A Step-By-Step Guide to Diagnose and Fix Mobile Battery Charging Issues.
Mobile devices have become an integral part of our lives, and their smooth functioning is essential for daily tasks. However, problems with battery charging can cause significant inconveniences. In this article, we will walk you through a detailed, easy-to-understand guide to diagnosing and fixing mobile battery charging issues like a pro.

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Step 1: Preliminary assessment using a power laboratory supply
Begin by connecting the mobile device to a power laboratory supply to check its consumption. An abnormal consumption, such as 111 mAh, indicates a potential problem with the device's charging mechanism. A functional device should only have a small, oscillating consumption when searching for the battery.

Step 2: Understanding the block diagram
To troubleshoot motherboard issues, you can either rely on schematic diagrams and service manuals or use your experience and make measurements on the motherboard without them. Start by briefly analyzing the block diagram, focusing on two main blocks: the PMIC (Power Management Integrated Circuit) voltage manager and the EFP-MIC (External Floating Point Module Interface Controller) charging circuit.

Step 3: The role of the EFP-MIC and the OVP circuit
The EFP-MIC is responsible for sending current to the battery and receiving current from the charging port. An OVP (Over Voltage Protection) circuit is located between the charging connector and the EFP-MIC to provide protection. The EFP-MIC also sends a current line called V-BAT_SYS directly to the PMIC, which means the EFP-MIC supplies both the battery and the PMIC.

Step 4: Interpreting the schematic diagram
Schematic diagrams may appear intimidating, but understanding them can be relatively easy. Observe the essential lines of the EFP-MIC, including humidity detection lines, bidirectional data lines for communication with the CPU, and directional data lines to activate cameras, flashes, and similar components. The OVB (Over Voltage Breakdown) is used to protect the device from overload and short circuits.

Step 5: Making measurements on the motherboard
Now, connect the charger and measure the input voltage of the FPC (Flexible Printed Circuit) connector, which connects the motherboard to the sub-motherboard. Ensure there is a charging voltage of around 4.5 volts. Next, connect the connector to the motherboard and check if a voltage arrives at the battery pin. If there is no voltage, it suggests that some circuit is failing, causing the abnormal consumption observed earlier.

Step 6: Disassembling the device
Carefully remove the motherboard from the chassis, the screw holding the motherboard, and the two coaxial cables. Remove the front camera and the main camera, along with the two protection sponges to avoid heat damage. Use a suitable support to hold the motherboard while working on it.

Step 7: Removing the shields and diagnosing the problem
Remove the necessary shields to expose the circuits involved in voltage management for the device. This will help you better understand the process and identify the faulty component causing the charging issue.

Conclusion:
Understanding the schematic diagram and making precise measurements on the motherboard are crucial to diagnosing and fixing mobile battery charging problems. By following this step-by-step guide, you can overcome the challenges in repairing mobile devices and ensure they're smooth functioning.

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