If the RED, GREEN, or BLUE tests revealed stuck pixels or minor image retention, you can try using software to "wake" the pixels.
Open the app (downloadable from the Galaxy Store if not present). Tap Support (bottom right) > Phone diagnostics .
Samsung doesn't leave you completely in the dark when it comes to diagnostics. Several powerful tools are already embedded in your device's software. galaxy diagnostics screen tool fixer
| Error Code | Meaning | Quick Fix | | :--- | :--- | :--- | | | Touch screen not responding | Re-seat the LCD ribbon cable. | | MIPI Error | Camera sensor failure | Clear camera app data via ADB. | | TSP_FW_Update | Touch firmware mismatch | Run *#2663# to force TSP firmware update. | | Sensor Hub Crash | Gyro/Accelerometer stuck | Wipe the persist partition (requires root). |
If your screen missed boxes during the Touch Test and you use a screen protector, the solution might be a simple settings toggle. Go to > Display . Scroll down to Touch Sensitivity . If the RED, GREEN, or BLUE tests revealed
The menu should pop up automatically. (Note: This may be locked by some carriers or on newer Android versions). Test Components:
The diagnostic menu will open automatically without needing to press the call button. Samsung doesn't leave you completely in the dark
Most people try a standard power cycle, but that doesn't work because the diagnostic tool has root-level priority.
The screen will instantly transition to a white grid menu with gray buttons.
If the tests showed unnatural color shifts or flickering lines, try these adjustments:
It's unlikely. Pixel fixer apps work within normal operational parameters. However, advanced tools like the modified Galaxy Diagnostics software do write to the screen's firmware, which carries a small inherent risk.