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LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
4.2 USB Trouble
START
(Measure during the state of
USB module running)
Input power(R436) is 5V?
No
Change main board
Check host USB port
or USB cable
Yes
No
Resolder or change R430
Yes
ACC_GP20_USB_CS_PD is 1.8V?
No
Resolder or change U402
Yes
< Main Board - Top side >
R436
U402
VBAT power(R430) is same to battery?
R436