The first three buttons at the top of the menu display absolute, solid blocks of primary colors across 100% of your screen.
For more targeted troubleshooting, Samsung phones support additional secret codes that can address specific screen issues.
: A highly reputable toolkit capable of fixing system-level display glitches within a few clicks by downloading matching firmware packages directly from Samsung servers. 5. Summary Matrix: Diagnostic Codes and Tools Tool / Method Best Used For Access Route *#0*# Dialer Code Dead zones, stuck pixels, ghost touch calibration Phone Keypad Samsung Device Care Automated UI optimization, official diagnostic logs Settings > Device Care *#2663# Firmware Code TSP (Touch Screen Panel) firmware forcing updates Phone Keypad Desktop Repair Software Black screens, total unresponsiveness, boot loops PC via USB Cable
There are two primary ways to run diagnostics on a Galaxy device: Samsung Diagnostic Menu: Check Your Phone's Features! samsung galaxy diagnostics screen tool fixer
The screen will instantly launch a grey grid menu filled with hardware test buttons.
Inspecting these solid colors helps you spot dead pixels or stuck pixels. Staring at solid colors can also reveal screen burn-in. 2. RECEIVER
Users often confuse the diagnostic tool with other Samsung utilities. Here is the distinction: The first three buttons at the top of
If specific boxes refuse to turn green despite heavy pressure, you have identified a physical dead zone in the digitizer. If you are using a thick tempered glass screen protector, removing it and re-running this test will instantly tell you if the protector or the actual screen is at fault. 3. Screen Dimming and Refresh Rate Stability ( DIMMING )
Stuck pixels are often caused by a stalled sub-pixel transistor failing to cycle its voltage. Enter the *#0*# menu.
To safely close the hidden menu, simply tap the on your screen or navigation bar. If you are stuck in a specific test (like the Touch test), you must complete the test successfully, or hold down the physical power button to restart the device. Summary Checklist for Troubleshooting Component Issue Diagnostic Button Common Fix Screen Ghosting / Burn-in RED / GREEN / BLUE Run solid color for 10 minutes to reduce ghosting. Unresponsive Screen TOUCH Remove thick glass screen protectors; recalibrate. Silent / Muffled Audio SPEAKER / RECEIVER Clean speaker grilles with a brush while the tone plays. Inaccurate Map Directions SENSOR Inspecting these solid colors helps you spot dead
| Issue | Can Diagnostic Tool Fix? | Actual Solution | | :--- | :--- | :--- | | Physical crack with spider webs | | LCD/Digitizer replacement | | Single, permanent vertical line | No | FPC cable or panel replacement | | Water damaged display | No | Ultrasonic cleaning + new screen | | Flashing/flickering at low brightness | Maybe (50%) | If sensor reset fails, replace hardware | | "Unresponsive" after drop | Yes (if no crack) | Re-seat internal display cable (pro repair) |
For newer devices on strict carrier networks (like Verizon or AT&T), use the official app: Open the app. Tap Support at the bottom right. Select Phone diagnostics . Key Diagnostic Screen Tools for Display Fixes