Uploaded December 2025 | Updated September 2026, 1 week ago
Is your Samsung Galaxy S21 dead, stuck in a reboot loop, or refusing to turn on? In this video, I walk you through the complete diagnostic and repair process to bring your phone back to life.
Whether you are dealing with the "black screen of death," a battery that drains instantly, or a phone that keeps restarting, a battery replacement or connection check is often the solution. I’ll show you the step-by-step disassembly, how to safely remove the old battery, and how to install a new upgraded battery to fix these power issues for good.
In this video, I cover:
Diagnosing a dead Samsung S21.
Safely removing the back glass and wireless charging coil.
Disconnecting and removing the old battery.
Installing the new battery (Upgrade).
Reassembling the phone and testing for the boot loop issue.
Is your Samsung Galaxy S21 dead, stuck in a reboot loop, or refusing to turn on? In this video, I walk you through the complete diagnostic and repair process to bring your phone back to life.
Whether you are dealing with the "black screen of death," a battery that drains instantly, or a phone that keeps restarting, a battery replacement or connection check is often the solution. I’ll show you the step-by-step disassembly, how to safely remove the old battery, and how to install a new upgraded battery to fix these power issues for good.
In this video, I cover:
Diagnosing a dead Samsung S21.
Safely removing the back glass and wireless charging coil.
Disconnecting and removing the old battery.
Installing the new battery (Upgrade).
Reassembling the phone and testing for the boot loop issue.
