LG MG180C Service Manual page 49

4. TROUBLE SHOOTING
Charging Procedure
• Connecting TA & Charger Detection
• Control the charging Current by ABB
• Charging Current flows into the Battery
Check Points
• Connection of TA
• Charging Current Path
• Battery
START
I/O Connector(CN400)
Is well-soldered?
Yes
Voltage at pin 4,6 of
Q300= 5.2V ?
Yes
Q300, D400, R428
Is well-soldered?
Yes
Voltage across R428
Is about 10~100mV ?
Yes
Battery ok?
Yes
Charge is operating properly
- 48 -
Trouble Shooting Setup
• Connect Battery & TA to the handset.
Trouble Shooting Procedure
• Check the charger connector.
• Check the charging current path.
• Check the battery
No
Re_solder the CN400
No
The TA is out of order
Change the TA
No
Re_solder
Q300, D400, R428
No
Replace Q300,D400
No
Change the battery