Discover expert solutions for Itel cell phone repairs and SCE charging issues. Get your devices functioning optimally with our reliable repair service.
Problem 1: Charging Error
Symptoms:
The phone does not start charging when connected to a charger.
The charging symbol may not appear on the screen.
Solution Steps:
Check Battery Connector Voltage:
Use a multimeter to measure the voltage at the battery connector pins.
A healthy battery connector should output between 4.2V and 5V.
Check Battery Voltage:
Remove the battery and check its voltage.
A functional battery should show between 3.7V and 4.2V.
If the voltage is below 3.7V, charge or replace the battery.
Inspect Resistor Values and Voltage:
Locate the resistors in the charging circuit (e.g., R068, 10K ohm).
Measure their resistance and ensure they match the expected values.
Check the voltage across the resistors to verify proper operation.
Apply a Jumper and Add a 10K Resistor:
If the Battery Signal Interface (BSI) signal is missing or unstable, connect a 10K ohm resistor between BSI and GND to stabilize the signal.
Ensure a clean connection using solder.
Problem 2: Battery Complete Show Problem
Symptoms:
The phone indicates the battery is full (100%) even when it’s not properly charged.
Solution Steps:
Check Battery Connector Voltage:
Measure the output voltage at the battery connector using a multimeter.
Ensure it matches the expected range (4.2V when charging).
Inspect Resistor Values and Voltage:
Check the key resistors in the circuit, especially those in the voltage divider network (e.g., 10-ohm, 5.70K ohm resistors).
Replace any faulty resistors.
Verify Charging IC Operation:
Test the IC's input and output voltages.
Replace the IC if it fails to regulate the voltage correctly.
Problem 3: Charge Not Stored
Symptoms:
The phone charges but loses power quickly after disconnecting the charger.
The battery drains faster than expected.
Solution Steps:
Inspect the Battery:
Test the battery voltage under load conditions.
If the battery fails to hold a charge, replace it.
Check the Charging IC:
Measure the charging current to ensure it is sufficient for the battery (e.g., 500mA to 1A).
Replace the IC if it fails to deliver adequate current.
Test for Leaks:
Look for short circuits or faulty capacitors that may drain the battery.
Replace damaged components.
Inspect Power Path Resistors:
Measure the resistance values of current-sensing resistors (e.g., R068).
Replace resistors if they show incorrect values.
Problem 4: Fake Charging
Symptoms:
The charging icon appears, but the battery does not gain any charge.
The phone might power off shortly after unplugging the charger.
Solution Steps:
Test the Charger and Cable:
Use a known working charger and USB cable to rule out external issues.
Check Battery Voltage:
Measure the battery voltage before and after charging.
If the voltage remains unchanged, move to the next steps.
Inspect Charging Path:
Check for loose connections or broken traces on the PCB.
Apply jumpers if necessary to bypass damaged traces.
Replace the Charging IC:
If the IC fails to regulate or supply current, replace it with a new one.
Problem 5: Charging Stopped Problem
Symptoms:
Charging stops suddenly even though the phone is not fully charged.
Reconnecting the charger temporarily resumes charging.
Solution Steps:
Inspect the Charging Port:
Check for debris or corrosion in the charging port.
Clean or replace the port if necessary.
Test the Charging Circuit:
Check the resistor values and connections in the charging pathway.
Ensure the current-sensing resistor (R068) is functional.
Verify the Charging IC:
Test the IC for consistent voltage output.
Replace the IC if it exhibits intermittent behaviour.
Inspect for Overheating:
Ensure the charging IC is not overheating.
Check for proper heat dissipation and add thermal paste if required.
Problem 6: Charging Complete 100% Problem
Symptoms:
The phone indicates a full charge (100%) prematurely.
The battery does not actually charge to its full capacity.
Solution Steps:
Test the BSI Circuit:
Check the BSI pin and its associated resistors (e.g., 10K ohm, 5.70K ohm).
Replace resistors if their values are incorrect or inconsistent.
Calibrate the Battery:
Fully discharge and then recharge the battery to recalibrate the charge level indicators.
Inspect the Charging IC:
Ensure the IC transitions properly between constant current and constant voltage modes.
Replace the IC if it fails to perform this function.
Test the Battery:
Verify the actual capacity of the battery using a battery tester.
Replace the battery if it is degraded or faulty.
Problem 7: Auto Charging Problem
Symptoms:
The phone begins charging automatically without being connected to a charger.
This might occur due to internal circuit faults.
Solution Steps:
Inspect the Charging Port:
Check for short circuits or corrosion inside the charging port.
Replace the port if necessary.
Test for Internal Short Circuits:
Inspect the PCB for short circuits near the charging IC and related components.
Use a multimeter to identify shorted components and replace them.
Check the Charging IC:
A faulty IC might falsely detect a charger connection.
Replace the IC if it is malfunctioning.
Inspect Grounding Issues:
Ensure proper grounding of the PCB and all components.
Repair any broken ground connections.
General Repair Tips for All Problems:
Use Proper Tools:
Always use a multimeter, soldering iron, and magnifying glass for diagnostics and repairs.
Handle Components Carefully:
Avoid applying excessive heat or force to resistors, capacitors, and ICs during replacement.
Work in Steps:
Tackle one issue at a time and verify the results before moving to the next step.
Double-Check Connections:
Ensure all jumpers and solder points are clean and secure.
Replace with Genuine Parts:
Use high-quality replacement components to ensure long-term reliability.
Tags:
Mobile_Repair