The screen background will shift to a different bright color with each press, confirming the motherboard registers the physical button inputs. 4. Frequency & Dimming Tests
What (flickering, dead zones, discoloration) prompted your search?
The most essential code is , which instantly launches a comprehensive hardware diagnostic test menu.
If the test reveals unresponsive areas, try these steps:
Samsung Galaxy devices feature a hidden, built-in diagnostic menu. This tool allows users to test hardware components like the screen, sensors, and cameras. If your phone has display issues, this guide explains how to access and use the secret diagnostics screen tool to fix or identify the problem. How to Access the Secret Diagnostics Menu samsung galaxy diagnostics screen tool fixer
This is often an issue with the display refresh rate configuration. Navigate to Settings > Display > Motion Smoothness and switch the display from Adaptive (120Hz) to Standard (60Hz). If the flickering stops, the diagnostic reveals a timing bug in the phone’s adaptive refresh rate controller.
Tapping these turns the entire screen into a solid block of that specific color. Use this to check for dead pixels, backlight bleeding, or permanent screen burn-in.
For carrier-locked devices or a more modern user interface, use the official diagnostic suite.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. The screen background will shift to a different
Advanced codes like *#*#7780#*#* (factory restore) or *2767*3855# (complete wipe) will erase your data. Do not enter these unless you fully understand the consequences.
Notes:
This code may be restricted on some newer models (like the S24 Ultra) or by certain carriers. If it does not work, use the Samsung Members app method instead. Key Screen Tests: RED/GREEN/BLUE:
Launch the app and tap Support or Get Help at the bottom of the screen. Access Diagnostics: Tap on Phone diagnostics . The most essential code is , which instantly
What are you experiencing (e.g., flickering, dead spots, tint)?
When Is It a Hardware Issue? (Reading the Diagnostics Verdict)
Go to Settings > Display and toggle on Touch Sensitivity . This boosts the screen sensor's power, which is highly effective if you are using a thick tempered glass screen protector.