Start with one channel
On red, green, and blue fields, keep your eyes on the same coordinate. Note whether the point becomes dark, blends in, or keeps a color unrelated to the field.
Observation checklist
Keep the suspected point in view while switching fields. Your checks stay in this browser tab.
Subpixel-focused visual check
Stuck Pixel Test for Red, Green, and Blue Pixel Defects
This stuck pixel test compares the same screen location across individual RGB channels, two-channel color combinations, black, and white. It helps you describe a persistent colored point without claiming an automatic diagnosis or repair.
Follow the color response
How to read the stuck pixel test
Cross-check combinations
Cyan, magenta, and yellow each drive two RGB channels. These combinations can clarify a pattern that was ambiguous on one primary color.
Verify on black and white
A subpixel that remains active may stand out on black. A point that remains fully dark across white and all primaries is more consistent with a different failure pattern.
Do not merge the terms
Stuck subpixel versus a dark pixel
In ordinary RGB display language, one visible pixel contains red, green, and blue color components. If one component does not switch as requested, the combined pixel may appear red, green, blue, cyan, magenta, or yellow depending on the field. That observation can be described as a possible stuck subpixel.
A point that stays dark across bright white and all three primary fields behaves differently and may be described as a possible dead pixel after surface contamination is ruled out. The stuck pixel test cannot tell you the transistor-level cause, and panel designs do not all expose subpixels in the same geometric arrangement.
Interpret the pattern carefully
Observations that deserve a second pass
| What you see | Useful comparison | Cautious reading |
|---|---|---|
| Fixed red point on black | Red, cyan, and white | May indicate a red subpixel remains active; a reflection should be ruled out. |
| Point disappears on one primary | All primaries plus CMY | The affected channel may be easier to isolate from the combination response. |
| Black point on every bright field | White and all RGB fields | May be more consistent with a non-responsive pixel or a surface speck than one active subpixel. |
| Colored area larger than one point | Grey fields and normal content | May relate to uniformity, pressure damage, image retention, or panel processing rather than one stuck subpixel. |