You can access the Samsung diagnostic tool using secret codes in your phone app. The code you use depends on your specific carrier or region. Method 1: The Universal Dial Code Open the app. Open the Keypad . Type *#0*# . The diagnostic screen will open automatically. Method 2: The Alternative Code
Tests the hardware buttons alongside the screen's response to capacitive inputs.
If your screen is completely broken but the phone still functions internally, Samsung has a solution. Connect your Galaxy device to an external monitor using a USB-C to HDMI hub adapter. Hold down both volume buttons simultaneously while connecting the adapter to your phone. Once connected, use a wired USB mouse and keyboard to navigate the mirrored display, back up your data, and enable Maintenance Mode before sending the device for professional repair. samsung galaxy diagnostics screen tool fixer
To help me tailor any further advice for your device, could you let me know:
I can provide tailored instructions to help you fix your exact issue. Share public link You can access the Samsung diagnostic tool using
Any tiny black or white dots that shouldn't be there.
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. Open the Keypad
If your screen is completely unresponsive or black, you cannot enter dialer codes. Use these forced hardware reset techniques to jumpstart the display controller:
This tests your screen's interaction with physical buttons (Volume, Power). Pressing a physical key will change the background color of the screen, proving the hardware controller is sending the correct signal to the display driver.
Furthermore, if you are buying a used Samsung Galaxy, always run the *#0*# code before handing over any cash. It is the fastest way to ensure you aren't buying a device with hidden screen burn-in or a faulty vibration motor.