How to use the Dead Pixel Test
Clean the screen gently, enter full screen, and inspect each solid color from a normal viewing distance. Scan in rows and then move closer only to confirm a suspected mark. Note the color on which it appears and photograph the panel without pressing it if you need a warranty record.
How to interpret your result
A mark that stays black on bright colors may be a dead pixel, while a fixed red, green, or blue point can indicate a stuck subpixel. Defects that change with angle or disappear after cleaning may be dust or surface contamination. Compare several colors before deciding that one point is defective.
Important limitations
The test cannot determine a manufacturer's warranty threshold or repair eligibility. Camera photos can introduce moire and are not proof of pixel count. Temporary image retention, panel pressure, and graphics-driver artifacts can resemble defects but require different diagnosis.
Troubleshooting checklist
Reconnect the display and test another input source if the mark flickers or moves. Do not press, massage, or heat the panel. Check the manufacturer policy, record the exact color and location, and repeat after the display reaches normal temperature.
Practical use cases
Run it when unboxing a monitor, before a return window closes, or after transporting a laptop. Repair desks can attach a consistent color checklist to a support ticket. Display enthusiasts can compare panels while keeping brightness, viewing distance, and room lighting consistent.
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Frequently asked questions
Can a dead pixel be repaired?
A truly dead pixel is usually a hardware defect; avoid pressure-based repair methods that can damage the panel.
Why does the spot appear only on one color?
A single failed subpixel can be visible only when the other color channels make the contrast apparent.