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How to Diagnose and Fix a Dead Phone | Step-by-Step Redmi A3 Case Study
In this video, we take you through an in-depth, step-by-step diagnosis and repair of a dead Redmi A3 smartphone. This is a comprehensive guide for technicians and enthusiasts who want to learn how to troubleshoot dead phones and identify the root cause of failure.
Here's what you'll learn in this video:
Step 1: Initial Checks
Measuring the battery's charging voltage.
Checking VPH voltage and diode values.
Step 2: Power IC Troubleshooting
Analyzing the power IC (Qualcomm 6125) and its output lines.
Identifying and resolving issues with secondary lines.
Step 3: Short Circuit Diagnosis
Locating two shorted buck lines.
Step-by-step troubleshooting of the power lines and CPU.
Step 4: CPU Removal and Reinstallation
Cutting glue around the CPU.
Removing the CPU from the motherboard.
Cleaning the motherboard and CPU.
Reballing the CPU and reinstalling it back onto the motherboard.
Step 5: Final Testing
Ensuring the short circuits are removed.
Turning the phone back on successfully.
We also teach you how to:
Read and analyze schematics in depth using tools like Borneo and Pragmafix.
Work systematically to identify and resolve issues effectively.
Whether you’re a beginner or an experienced technician, this video is packed with essential knowledge to improve your diagnostic and repair skills.
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