LG -E400f Service Manual page 79

Check the pin and battery connect
terminals of I/O connector
Cable voltage 4.8V (for 5.0V)
Check MiniABB (U400) SMT status
Exchange MiniABB or change
LGE Internal Use Only
START
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
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4. TROUBLE SHOOTING
Only for training and service purposes