This report provides an informative analysis of the (often referred to as the "Repair Panel" or "Screen Tester" within Samsung service menus). This utility is a built-in firmware feature found in Samsung Galaxy devices designed to diagnose and rectify software-level anomalies affecting the display. It serves as a primary troubleshooting step for technicians and advanced users to distinguish between hardware failures (broken OLED/LCD panels) and software glitches (driver crashes, UI hang-ups).
Currently available as:
Allows you to draw over a grid to ensure every part of the digitiser is responding.