4. TROUBLE SHOOTING
- 133 -
Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
START
Check the Connection
of uUSB
Main PCB & Sub FPCB Connection OK?
Yes
Connection OK?
Is the signal ok for USB+ & - ?
Yes
Yes
Change I/O connector( SUB FPCB CN903)
No
Check Connector( SUB FPCB CN904)
Change Sub FPCB
No
No
Change the Main PCB
END
4.7. USB
CN903
EAG63293501
11
10
9
5
4
3
2
1
8
7
6
VA906
DM
DP
FL901
4
3
P3
P4
CN904
ENBY0040601
GB042-30P-H10-E3000
16
15
17
14
18
13
19
12
20
11
21
10
22
9
23
8
24
7
25
6
26
5
27
4
28
3
29
2
30
1
VBATT
VMIC
SPK_OUT_N
USB_ID
MIC_P
MAIN_WHITE
+3V0_VIBR_MTK
MIC_N
VBUS_CHG_IN
SPK_OUT_P
+2V8_VRTC_MTK