Test dead pixels

Using Solid Color Images

Displaying solid color backgrounds on the screen easily helps detect pixel defects.

Why does this work?

On a solid color background, any defective pixels (dead or stuck) will stand out in contrast against the background.

Optimal Colors for Testing

• White (black dead pixels become noticeable on a white background).
• Black (for detecting bright stuck pixels).
• Red, Green, Blue (to check for stuck pixels of specific RGB colors).

What are dead pixels?

Dead pixel: A pixel that doesn’t light up at all and remains black.

Stuck pixel: A pixel that displays the same color (e.g., red, green, or blue) and stops responding to changes.

What to do if you find dead pixels?

Dead Pixel

A dead pixel is physically damaged and usually cannot be fixed. You should check the warranty terms — the manufacturer may offer to replace the TV if such defects are covered under the warranty agreement.

Stuck Pixel

A stuck pixel can sometimes be fixed.

An online tool that rapidly turns pixels on and off can "unfreeze" the stuck pixel.

Massaging the Stuck Pixel

• Place a soft cloth over the stuck pixel.
• Gently massage the defective spot with your finger or a stylus (don’t press too hard to avoid damaging the screen). Sometimes this helps, but be very careful, as too much pressure can damage the screen matrix.
• Compare with your manufacturer’s tolerance level.

Some manufacturers allow a small number of dead pixels as "normal." For example, TVs with a high pixel count (4K, 8K) may tolerate 1–2 dead pixels.

Notes

It is best to perform the test in a dimly lit room to eliminate glare that could hide defects.

This is applicable to all types of screens: LCD, OLED, QLED, and others.