Free online screen tests and troubleshooting guides. No downloads required.

Screen Issues is a free online resource for identifying, understanding, and troubleshooting display defects on monitors, laptops, phones, and tablets. The interactive Screen Test tool runs full-screen solid colors (white, black, red, green, blue, gray) in the browser — no download — so you can spot dead pixels, stuck pixels, bright spots, black spots, backlight bleed, and color uniformity issues in seconds. Alongside the tool, expert guides cover dead pixels, screen lines, flickering, pressure marks, color/tint problems, and device-specific cases (Mac, laptop, mobile). Content is available in English, German, Spanish, and Portuguese. Founded by Feng Zeng (Founder & Technical Director).