Question 1

What constitutes a "defective" monitor for warranty returns?

Accepted Answer

Most manufacturers follow ISO 13406-2 Class II standards, which typically allow for 2-5 dead pixels per million pixels. However, "premium" models often have a "Zero Bright Dot" guarantee. Check your specific manufacturer's pixel policy immediately upon purchase.

Question 2

Can this tool fix dead pixels?

Accepted Answer

True dead pixels (black dots, failed transistors) cannot be fixed via software. However, "stuck" pixels (colored dots) can sometimes be unstuck by rapidly flashing colors. Our tool helps you diagnose the issue so you can decide if you need to try a stuck pixel fixer or return the panel.

Question 3

Is Backlight Bleeding normal?

Accepted Answer

Some degree of backlight bleed (light leakage at edges) is inherent to IPS technology, known as "IPS Glow". However, distinct bright clouded spots (clouding) or severe yellow leakage that is visible during normal content is considered a defect.

Question 4

How do I test for OLED Burn-in?

Accepted Answer

Use our Grey and Red screen tests. Burn-in typically appears as a darker "shadow" or "ghost" of a static image (like a news ticker, TikTok UI, or health bar) that remains visible against a solid grey background. If you see this, the organic sub-pixels have degraded unevenly. Proactive "scrubbing" with our noise patterns can help mitigate temporary retention before it becomes permanent burn-in.

Question 5

Why is my screen yellow when it should be white?

Accepted Answer

If your White Screen Test looks yellow, check if "Night Light" (Windows) or "Night Shift" (Mac) is enabled—these filters intentionally reduce blue light wavelengths to aid sleep. If filters are off, your monitor may be set to a "Warm" color temperature (e.g., 6500K or lower) or it might be an aging display where the blue sub-pixels have decayed faster than red and green.

Question 6

Why do I see banding in the Gradient Test?

Accepted Answer

Banding (visible steps in color) usually indicates an 8-bit or 6-bit + FRC panel trying to display 10-bit color, or it can be a symptom of high compression settings in your GPU driver. Ensure your display is set to "Full Output Dynamic Range" in your graphics control panel.

Question 7

Does this work on 120Hz / 144Hz / 240Hz monitors?

Accepted Answer

Yes, the tool renders at your browser's native refresh rate. For the "Response Time" and "Motion Blur" tests, a higher refresh rate monitor will result in smoother motion and clearer text during the scrolling test.

Question 8

Is it safe for my screen?

Accepted Answer

Absolutely. We display standard web colors. The "Screen Cleaning" mode even includes brightness controls to protect OLED panels from high-brightness static strain while you clean for extended periods.

Question 9

What is the "Dirty Screen Effect" (DSE)?

Accepted Answer

DSE looks like faint clouds, vertical bands, or a dirty window appearance when panning over uniform colors (like a football field or blue sky). Use our "White Screen" and "Grey Screen" tests to check for this common LED uniformity issue.

Monitor Test & Dead Pixel Tester - Professional Diagnostic Suite

Dead Pixel & Screen Tests

Monitor Calibration Tests

Advanced Display Tests

Keyboard Shortcuts