How it Works (Requires Expertise and Scheme):
- You need to find the right point on the phone’s motherboard to do direct charging. This is usually in the diagram scheme of the phone as per your model.
- Connect the Zener Diode 3.6 Volt in series between a power source (such as a charger or external power source) and the phone battery. Make sure the Zener Diode polarity is correct. The Zener Diode’s anode (positive foot) must be connected to a power source, and the cathode (negative leg) must be connected to the positive (+) terminal of the battery.
- The Zener Diode will keep the voltage coming into the battery no more than 3.6 Volts, preventing overcharging and damage to the battery.
This is an advanced method and can damage the phone if not done correctly. It should be done by an experienced technician.
4. Check and Replace the Battery
If the previous steps didn’t work, it may be the battery problem. An old or damaged battery may not be able to receive or store power properly.
How to Do:
- Get a new battery that is original or of good quality according to your phone model.
- Replace the old battery with a new one.
- Try charging your phone and see if the problem is resolved.
5. Check the Voltage of the Battery Connector with a Multimeter
Checking the voltage on the battery connector can help to know if there is a problem with the charging line.
How to Do (Need Tools):
- Use a multimeter set to DC voltage measurement mode.
- Attach the multimeter probe to the positive (+) and negative (-) terminals on the battery connector on the phone’s motherboard.
- Check that the rated voltage is in the range of 1.5 to 3.7 Volts. If the voltage is outside this range or there is none at all, there is a problem with the charging line.
6. Check the Charging Line
If there is no current on the battery connector, there may be disconnected or damaged components in the charging line.
How to Do:
- You need a schematic diagram for your phone model. This scheme shows the charging path and the position of the components.
- Use a multimeter to check the continuity of the charging line and components.
- Find the damaged component and replace it with a new one. It requires special skills and tools.
7. Check the Fuse, Coil, and Regulator
Fuses, coils, and regulators are important components in charging circuits. Damage to any of these components may cause charging problems.
How to Do:
- Use a multimeter to check the fuse. A broken fuse must be replaced.
- Check the coil and regulator to make sure everything is working properly.
- Replace the damaged components with new ones.
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8. Warm up or Replace the Charging IC
The Charging IC is the component that regulates the charging process. If the Charging IC is damaged, the phone cannot charge the battery.
How to Do (Requires Advanced Skills):
- Heating the charging IC with a heating device may temporarily fix the poor connection problem.
- Replacing the charging IC with a new one is a more permanent solution.
- This process requires high soldering skills and specialized tools. It should be done by an experienced technician.
9. Heat, Re-ball, or Replace Power IC
The Power IC regulates the power distribution in the mobile phone. Damage to the Power IC can affect various functions, including charging.
How to Do (Requires Advanced Skills):
- Heating the power IC can temporarily fix the problem of poor connection.
- Re-balling is the process of replacing the lead ball on the IC to ensure a good connection.
- Replacing the power IC with a new one is a more permanent solution.
- This process requires high soldering skills, specialized tools, and an understanding of mobile phone schemes. It should be done by an experienced technician.
Repairing the inside of a phone requires technical expertise, the right tools, and knowledge of phone diagrams. If you are in doubt or inexperienced, it is best to leave the repair to an experienced technician.
Doing repairs yourself may result in your phone’s warranty becoming invalid. Be sure to always exercise caution and follow the correct safety precautions when using electronic equipment.