Circuit Diagram - LG -E450 Service Manual

7. CIRCUIT DIAGRAM

ASM & GSM-Quad
L102 3.9n
G2 ANT ANT
1
G1
C110 C111
SW100
DNI DNI
External Clock for main RF
26MHz
External Clock for BT / WIFI 26MHz
Mode
PA_EN ANT_SEL0 ANT_SEL1 ANT_SEL2
Stand-by 0 0 0 0
GSM850/900 RX TRX1 0 1 0 0
GSM1800/1900 RX TRX2 0 1 1 0
3G B1, B2 TRX TRX3 0 1 0 1
3G B5, B8 TRX TRX4 0 0 1 0
GSM850/900 TX TX_LB 1 0 0 1
GSM1800/1900 TX TX_HB 1 0 1 1 DCS_PCS_TX
1 : Min 1.2 V / Max 2.9v
0 : Min -0.1V / Max 0.3V
GSM850_GSM900_TX
WCDMA
LGE Internal Use Only
C197
C196
100p
1.2n
L171 DNI
L170 22n
SW101 L124
3.9n
2
COMMON
L174
G3 G4
3 4 L125
C105
100n
1p
44
PGND16
43
PGND15
42
PGND14
1 41
GND1 PGND13
2
GND2
3
GND3
4
GND4
5 22
GND5 GND10
6 21
U101
GND6 TRX3
7 20
GND7 TRX2
8 19
GND8 TRX1
18
VRAMP
17
TXEN
29 16
PGND1 MODE
30 15
PGND2 GND9
31
PGND3
32
PGND4
33
PGND5
34 40
PGND6 PGND12
39
PGND11
38
PGND10
C135 100p
C134
DNI
2mm
VBATT
C119 C118 C120
6.8p 1n 22u
C129 100p
C128
DNI
L111 100p
L113
L112
DNI 22n
B8 L114 100p
FL102
L169 2.4n
6 1
W850_W900_TRX ANT RX1
8
RX2
3
L116 TX
L115
2
6.2n
GND1
DNI 4 9
GND2 GND5
5 7
GND3 GND4
C153 5.6p
L119
4.7n
B1
REV.C
FL103
L120 100p
6 1
ANT RX1
W1900_2100_TRX
8 C161 5.6p
RX2
3
C162 TX
C164 2
DNI GND1
4.7n 4 9
GND2 GND5
5 7
GND3 GND4
L176 1.5n
PRX_GSM1900_INN
L101
1n
1 9 5.6n
GSM1800/1900_IN GSM1900_Bal_OUT2
L177 1.5n
2 8
PRX_GSM1900_INP
GND1 GSM1900_Bal_OUT1
FL100 L178 1.8n
3 7
GND2 GSM1800_Bal_OUT2 PRX_GSM1800_INN
L103
3.9n 4 6
GND3 GSM1800_Bal_OUT1 L105
5.6n
L179 1.8n
PRX_GSM1800_INP
L180 4.7n
PRX_GSM900_INN
L107
L175
1n
1 9 33n
GSM850/900_IN GSM900_Bal_OUT2
L181 4.7n
2 8
GND1 GSM900_Bal_OUT1 PRX_GSM900_INP
L182 4.7n
3 7
PRX_GSM850_INP
GND2 GSM850_Bal_OUT2
L108
4 6
GND3 GSM850_Bal_OUT1
8.2n L110
33n
L183 4.7n
PRX_GSM850_INN
R102
GSM_PA_RAMP
1K
C133
39p
R100
GSM_PA_EN
1K
C169
39p
R110 1K
ANT_SEL0
R111 1K
ANT_SEL1
R112 1K
ANT_SEL2
RX_W850_W900_INN
+3V4_VWPAM_MTK
C141
0.1u
RX_W850_W900_INP
B8
U102
11
PGND
10 1
L172 1.2n
VCC VBAT
9 2
RF_OUT RF_IN
8 3
CPL_IN VMODE1
7 4
C198 GND VMODE0
L148 R104
6 5
CPL_OUT VEN
0.5p
DNI 49.9
RX_W1900_W2100_INN
C154
+3V4_VWPAM_MTK
DNI
C155 DNI
C193 C157
2.2u 0.1u
C158
B1
DNI
U103
RX_W1900_W2100_INP
11
PGND
10 1
VCC VBAT
C163 3.3p
9 2
RF_OUT RF_IN
8 3
CPL_IN VMODE1
7 4
GND VMODE0
6 5
L122 CPL_OUT VEN
L166
DNI
8.2n
R107 R108
PDET
27 27
R109
36
- 202 -
C100 10p
C101 10p
C103 10p
C106 10p
U2
LNA1N
V3
LNA1P
REFCLK1
U4
RX_W850_W900_INN LNA2N REFCLK2
V5
RX_W850_W900_INP LNA2P REFCLK3
U6
RX_W1900_W2100_INN LNA3N
V7
RX_W1900_W2100_INP LNA3P
U8
LNA4N
V9
LNA4P
U100
XO1/REFIN
U10
PRX_GSM1900_INN LNA5N
V11
PRX_GSM1900_INP LNA5P
CLK_MODE
U12
PRX_GSM1800_INN LNA6N
V13
PRX_GSM1800_INP LNA6P
U14
PRX_GSM900_INN LNA7N
V15
PRX_GSM900_INP LNA7P
V17
PRX_GSM850_INN LNA8N
U16
PRX_GSM850_INP LNA8P
C131 C132
1u 1u
VBATT
C142 C143
1n 2.2u
W850_W900 TX
C146 33p
W850_W900_TX_IN
PA_R1
PA_R0
L167
PA_ON_W850_W900
22n
AFC
VBATT
C159 C160
W1900_W2100 TX
1n 2.2u
L173 1.2n
W1900_2100_TX_IN
PA_R1
PA_R0
C199
PA_ON_W1900_2100
0.5p
7. CIRCUIT DIAGRAM
A2 C115 1n
SYSCLK
B3
A4
B5
VDDXO +2V8_VTCXO_MTK
A6
NC4
B7
XO2
A8 C122 1n
MAIN_CLK_26MHz I
B9
VTUNE
A10 C125 0.1u
B11
C126 1u
VSUP2b
A12
GND1
B13
PDET PDET
B17
GSM_UMTSTX_IN
TX_IN
C18
TX_IP GSM_UMTSTX_IP
D17
GSM_UMTSTX_QN
TX_QN
E18
TX_QP GSM_UMTSTX_QP
+2V8_VTCXO_MTK
X100
1XXA26000FTA
4 3
MAIN_CLK_26MHz
VCC OUT
1 2
VCONT GND
26MHz
C151 C152
DNI 0.1u
+2V8_VTCXO_MTK
R105
39K
RF_TEMP_ADC
PT100 R106
100K
215K
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