Circuit Diagram - LG -E445 Service Manual

7. CIRCUIT DIAGRAM

ASM & GSM-Quad
ANT101 ANT102
C101 DNI
SW101
C103 C109 100p
100p 2
ANT COMMON
1
G3 G4
C120 C115
C119
18n 3 4
1p
100p
DNI C116
Mode Tx_EN ANT_SEL0 ANT_SEL1 ANT_SEL2
Stand-by 0 0 0 0
0 0 0 1
Rx1
0 0 1 0
Rx2
DCS_PCS_TX
3G1(W_LB) 0 1 0 1
3G2(W_HB) 0 1 0 0
1 0 0 1
TX_LB
1 0 1 0
TX_HB
GSM850_GSM900_TX
WCDMA
B1 W2100 TRX(W1900)
L109
W1900_2100_TRX
1.8n
C156
L110
DNI
2.7n
B8 W900 TRX (W850)
C176
W850_W900_TRX
18p
L117
DNI
LGE Internal Use Only
C117 1.5n
L103
C110 1.5n
4.7n
L102
C118
100n
DNI
GND12 GND6
25
16
GND13 TRX3 C130 1.2n
26 15
GND14 TRX2
27
U102 14
GND15 GND5
28 13
GND16 GND4
29 12
GND17 GND3
30 11
L106
GND18 VBATT
31 10
12n
GND
C144 100p
C145 C146
DNI
DNI
C179 C180 C181
C137 100p
100p 100p 100p
R102
GSM_PA_RAMP
C139 C140
10K
C143 R101
DNI DNI
220p
24K
C147
RX_W1900_W2100_INN
5p
C148
DNI C149
L108
4.7n
C150 DNI
C153 DNI
FL103
RX_W1900_W2100_INP
5p
6 1
ANT RX1
8
RX2
3
C157
TX
2
GND1
4 9
C160
GND2 GND5
5 7
GND3 GND4 7.5n
PDET
L112
RX_W850_W900_INN
1.5n
L114 L113
DNI
15n
L116
RX_W850_W900_INP
1.5n
FL104
6 1
ANT RX1
8
RX2
3
L118 TX
2
5.1n
GND1
4 9
GND2 GND5
5 7
GND3 GND4
C106 1.5n
PRX_GSM1900_INN
FL101
L101
1 IN 9
O1_1 4.7n
C122 1.5n
8
O1_2 PRX_GSM1900_INP
7
O2_1
PRX_GSM1800_INN
C123 1n
C_C5 O2_2
4 6
L104
2 3 5 10 3.9n
C125 1n RX_W850_W900_INN
PRX_GSM1800_INP
RX_W850_W900_INP
RX_W1900_W2100_INN
C126 1n
PRX_GSM900_INN
RX_W1900_W2100_INP
FL102
L105
1 IN 9
O1_1
15n
C132 1n
8
O1_2 PRX_GSM900_INP PRX_GSM1900_INN
C133 1n
7
O2_1
PRX_GSM850_INP PRX_GSM1900_INP
4 GND O2_2 6
PRX_GSM1800_INN
L107
PRX_GSM1800_INP
18n
2 3 5 10
GND
C136 1n
PRX_GSM900_INN
PRX_GSM850_INN
PRX_GSM900_INP
2mm
PRX_GSM850_INN
PRX_GSM850_INP
VBATT
C129 C127
22u
39p
ANT_SEL1
ANT_SEL2
ANT_SEL0
GSM_PA_EN
C138
100p
VBATT
+3V4_VWPAM_MTK
C161 C162 C152 C151
1n 2.2u
2.2u 1n
U103
11
PGND
Close to pin1
10 1
VCC2 VCC1
3.9p 9 2
RFOUT RFIN
8 3
PA_R1
ISO NC
7 4
GND VMODE PA_R0
L111 6 5
PA_ON_W1900_2100
DNI CPL VEN
C165 C166
100p 100p
R106 R107
27 27
R108
36
VBATT
+3V4_VWPAM_MTK
C167 C168
1n
2.2u
C171
1n
U104
11
PGND
10 1 Close to pin1
VCC2 VCC1
C177 1.8n
9 2
RFOUT RFIN
8 3
ISO NC PA_R1
7 4
PA_R0
GND VMODE
C178 L119 6 5
CPL VEN PA_ON_W850_W900
18n
1.8p
R111
C174 C175
49.9
100p 100p
- 185 -
C102 10p
C104 10p
C107 10p
C111 10p
U2
LNA1N
V3
LNA1P
A2 C124 1n
REFCLK1
U4 B3
LNA2N REFCLK2
V5 A4
LNA2P REFCLK3
U6 B5
LNA3N VDDXO
V7
LNA3P
A6
NC4
U8
LNA4N
V9 B7
LNA4P XO2
U101 A8 C131
XO1/REFIN
U10 B9
LNA5N VTUNE
V11
LNA5P
A10
CLK_MODE
U12 B11
LNA6N VSUP2b C135 1u
V13
LNA6P
A12
GND1
U14
LNA7N
V15 B13
LNA7P PDET
V17 B17
LNA8N TX_IN
U16 C18
LNA8P TX_IP
D17
TX_QN
E18
TX_QP
C141 C142
1u 1u
+2V8_VTCXO_MTK
X101
1XXA26000FTA
4
W1900_W2100 TX VCC
1
AFC VCONT
26MHz
C154
C155
C158 4.7p
DNI
W1900_2100_TX_IN 0.1u
C163 C164
DNI
6.8n
+2V8_VTCXO_MTK
W850_W900 TX
100K
L115 100p
W850_W900_TX_IN
C172 C173
10n DNI
7. CIRCUIT DIAGRAM
SYSCLK
+2V8_VTCXO_MTK
1n
MAIN_CLK_26MHz
C134
0.1u
PDET
GSM_UMTSTX_IN
GSM_UMTSTX_IP
GSM_UMTSTX_QN
GSM_UMTSTX_QP
3
MAIN_CLK_26MHz
OUT
2
GND
RF_TEMP_ADC
Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes