LG FM300 Service Manual page 76

16 15
L
USB MINI B FOR LTE USB0
K
CN302
6
7
1
VBUS
2
D-
3
D+
4
ID
5
J
GND
8
9
ENRY0011801
USB FILTER
I
FL301
2
USB0_DM
P2
1
USB0_DP
P1
R341 DNI
R342 DNI
H
All of components are DNI
G
USB A CON FOR LTE USB1
VDD_3.3
F
EAG59068701
ENRY0012001
G1
R321
1
2
3
4
C316 C317
G2
CN301
2.2u 100n
E
D
SIMCARD CON
C
R351 DNI
SIM_CLK
SIM_RST/
SIM_PWR
C339 C340 C341 C342
0.1u 100p 33p 33p
B
A
16 15
LGE Internal Use Only
14 13 12 11
R378
VDD_3.3
USB0_SENSE/
47K
C
B Q308
DTC114EM-T2L
EQBN0009301
E
R377 1K
USB0_DM
USB0_DP
C356 C357
2.2u 100n
VDD_3.3
LTE_UART_RX
R300
LTE_UART_CTS
DNI
4
USB0_DM_FL LTE_UART_TX
P4
3
USB0_DP_FL
P3
R301
LTE_UART_RTS
DNI
USB1_SELECT
R305
R380 0
USB1_SENSE/
47K
C
B Q300 SWITCH FOR LTE USB1
DTC114EM-T2L
EQBN0009301
E
FL302
1K
2 4
P2 P4 CON_USB1_DM
1 3 LTE_USB1_DP
P1 P3 CON_USB1_DP
LTE_USB1_DM
NP_USB1_DM
R381 DNI NP_USB1_DP
R382 DNI
Ethernet LED(Green)
ENSY0023001
S300 SCGC1B0100
R348
SIM_PWR
G5 G3 G1 COMMON
4.7K
8 TP302
R350 0
7 SIM_DATA
6
5 C349 LAN1_ACT_GPIO1
TP303
4 DNI
3 C335
DNI
2
1
R307 0 NP_USIM_DET/
G6 G4 G2 SW
R308 0
LTE_USIM_DET/
C350
DNI
VDD_3.3
14 13 12 11
10 9 8 7
MINI EXPRESS CARD SOCKET
1
LT_USIM_DET/
3
TP320
5
TP321
7
TP322
9
11
R326
VDD_2.6_LT
13
4.7K
15
17
19
IC302
21
11 1 23
VCC VL TP307
25
TP315
10 2 27
I_OVCC1 I_OVL1
29
9 3 31
I_OVCC2 I_OVL2
33
8 4 35
I_OVCC3 I_OVL3
37
7 5 39
I_OVCC4 I_OVL4
41
43
C318
C319 45
100n C320 C321 C322 C323
100n 47
TP317
DNI DNI DNI DNI
49
TP318
51
TP306
GND
USB0_DM_FL
USB0_DP_FL
LQI_LED2
C328
DNI
U300 DG2722
1 6
D+ HSD1- CON_USB1_DM
2 7
D- HSD1+ CON_USB1_DP
3 8
GND _OE
4 9
VDD_3.3
HSD2- V+
5 10
R385 DNI USB1_SELECT
HSD2+ S
EUSY0386501
C358
R384 0
1u NP_USB1_SELECT
VDD_3.75
R347
VDD_3.3
100
C338
DNI
LQI_LED0
10 9 8 7
- 76 -
6 5 4 3 2
VDD_3.75
C300 C301 C302 C303 C304 C305
22u 10u 4.7u 1u 0.1u 0.1u
CN300
53
2
4
6
TP305 R303
8
SIM_PWR
4.7K
10
SIM_DATA
12 IC301
SIM_CLK
14
SIM_RST/
16 1 11
TP304 VDD_2.6_LT VL VCC
18
20 2 10
R314 DNI
I_OVL1 I_OVCC1
22
24 3 9
I_OVL2 I_OVCC2
26
28 4 8
TP310 I_OVL3 I_OVCC3 TP312
C312 C313
30
DNI DNI
32 5 7
TP309 I_OVL4 I_OVCC4 TP313
34
36
C315 C314
38
100n 100n
40
42
44
46
TP308
48
TP314
50 R363
52 4.7K
IC303
54
1 11
ENZY0030701 VDD_2.6_LT
VL VCC
24-6407-052-001-888
2 10
I_OVL1 I_OVCC1
3 9
I_OVL2 I_OVCC2
4 8
I_OVL3 I_OVCC3
5 7
LT_USIM_DET/
I_OVL4 I_OVCC4
C351
C353 C354 C355 C352
100n
DNI DNI DNI 100n
LTE_USB1_DM
LTE_USB1_DP
LQI_LED0
LQI_LED1
C324 C325
DNI DNI
LQI LED(R,G,B)
C334 LD304 67-23-B7GBREW-B32-2T
DNI
EDLS0002201
3 3 3
R360 2 Q305 R361 2 Q306 R362 2 Q307
LQI_LED1 LQI_LED2
UMT2222A UMT2222A UMT2222A
1K 1K DNI
1 1 1
EQBN0005301 EQBN0005301 EQBN0005301
C346 C347
C348
DNI
DNI DNI DNI
6 5 4 3 2
7. CIRCUIT DIAGRAM
1
L
K
J
VDD_3.3
W_DISABLE/
I
PERST/
H
VDD_3.3
MODE1
MODE2
MODE3
LTE_USIM_DET/
G
F
E
D
C
B
A
1
Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes