The primary code for testing your Samsung device's screen is ***#0*#**, which opens a hidden diagnostic menu for comprehensive hardware testing. This built-in tool allows you to check for dead pixels, touch sensitivity, color uniformity, and other potential display problems.
Entering this code is straightforward. Open the **Phone** app on your device, type ***#0*#** on the dial pad, and the diagnostic menu will appear automatically without needing to press the call button. The menu, often called "HwModuleTest," presents a grid of buttons, each dedicated to testing a specific component.
📱 How to Use the Samsung Screen Test Code
To effectively use the diagnostic menu, follow these steps for a thorough screen check:
- Prepare Your Screen: For accurate results, especially when checking for screen burn-in or color issues, turn off Auto Brightness or Adaptive Brightness and set your screen's brightness to maximum.
- Access the Menu: Open your phone's dialer, enter **
*#0*#**, and the test menu will launch. - Perform Individual Tests: Tap on the different colored buttons to perform specific tests. The table below outlines the key tests for display health.
| Test Function | What It Checks For | How to Perform |
|---|---|---|
| Red, Green, Blue | Dead pixels, screen burn-in, color uniformity | Tap each button to fill the screen with a solid color. Look for dark spots (dead pixels) or faint ghost images (burn-in). |
| Touch | Touchscreen responsiveness and dead zones | Tap the "Touch" button and drag your finger over the entire grid until all boxes turn green. |
| Sensor | Functionality of various sensors (e.g., proximity, light) that can affect display behavior | Tap "Sensor" to access sub-menus for testing individual sensors like the accelerometer and proximity sensor. |
| Mega Cam / Front Cam | Functionality of the rear and front cameras | The test allows you to take a photo to check for camera issues. Note that test photos are saved to your gallery. |
💡 Important Considerations Before You Start
- Carrier and Model Restrictions: This code works on many Samsung Galaxy models (like the S6 and newer), but some carriers, particularly Verizon and Sprint in the past, may have disabled this feature on their devices.
- Use with Caution: The diagnostic menu is safe for testing, but be cautious of other codes you might find online. Codes related to factory resets (like
*2767*3855#) can erase all your data. - Not a Fix-All Tool: While excellent for diagnosis, this menu is primarily for identifying problems. It does not repair hardware issues. If you discover a fault, you should contact Samsung Support or a qualified technician.
- Alternative Method: For newer Samsung devices, you can also run diagnostics through the Samsung Members app. Go to
Support>Phone diagnosticsto test various functions.
🔍 Identifying Common Screen Problems
Using the test colors is one of the most effective ways to identify common screen issues:
- Dead Pixels: These appear as small, permanent black dots on the screen that do not light up, even on a solid white or colored background.
- Screen Burn-in: This manifests as a faint, permanent ghost image or shadow that remains visible on the screen, especially when viewing a solid color. It is more common on OLED displays.
- Touch Dead Zones: These are areas on the screen that do not respond to your touch input. The touch test will clearly show if there are unresponsive sections.
The Samsung screen test code is a powerful tool for anyone looking to check the health of their device's display. I hope this guide helps you effectively diagnose any issues. If your screen passes all these tests but you're still experiencing problems, what specific issue are you seeing? Knowing more could help point you toward other solutions.