Screen Tool Fixer: Galaxy Diagnostics

With One UI 6.1 and newer, Samsung has moved diagnostics into Settings > Device Care > Diagnostics. The old *#0*# menu is deprecated but still active for legacy support. However, the "stuck" bug persists.

Newer "Fixer" tools now utilize Samsung Knox logs to determine why the diagnostic screen hijacked the bootloader. If you have a Galaxy S23 or S24 series, use Samsung Members app > Interactive diagnostics > Reset all tests to clear the loop.

For Samsung technicians and power users, this is the true "Galaxy Diagnostics Screen Tool."

Using the Fixer specifically:

If your screen works but colors look "off," you can calibrate it without any fixer tool:

This is not a "repair," but it compensates for minor aging of the OLED panel.

Before you can fix anything, you need to open the native diagnostic screen. Do not download third-party "fixer" apps—they are usually malware. galaxy diagnostics screen tool fixer

Method 1: The Samsung Members App (Official & Safest)

Method 2: The Secret Service Code (Pro Level) Open your phone dialer and enter: *#0*# This instantly launches the hidden "LCD Test" / Service Menu. Note: This may not work on US carrier-locked models (Verizon, AT&T, T-Mobile).

For truly bricked devices stuck on a black diagnostic screen, an EDL cable tricks the phone into thinking the battery is dead, forcing a reset. With One UI 6

Let’s demystify the name. You won't find an icon labeled "Tool Fixer" on your home screen. Instead, this refers to a combination of two features:

Think of the Galaxy Diagnostics Screen Tool Fixer as the "Check Engine Light" for your phone, but with the ability to reset the error codes. It interacts directly with the display controller (the chip that tells the pixels what to do).