3. TROUBLE SHOOTING
- 120 -
Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3.7 USB TS
C9201
22p
R9721
100
47KR9200
VBUS_USB_OVP_IN
1uC9200
D9200
FL9200
42
31
IN OUT
GND1 GND2
FL9201
5
6
3 1
4
2
P2P4
P1P3
P6
P5
CN9200
11
10
9
5
4
3
2
1
8
7
6
D9201
33n
C9202
DNI
D9203
D9202
DNI
USB_D_M
USB_D_P
PM_USB_ID
0522 delete
600W for Low Voltage Surge
MAX.27V (22.5A)
clamping : 12V
0531 change
0.4pF
0522 change
0522 add
START
Check the Connection of uUSB
Main PCB Filter
Yes
Connection OK?
Is the signal ok for USB+ & - ?
Yes
Yes
Change I/O connector(CN9200)
No
Check Filter( FL9201)
Change Filter( FL9201 )
No
No
Change the Main PCB
END
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