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4.8 USB Connection Trouble
4.8.1 Main Board
4 8 1 Main Board
EAG59068701
ENRY0012001
G1
1
2
3
4
G2
CN301
TP4
TP4
LTE_USB1_DP
LTE_USB1_DM
NP_USB1_DM
NP_USB1_DP
LGE Internal Use Only
R305
VDD_3.3
47K
B
R321
1K
C316
C317
2.2u
100n
U300
DG2722
1
6
D+
HSD1-
2
7
D-
HSD1+
3
8
GND
_OE
4
9
HSD2-
V+
5
10
HSD2+
S
EUSY0386501
- 47 -
4. TROUBLE SHOOTING
4. TROUBLE SHOOTING
TP1
R380
0
TP1
C
Q300
DTC114EM-T2L
EQBN0009301
E
FL302
2
P2
P4
1
P1
P3
R381
DNI
R382
DNI
TP2
CON_USB1_DM
CON_USB1_DP
R385
DNI
TP2
C358
R384
0
1u
Copyright © 011 LG Electronics. Inc. All right reserved.
USB1_SELECT
USB1_SENSE/
4
CON_USB1_DM
TP3
3
CON_USB1_DP
TP3
VDD_3.3
USB1_SELECT
NP_USB1_SELECT
Only for training and service purposes
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Troubleshooting
