xiaomi mi note 9 fake charging solution

xiaomi mi note 9 fake charging

fake charging" issue on a Xiaomi Mi Note 9 typically means the phone shows it is charging, but the battery percentage does not increase or does so very slowly. This problem can arise due to hardware or software-related issues. Here's a step-by-step guide to troubleshoot and resolve it

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Hardware Solutions

Inspect the Charging Port Check

Clean the charging port with a soft brush or compressed air to remove dust and debris.
Check for physical damage to the charging port pins.

Check the Charger and Cable Check

Test the phone with a different charger and USB cable to rule out issues with the charging accessories.
Ensure you're using an original or high-quality charger and cable

Battery Connector Check

Open the phone and inspect the battery connector on the motherboard for loose connections or corrosion.
Clean the connector using isopropyl alcohol and a soft brush

Replace the Charging IC

 

If the issue persists, the charging IC might be faulty. Replace it with a compatible one.
Use a multimeter to check for voltage flow in the charging circuit

Check the Charging Path Check

Trace the charging line on the PCB using a schematic diagram.
Replace damaged components (diodes, capacitors, or resistors) in the charging circuit

Battery Replacement
If the battery is swollen or old, replace it with an original battery 

Software Solutions

1. Restart the Device

   • Sometimes a simple restart can resolve charging-related glitches.

2. Calibrate the Battery

   • Fully discharge the battery until the phone turns off.
   • Charge it uninterrupted to 100% and then restart the phone.

3. Update or Reinstall Firmware

   • Check if the phone's software is up-to-date.
   • Flash the firmware using a reliable tool if the issue is software-related.

4. Battery Usage Monitor

   • Use built-in settings or third-party apps to detect if an app is draining the battery excessively while charging.

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Pro Tip for Professionals

• Use Schematics: Download the Xiaomi Mi Note 9 PCB layout and schematics to identify and troubleshoot specific components of the charging circuit.
• Test Points: Check for short circuits on key test points using a multimeter

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If you're comfortable with PCB-level repair, I can assist with component-specific solutions and provide schematic details if needed. Let me know!