LG E900 Service Manual page 74

GSM_PA_RAMP
DCS_PCS_TX
DCS(1710-1785 MHz)
PCS(1850-1910 MHz)
GSM850(824-849MHz)
GSM900(880-915MHz)
+VPWR
FL102 B7953
RX1
C140 1.5n C138 100p 6
WCDMA_850_900_RTX ANT RX2
TP2
TX
L110
2
GND1
27n
4
GND2 GND4
5
GND3 GND6
SDMY0002801
FL103 SAYFP1G95AA0B00
C141 33p C142 6.8p 6
WCDMA_2100_RTX ANT RX
TP2
TX
L113
2.2n
2
GND1 GND6
4
GND2 GND5
5
GND3 GND4
SDMY0001901
FL114 ACMD-7407
L137 33p C242 1n
6
WCDMA_1700_1900_RTX ANT RX
TP2
TX
C232
DNI
2
GND1 GND6
4
GND2 GND5
5
GND3 GND4
SDPY0004701
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
R105
2.2K
C182
39p
R117
47
7dB
R111
GSM_TX
75
11dB
2mm
C155
C216
10u 47p
ANT_SEL0
ANT_SEL1
ANT_SEL2
ANT_SEL3
C178 1n
C176 1n
C173 1n
C171 1n
0603
1
W850 TX(824 - 849 MHz)
8
W900 TX(880 - 915 MHz)
3 C148 33p
TP3
7
9
C139 1.5p C101 100p
RX_WCDMA_850_900_P
L115
L111
DNI 18n
C143 1.5p C134 100p
RX_WCDMA_850_900_M
1
W2100 TX(1920 -1980 MHz)
3 C105 33p
TP3
9
8
7
C144 33p C145 33p
RX_WCDMA_2100
L112
1.8n
W1900 Tx (1850-1910MHz)
1
3
TP3
9
C231
8
6.8n
7
PDET_IN
W1900 Rx (1930-1990MHz)
ENWY0008701 (2.3X2.3X1.4)
SW102
C174
2
ANT COMMON
1
G3 G4
3 4
1
DCS_PCS_IN
2
GND1
3
GSM_IN
4
VAPC
5
VBATT
6
BS2
U104
7
BS1
8
SKY77544
_TXEN
SMRH0006201
29
PGND1
30
PGND2
31
PGND3
32
PGND4
33
PGND5
34
PGND6
W900
C103 C127
100p
4.7u
U101 ACPM-5208
11
PGND
10 1
L120 2.7n
VCC2 VCC1
9 2
RFOUT RFIN
R101 8 3
ISO VBP
49.9 7 4
C147 C106
GND VMODE
6 5
REV.B
2.2p CPL VEN
15n
SMPY0021901
C122
REV.B
100p
C132 C107
100p W2100 4.7u
U102
SKY77701
11
PGND
10 1
VCC2 VCC1
L119 1n 9 2
RFOUT RFIN
8 3
CPL_IN VMODE_1
7 4
C121
C111 GND VMODE_0
6 5
DNI
CPL_OUT VEN
0.5p
C131
REV.B SMPY0022701
DNI
C108
REV.B
100p
C236
4.7u
W1900
U103 SKY77702
11
REV.B PGND
10 1
VCC2 VCC1
C129 100p
L138 4.7p
9 2
RFOUT RFIN
8 3
CPL_IN VMODE_1
7 4
GND VMODE_0
C233
6 5
CPL_OUT VEN
0.5p
SMPY0022801
C125 C238
100p
DNI
about 9.5 dB
R104
68
R102 R103
100 100
U100
L136 2.2n BGA711L7
C234 10p C113 2.7n
1 6
RFIN RFOUT
2 5 R125
EN RREF
0603
27K
EUSY0365401
3 4
GS VCC
C230 L140
2.7n
0.5p
7
C244
C246
10n
100p
- 75 -
4. TROUBLE SHOOTING
TP1
33p
L135
100n
44
PGND16
43
PGND15
42
PGND14
41
PGND13
22
GND5
21
GND4
20
GND3
19
GND2
18
ANT
17
WCDMA3
16
WCDMA2
15
WCDMA1
40
PGND12
39
PGND11
38
PGND10
+VPWR
1608
FL107 SFSY0037501
L107 2.7n L104 3.3n
C119 33p
4 1
OUT IN
TP4
G3 G2 G1
WCDMA_PA_R0
C135 L106
5 3 2
REV.B
W_850_900_ON DNI SAFEB897MAM0F00
DNI
C124
100p
0603
+VPWR
1608
FL105 SFSY0028101
3
C118 L105
G3 C115 3n
4 1
OUT IN
1.8n
TP4 33p G2 G1
5 2
C136
WCDMA_PA_R0 C117
SAFEB1G95KA0F00
WCDMA_2100_ON REV.B DNI
DNI
C104
100p
0603
+VPWR
C240
1n
FL113 3 SFSY0034701
G3
C235 1.5n C239 3n
4 1
OUT IN WCDMA_1700_1900_TX_OUT
G2 G1
TP4
5 2
WCDMA_PA_R0
SAFEA1G88KB7F00
C241
W_1700_1900_ON
10n
C237
100p
W1900
L141 3.9n
RX_WCDMA_1700_1900_M
FL115 SFSY0034901
C245
1 3 C248 C247
IN OUT
DNI
4 DNI
10p _OUT
G1 G3
L139
C249 2 5 L142 3.9n
B9419
8.2n
DNI
RX_WCDMA_1700_1900_P
VREG_TCXO_2.85V
R131 0
ANT_SEL2
R132 DNI
W_LNA_EN
LGE Internal Use Only
W900
WCDMA_850_900_TX_OUT
C116
DNI
W2100
WCDMA_2100_TX_OUT
C114
3.9n