LG L602i Service Manual page 117

4. TROUBLE SHOOTING
Check the pin and battery
Connect terminals of I/O connector
Start
Connection OK?
Yes
Is the TA voltage 5.4V?
Yes
Check the Q400,Q402
Yes
Charging OK?
NO
Change the board
- 118 -
NO
Change I/O connector
NO
Change TA cable
Yes
END