If all boxes turn green, your touchscreen digitizer is functioning perfectly, and your issue is likely a software glitch.
Draws a grid of boxes across the screen that turn green when you pass your finger over them. samsung galaxy diagnostics screen tool fixer hot
Note: This code may be disabled by certain mobile carriers (like Verizon or AT&T). If nothing happens, use Method 2. Method 2: The Samsung Members App If all boxes turn green, your touchscreen digitizer
The green line issue affecting some Galaxy models can be diagnosed using the *#0*# menu. Tap the RED box—as your display turns red, observe whether the green lines remain visible. If they persist across all colors, this typically indicates a hardware fault requiring professional repair. Before seeking service, try: If all boxes turn green