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3. TROUBLE SHOOTING
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Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3.7 USB TS
START
Check the Connection of uUSB
Main PCB Filter
Yes
Connection OK?
Is the signal ok for USB+ & - ?
Yes
Yes
Change I/O connector( SUB FPCB CN4)
No
Check Filter( FL9200)
Change Filter( FL9201 )
No
No
Change the Main PCB
C9201
120p
ZD9722
2
1
C9200
1u
D9200
R9200
47
K
FL9201
5
6
3
1
4
2
P2
P4
P1
P3
P6
P5
C9202
33n
D9203
2
1
D9202
2
1
FL9200
4
2
3
1
IN
OUT
GND1 GND2
VBUS_USB_OVP_IN
CN9200
EAG63510401
04-5151-005-104-883
11
10
9
5
4
3
2
1
8
7
6
USB_D_M
USB_D_P
PM_USB_ID