If the secret code does not work on your device, Samsung provides a user-friendly diagnostic suite inside their official utility application. Step-by-Step Instructions:
If your Samsung screen continues to malfunction after running the built-in digitizer tests, cycling the RGB color screens, and updating the TSP firmware via the secret codes, the problem is likely physical. Internal components like a loose display flex cable or localized micro-cracks in the OLED substrate will require professional hardware replacement at an authorized service center. samsung galaxy diagnostics screen tool fixer
Tests the OLED panel’s ability to turn off pixels completely for true blacks. If the secret code does not work on
Go to Settings > Display and turn on Touch Sensitivity . Tests the OLED panel’s ability to turn off
To help me tailor a fix, what of Galaxy phone are you using, and what specific screen issue (flickering, dead spots, color lines) are you facing? Share public link
Tap or choose specific components like Touchscreen or Display . Decoding the Screen Diagnostics Interface
Tapping the tile splits the screen into gradients of light and dark. Tapping the screen cycles through various brightness percentages.