Screen Issues

Free Online Screen Test Tool - Instantly diagnose dead pixels, lines, color issues, and flickering. Multiple test modes, no download needed. Screen Issues runs entirely in your browser: open a fullscreen solid colour test to spot dead or stuck pixels, bright spots, backlight bleed, banding, vertical or horizontal lines and screen burn-in on LCD and OLED monitors, laptops, TVs and phones. Alongside the tests, step-by-step diagnosis guides explain what each defect looks like, what causes it, and whether it can be fixed at home or needs a warranty claim. Completely free, no signup and nothing to install.

Anyone buying or checking a new or used monitor, laptop, TV or phone, plus IT staff and repair techs testing displays.

When a monitor, laptop or phone screen shows a strange dot, line, blotch or flicker, people struggle to tell whether it is a dead pixel, backlight bleed, burn-in or a cable issue. Screen Issues gives free fullscreen test patterns plus plain-language guides to identify the defect and decide what to do next, before a return window closes.