Free online yellow screen test tool for detecting dead pixels, checking red-green subpixel health, and testing color uniformity. Display a pure yellow screen to identify display defects on OLED, LCD, and LED screens. Works on smartphones, tablets, monitors, and TVs.
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Click to enter fullscreen mode and display a pure yellow screen for testing
A yellow screen test displays a pure yellow image across your entire screen, combining red and green subpixels to check for defects in both channels simultaneously. Since yellow requires both red and green subpixels to function correctly, this test is highly effective for detecting issues in either color channel.
This test is particularly useful for identifying color balance problems and checking how well your display renders the yellow spectrum. On OLED screens, it also helps detect burn-in patterns that may affect the red-green combination.
Click the 'Start Yellow Screen Test' button to enter fullscreen mode with a pure yellow display.
Look carefully for any pixels showing unexpected colors (red, green, blue, or black dots) against the yellow background.
Pay attention to any areas that appear more orange (too much red) or greenish (too much green). These indicate color balance issues.
If you find defects, note their location and severity. Press ESC or click to exit the test mode.
Appear as dark spots or dots that don't produce yellow light. Indicates dead red or green subpixels.
Uneven yellow color across the display. May show as orange patches or greenish bands indicating channel imbalance.
Pixels showing unexpected colors like pure red, pure green, blue, or black. Reveals which subpixels are malfunctioning.
Ghost images or faded areas visible on the yellow screen. Indicates burn-in affecting red or green subpixel channels.
A yellow screen test is unique because it simultaneously tests both red and green subpixels. Since yellow is produced by combining red and green light, any defect in either channel becomes immediately visible. This makes it an efficient way to check two subpixel types at once.
If your yellow screen appears orange, it means the red channel is overpowering the green. If it appears greenish, the green channel is too strong. This indicates a color balance issue that may be fixable through display calibration settings. Check your display's color temperature and RGB balance settings.
Yes, a yellow screen test can help detect OLED burn-in that affects the red-green channel combination. Burn-in patterns will appear as faded areas or ghost images on the yellow background. For comprehensive burn-in detection, combine this test with individual red and green screen tests.
While red and green screen tests individually check their respective subpixel channels, a yellow screen test checks both simultaneously. This can reveal color balance issues that individual tests might miss. However, for pinpointing which specific subpixel is defective, the individual red or green screen tests are more precise.
Ready to test your display's red-green subpixels? Start the yellow screen test now.