime, warmer shades go further: the orange screen light has amber and candlelight tones with no blue at all.
What a yellow screen in a browser cannot do
The test finds faults you can see. It cannot read the panel's internal data or count pixels for you, and a browser cannot change your monitor's own color settings. Safari on iPhone keeps its address bar on screen, so check the area under it separately. For any other test color, use the color screen.
Yellow screen questions
What does a yellow screen test check?
It shows pixel faults that are hard to see on white. Pure yellow turns the blue subpixels off, so a stuck blue subpixel shows as a bright blue or white dot, and a dead pixel shows as a dark dot. It also shows uneven color across the panel as greenish or orange patches.
Why is my Nintendo Switch screen yellow?
If the Switch is stuck on a solid yellow screen and does not respond, hold the POWER button for at least 12 seconds to force it off, then turn it on again and install the latest system update. If the solid color keeps coming back, Nintendo advises a repair. If games still run but the picture on your TV looks yellow, check the TV's picture mode and color temperature instead.
What is the yellow screen of death?
On websites, it is the yellow error page that ASP.NET shows when a site's code fails, often titled Server Error in '/' Application. It means the website has a problem, not your computer. Reload later or tell the site's owner.
Can a yellow screen fix stuck pixels?
No. A still color only shows the fault. Stuck pixels sometimes recover with rapidly changing colors, which the stuck pixel fixer provides. Dead pixels that stay dark on every color rarely come back.
Why is my iPhone screen yellow?
Night Shift or True Tone is warming it. Open Settings > Display & Brightness, then turn off True Tone and check the Night Shift schedule. If it stays yellow, look for a Color Tint in Settings > Accessibility > Display & Text Size > Color Filters.