Usb - LG -E455 Service Manual

4.7. USB

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