- 54 -
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
WCDMA Tx Path Circuit Diagram
1880,1960MHz
B7686
FL101
7
9
2
5
4
8
1
3
6
ANT
TX_IN
RX_OUT1
RX_OUT2
GND1
GND2
GND4
GND3
GND5
R103
49.9
2
1
C138
2.2p
1
2
C142 1.8n
2
1
C117
33p
1
2
2.7n
C118
2
1
DNI
C159
1
2
L107
10n
0
C123
2
1
DNI
C181
1
2
L108 33p
1
2
L109 33p
1
2
0.5p
C124
1
2
L110 DNI
1
2
FL102
836.5MHz
B9425
5
3
2
4
1
IN
OUT
G1
G2
G3
DNI
C156
1
2
L111
DNI
1
2
2.2p
C134
1
2
DNI
C127
1
2
1n
C128
2
1
DNI
C129
1
2
0
0
1
7
0
1
R
2
1
8
0
1
R
0
0
1
2
1
2.2u
C130
1
2
DNI
C132
1
2
DNI
C133
1
2
0.5p
L122
1
2
3.3n
C144
2
1
L121
DNI
1
2
1.8n
C116
2
1
C135
DNI
1
2
DNI
C136
1
2
0
4
1
1
R
2
1
1p
L115
1
2
C139
1n
1
2
1n
C140
1
2
DNI
C141
1
2
DNI
C125
1
2
DNI
L116
1
2
DNI
L117
1
2
DNI
L123
1
2
33p
C143
1
2
L119
DNI
2
1
4.7p
L120
1
2
C149 DNI
1
2
C145
680p
1
2
C146
680p
1
2
+VPWR
+VPWR
C147
330p
1
2
C126
0
2
1
R109
68
2
1
+VPWR
B7671
FL103
836.5 MHz,881.5 MHz
9
5
7
3
1
2
8
4
6
ANT
GND2
RX_OUT2
GND1
RX_OUT1
TX_IN
GND4
GND3
GND5
10n
L118
2
1
4.7n
C150
2
1
12n
C160
2
1
ACPM-5201
U102
6
5
7
4
8
3
9
2
10
1
11
PGND
VCC1
VCC2
RFIN
RFOUT
VBP
ISO
VMODE
GND
VEN
CPL
1.5n
C119
2
1
2.2u
C151
1
2
L124
DNI
1
2
C155
1n
1
2
C137
DNI
1
2
B9414
FL104
1950MHz
5
3
2
4
1
IN
OUT
G1
G2
G3
C158
330p
1
2
+VPWR
8.2p
C148
1
2
6.8n
R111
2
1
B7696
FL106
1950 MHz,2140 MHz
9
5
7
4
1
2
8
3
6
ANT
TX_IN
RX_OUT2
GND1
RX_OUT1
GND2
GND4
GND3
GND5
DNI
L125
2
1
U104
ACPM-5305
6
5
7
4
8
3
9
2
10
1
11
PGND
VEN
CPL
VMODE
GND
VBP
ISO
RFIN
RFOUT
VCC1
VCC2
DNI
C173
1
2
C180
DNI
1
2
PA_R0
PA_R0
WLNA_HB2_IN_M
WLNA_HB2_IN_P
WLNA_LB_IN_P
WLNA_LB_IN_M
WCDMA_2100_TX_OUT
WCDMA_900_TX_OUT
WLNA_HB1_IN_M
WLNA_HB1_IN_P
WCDMA_PA_ON1
PWR_DET
PA_R1
PA_R1
WCDMA_2100
PCS_IN_P
PCS_IN_M
WCDMA_LB
WCDMA_PA_ON0
WCDMA_1900
WCDMA_1900_TX_OUT
WCDMA_1900
WCDMA_2100
WCDMA_850/900
WCDMA_2100
WCDMA_850/900
WCDMA_1900
VREG_MSMP_2.6V
100n
L101
C175
15p
C110 33p
L106
15n
C122
33p
R110
1n
SW101
RF-800
G2
ANT
RF
G1
0
C163
FL105
85090019002100
6
5
4
3
7
9
11
20
24
22
23
21
13
12
14
10
15
8
1
18
19
2
16
17
PCN_RX2
PCN_RX1
ANT
PCS_RX2
PCS_RX1
GND1
GND2
GSM850_RX_EGSM_RX2
GND3
GSM850_RX_EGSM_RX1
GND4
GND5
WCDMA_850
GND6
WCDMA_1900
GND7
WCDMA_2100
GSM850_EGSM_TX
PCN_PCS_TX
D
D
V
1
L
R
T
C
2
L
R
T
C
3
L
R
T
C
4
L
R
T
C
10n
C105
C104
1p
ANT102
ANTENNA_PAD
ANTENNA_PAD
ANT101
ANT_SEL[0]
ANT_SEL[1]
ANT_SEL[2]
ANT_SEL[3]
T
P9
T
P7
T
P5
T
P3
T
P
1
T
P8
T
P6
T
P4
T
P2