LG -V909DW Service Manual page 81

LGE Internal Use Only
TP2
TP2
FIG 27 Schematic of the FEM
FIG 27 Schematic of the FEM
Band 1 : 2100
TRX_W2100
L100
Band 1 : 2100
DNI
TRX_W2100
L100
DNI
Band8 : 900
C116
TRX_W900
Band8 : 900 C118
DNI
C116 1n
TRX_W900
Band 4 : AWS
C118
FIG 28 Schematic of the WCDMA I, VIII Rx Path
DNI
FIG 28 Schematic of the WCDMA I, VIII Rx Path
TRX_AWS
Band 4 : AWS
L115
DNI
TRX_AWS
L115 L116
DNI DNI
FIG 29 Schematic of the WCDMA IV Rx Path
FIG 29 Schematic of the WCDMA IV Rx Path
FL100
6 3
ANT TX_IN
1
RX_OUT1
L101 8
RX_OUT2
DNI 2
GND1
4 7
GND2 GND4
5 9
GND3 GND5
1950 MHz,2140 MHz
C104 10p C105
TP1
FL100
TP1
6 3
L102 L103
ANT TX_IN
10n 4.7n
1
RX_OUT1
L101 8
C109 10p C110
RX_OUT2
TP1
DNI 2
GND1
4 7
GND2 GND4
5 9
GND3 GND5
1950 MHz,2140 MHz
C104 10p C105 4p
L102 L103
10n 4.7n
C115 33p
C109 10p C110
TP2
TP2
L106
L107
5.1n
DNI
TP2
FL603
1
RX1
1n
6 8
C117 33p
ANT RX2
3
TX
C119 C115 33p
2
DNI GND1
4 7
GND2 GND4
5 9
GND3 GND6
897.5 MHz,942.5 MHz
L106
L107
5.1n
DNI
FL603
1
RX1
6 8 C117 33p
ANT RX2
3
TX
C119
2
DNI GND1
4 7
GND2 GND4
5 9
GND3 GND6
897.5 MHz,942.5 MHz L112 L113
DNI 1.5n
FL102
1
RX1
6 8
ANT RX2
3
TX
2
L116
GND1
4 7
DNI
GND2 GND4
5 9
GND3 GND6
TP3
TP3
L112 L113
DNI 1.5n
TP3
FL102
1
RX1
6 8
1732.5 MHz,2132.5 MHz
ANT RX2
3
TX
2
GND1
4 7
GND2 GND4
5 9
GND3 GND6
1732.5 MHz,2132.5 MHz
- 81 - Copyright © 2011 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
1.5n
C101
C102
0.5p
4p
PRX_W2100_M
1.5n
C101
C103
C102
4p
0.5p
PRX_W2100_P
PRX_W2100_M
PRX_W900_P
4p
PRX_W2100_P
PRX_W900_M
w900_dpx_tx_in
C121 100p
PRX_W900_P
L110
33n
PRX_W900_M
w900_dpx_tx_in
C121 100p
PRX_AWS_M
L110
33n
PRX_AWS_P
C130 1.8n
aws_dpx_tx_in
PRX_AWS_M 1p
L120
PRX_AWS_P
C130 1.8n
aws_dpx_tx_in
1p
L120
Only for training and service purposes
C103
DNI
C106
330p
DNI
14
13
12
11
10
9
8
C154
C106
330p 2.2u
14
RFOUT_LOW
13
GND3
12
VCC2
11
GND2
10
RFOUT_HI
9
GND1
8
CPL
C123
DNI
C123
DNI
C125
330p
L121
DNI
C125
330p
AWS_ON
11
10
9
8
7
6
L121
DNI
AWS_ON
R100
C154
2.2u
RFOUT_LO
GND3
VCC2
GND2
RFOUT_HI
GND1
CPL
C1
2.2
11
PGND
10
VCC2
9
RFOU
8
CPL_
7
GND
6
CPL_
PGND
VCC2
RFOUT
CPL_IN
GND
R100
CPL_OUT
43
43