LG E475F Service Manual page 63

Check the pin and battery connect
terminals of I/O connector
Cable voltage 4.8V (for 5.0V)
Check changing IC(U1) SMT status by
Exchange changing IC or change
the Main board and reset.
LGE Internal Use Only
START
Connection OK?
Yes
Is the u-USB
Yes
Is it changing properly
After turning on?
No
X-ray.
Charger Troubleshoot Flow
U1
No
Change I/O connector
No
Change TA (or u-USB cable)
Yes
END
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3. TROUBLE SHOOTING
Only for training and service purposes