The fastest way to test your Samsung screen is through the secret phone dialer code. This method bypasses the operating system layer to test the hardware directly. Step-by-Step Access Open the native on your Samsung Galaxy. Ensure you are on the Keypad tab. Type the following code exactly: *#0*#
Look at the circle line. A black circle with a line through it marked means it is uncalibrated.
: Many other codes exist, but some can perform factory resets or cause unintended changes. Always double-check a code's function before you run it. For example, avoid codes like *2767*3855# , which is a known factory reset command.
This is the "old school" engineer's menu used to check for dead pixels, touch responsiveness, and sensor health. How to access : Open your Phone/Dialer app and type Key Screen Fixer Tools RED/GREEN/BLUE samsung galaxy diagnostics screen tool fixer
The Diagnostics Tool Fixer cannot repair physical cracks or leaking OLED layers. However, it can fix software-induced lines caused by a bad system update or GPU glitch.
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.
Pass your finger over all the squares to turn them green. This tests for dead zones where the digitizer fails to register touch. Completing the grid calibrates the touch sensor. 4. SUB KEY The fastest way to test your Samsung screen
Use these screens to spot stuck pixels or dead pixels. A dead pixel will show up as a black dot on a colored background, while a stuck pixel will remain a single color regardless of the background.
Note: Some carrier-locked devices (especially AT&T and Verizon models in the United States) block dialer codes. If your screen does not change, use Method 2. Method 2: The Samsung Members App
This turns off the pixels entirely on OLED/AMOLED displays. If you see light bleeding through or notice an uneven gray glow in a dark room, your display panel is experiencing structural degradation or screen burn-in. The Touch Test Matrix Ensure you are on the Keypad tab
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Try the Samsung Hidden Diagnostic Menu (a.k.a. the Service Mode) — it’s an unexpectedly powerful built-in toolbox for troubleshooting Galaxy devices. Access it by dialing #0 # on many Samsung phones (works on numerous Galaxy models) to open a diagnostics screen with quick tests for the display (colors, touch), sensors (proximity, accelerometer), cameras, speakers, vibration, and more. It’s great for ruling out hardware faults before trying repairs or third‑party “fixer” apps.