Open the *#0*# menu and look at the RED and BLUE screens. If the line remains highly visible across all primary color screens, it indicates physical damage to the display's flexible matrix tape or an overheating display driver chip.
: This is the official, comprehensive software route. Located under the "Support" or "Device Care" menus, it offers a "Test all" function that systematically checks over 24 features including Wi-Fi, cameras, and battery status.
Tapping the tile splits the screen into gradients of light and dark. Tapping the screen cycles through various brightness percentages.
: Displays real-time data from the accelerometer, proximity sensor, and barometer.
A "Samsung Galaxy Diagnostics Screen Tool Fixer" would essentially be a user-friendly interface to reset touch drivers and manage pixel health without needing root access. For now, the combination of the *#0* code and third-party calibration apps is the closest equivalent. samsung galaxy diagnostics screen tool fixer
Long-press the icon on the screen until the Safe Mode prompt appears. Tap Safe Mode to reboot.
For many tests, you will need to interact with the screen. For example, the touchscreen test requires you to draw over the entire grid.
Scroll down and tap (or Battery and Device Care on older One UI versions). Scroll to the bottom and select Diagnostics . Tap Phone Diagnostics .
For more targeted troubleshooting, Samsung phones support additional secret codes that can address specific screen issues. Open the *#0*# menu and look at the RED and BLUE screens
, which opens a hidden menu for hardware tests. Alternatively, for a more user-friendly interface, navigate to the Samsung Members app Device Care settings to run comprehensive self-diagnostics. The Screen Saver: A Galaxy Diagnostic Story
If the dialer code does not work on your specific carrier model, Samsung provides a consumer-facing version of this tool.
Tapping these fills the entire screen with a solid, pure color.
Cameras, microphones, speakers, and vibration motors. Located under the "Support" or "Device Care" menus,
Before assuming it’s a broken digitizer, remove your screen protector. Dust or moisture trapped under the protector can mimic hardware failure. If the test still fails, a factory reset might clear a driver conflict, but it is likely a hardware issue. 2. Sensor Miscalibration
If specific boxes refuse to turn green, a hardware dead zone exists. If the lines jump erratically, you are experiencing "ghost touches."
One of the best ways to use these tools is to confirm the exact cause of a problem before attempting a fix.