Note: This code is blocked by certain network carriers (such as Verizon or AT&T) on branded devices. If nothing happens after typing the final asterisk, proceed to Method 2. Key Screen Tests in This Menu:

Press the Volume Up, Volume Down, Power, and Bixby buttons.

Note: This code may not work on all carriers (like Verizon) or some newer models. If it fails, try *#*#88#*#* as an alternative. 2. The Samsung Members App (User-Friendly) If you prefer a guided experience, the Samsung Members

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

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.

To diagnose your Samsung device, you can use the hidden hardware test menu or the official Samsung Members app. Hidden Hardware Test Menu ( *#0*# )

| Problem | Tool Fixer Action | |--------|-------------------| | | Recalibrates gamma curve from factory backup | | Screen flicker after update | Replays MIPI DCS commands to reinitialize panel timing | | Stuck/dead pixels | Cycles RGB subpixels rapidly with voltage modulation (non-invasive) | | Burn-in shadows | Runs a smart compensation pattern for 4 minutes (OLED refresh) | | Unresponsive touch in one area | Remaps touch grid and discards corrupted node data | | White screen of death (display crash) | Forces panel hard reset via PMIC display rail |

Maya had stumbled into the Samsung Galaxy Diagnostics Screen—a hidden recovery layer buried deep in the phone’s firmware. Most users never saw it. Technicians used a special USB-C dongle to trigger it. But sometimes, after a severe crash, the phone would fall into this limbo.

Using these tools provides a "Digital Paper Trail." If you are under warranty and your phone fails a test in the Samsung diagnostic screen, you have definitive proof to show a technician. It prevents "no fault found" returns where a repair center simply wipes your phone and sends it back without fixing the underlying hardware issue.

Samsung Galaxy Diagnostics Screen Tool Fixer: How to Access and Use Hidden Testing Menus

What specific is your screen showing (flickering, green lines, unresponsive touch)?

"It’s the screen," she said, her voice tight. "Parts of it just... stopped responding. I think it’s broken, but I can't afford a full replacement right now."