The Ultimate Guide to the Samsung Galaxy Diagnostics Screen Tool Fixer: Repair Hidden Touch & Display Issues

By: Tech Repair Desk
Last Updated: October 2025

We’ve all been there. One minute, your Samsung Galaxy S24, Z Fold 5, or A-series phone is working flawlessly. The next, a section of the screen stops responding to touch, colors seem washed out, or an annoying green line appears out of nowhere. Before you rush to a repair shop or spend hundreds on a screen replacement, there is a powerful, built-in secret weapon hidden inside your device: The Samsung Galaxy Diagnostics Screen Tool Fixer.

This article is your complete walkthrough. We will cover what this tool is, how to access the secret diagnostic menu, how to use its screen-fixing features, and when this tool can actually save your phone versus when you need professional help.

The Fix

The screen went white. For five agonizing seconds, Maya thought she’d killed it for good. Then, the Samsung logo appeared—glorious, blue, alive.

The phone booted normally. Her wallpaper—a photo of her dog, Pixel—greeted her. All data intact. Even the battery percentage was accurate (37%).

She quickly opened her boarding pass. It loaded.

Maya exhaled. Then she noticed a new app on her home screen: ServiceTools with a gear icon. Inside, a log entry read:

Diagnostics Tool Fixer applied: SOC voltage rail imbalance corrected. Kernel panic mitigated. Device stable.

She had accidentally used a secret recovery tool that Samsung engineers never intended for public hands.

Using the "Fixer" Functions: Step-by-Step Repairs

Once inside the tool (using *#0*#), you can actively fix many screen and touch issues. Here is how to use it as a repair tool, not just a tester.

Method 1: The Samsung Members App (Easiest for most users)

  1. Open the Samsung Members app (pre-installed on all Galaxy devices).
  2. Tap the Support tab (bottom menu).
  3. Tap Phone diagnostics (or "Interactive checks").
  4. Select Screen test or Touch test.
  5. Follow the on-screen instructions. The tool will ask you to tap specific zones, draw lines, and check for color reproduction.

Fix 4: Proximity Sensor Reset (Fixes black screens during calls)

If your screen goes black during a call and won't wake up:

  1. Go to *#0*# > Sensor.
  2. Look for Proximity Sensor Test.
  3. Wave your hand 2 inches above the top bezel. The screen should toggle between "0" (covered) and "1" (uncovered).
  4. If it stays on "0", cover the sensor completely, then uncover it rapidly 10 times. This often unsticks a mechanical sensor.
  5. Exit and reboot.