Ключевые слова: adjust, card, circle, color, color bars, colorful, communication, disturbance, error, error sign, glitch, graphic, grid, illustration, image, internet, lines, monitor, no connection message, no signal, off air, offline, offline message, picture, receive, resolution, retro, screen, server down message, server error, set, sign, signal, symbol, test colors, test pattern, test pix, transmission, tuning, tv test pattern, vector maintenance, website error, website offline, world wide web,