LG -E405 Service Manual page 68

Check the pin and battery connect
Cable voltage 4.8V (for 5.0V)
Check MiniABB (U4000) SMT status
Exchange MiniABB or change
LGE Internal Use Only
START
terminals of I/O connector
Connection OK?
Yes
Is the u-USB
Yes
Is it changing properly
After turning on?
No
by X-ray.
the Main board and reset.
Charger Troubleshoot Flow
No
Change I/O connector
No
Change TA (or u-USB cable)
Yes
END
U4000
- 68 - Copyright © 2012 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
Only for training and service purposes