Circuit Diagram - LG -E455 Service Manual

7. CIRCUIT DIAGRAM

ASM & GSM-Quad
L102 3.9n
G2 ANT
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
TRX3 0 1 0 1
3G B1, B2 TRX
TRX4 0 0 1 0
3G B5, B8 TRX
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 Triple
B8 W850 TRX (W900)
B1 W2100 TRX(W1900)
LGE Internal Use Only
C197
C196
100p
1.2n
L171 DNI
L170 22n
SW101
L124 3.9n
2
ANT COMMON
1
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
GND6 U101 TRX3
7 20
GND7 TRX2 L175
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
DNI
B8 L114 100p
FL102
L169 2.4n
6 1
W850_W900_TRX ANT RX1
8
RX2
3
TX
L115 L116
2
6.2n
GND1
4 9
DNI
GND2 GND5
5 7
GND3 GND4
C153 5.6p
L119
4.7n
B1
FL103
L120 100p 6 1
ANT RX1
W1900_2100_TRX
8 C161 5.6p
RX2
3
C162
TX
C164
2
DNI 4.7n GND1
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
L178 1.8n
FL100
3 7
PRX_GSM1800_INN
GND2 GSM1800_Bal_OUT2
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
1n
33n
1 9
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
1K
R112
ANT_SEL2
RX_W850_W900_INN
+3V4_VWPAM_MTK
L112
C141
22n
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
0.1u
2.2u
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
L122 6 5
CPL_OUT VEN
L166
DNI
8.2n
R107 R108
PDET
27 27
R109
36
- 201 -
C100 10p
C101 10p
C103 10p
C106 10p
U2
LNA1N
V3
LNA1P
REFCLK1
U4
LNA2N REFCLK2
RX_W850_W900_INN
V5
RX_W850_W900_INP LNA2P REFCLK3
U6
RX_W1900_W2100_INN LNA3N VDDXO
V7
RX_W1900_W2100_INP LNA3P
NC4
U8
LNA4N
V9
LNA4P XO2
U100
XO1/REFIN
U10
PRX_GSM1900_INN LNA5N VTUNE
V11
PRX_GSM1900_INP LNA5P
CLK_MODE
U12
PRX_GSM1800_INN LNA6N VSUP2b
V13
PRX_GSM1800_INP
LNA6P
GND1
U14
PRX_GSM900_INN
LNA7N
V15
PRX_GSM900_INP LNA7P PDET
V17
PRX_GSM850_INN LNA8N TX_IN
U16
PRX_GSM850_INP LNA8P TX_IP
TX_QN
TX_QP
C131 C132
1u
1u
VBATT
C142 C143
1n 2.2u
W850_W900 TX
AFC
C146 33p
W850_W900_TX_IN
PA_R1
PA_R0
L167
PA_ON_W850_W900
22n
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
PT100
100K
7. CIRCUIT DIAGRAM
A2
C115 1n
SYSCLK
B3
A4
B5
+2V8_VTCXO_MTK
A6
B7
A8 C122 1n
MAIN_CLK_26MHz
B9
A10 C125 0.1u
B11 C126 1u
A12
B13
PDET
B17
GSM_UMTSTX_IN
C18
GSM_UMTSTX_IP
D17
GSM_UMTSTX_QN
E18
GSM_UMTSTX_QP
+2V8_VTCXO_MTK
X100
1XXA26000FTA
4 3
VCC OUT MAIN_CLK_26MHz
1 2
VCONT GND
26MHz
C151 C152
DNI 0.1u
+2V8_VTCXO_MTK
R105
39K
RF_TEMP_ADC
R106
215K
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