LG E900 Service Manual page 77

4. TROUBLE SHOOTING
FL102 B7953
RX1
C140 1.5n
C138 100p 6
WCDMA_850_900_RTX ANT RX2
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
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
TX
C232
DNI
2
GND1 GND6
4
GND2 GND5
5
GND3 GND4
SDPY0004701
LGE Internal Use Only
TP3
1
W850 TX(824 - 849 MHz)
8
W900 TX(880 - 915 MHz)
C148 33p
3
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
TP3
1
W2100 TX(1920 -1980 MHz)
3 C105 33p
9
8
7
C144 33p C145 33p
RX_WCDMA_2100
L112
1.8n
TP3
W1900 Tx (1850-1910MHz)
1
3
9
C231
8
6.8n
7
PDET_IN
W1900 Rx (1930-1990MHz)
W900
C103 C127
100p
4.7u
U101 ACPM-5208
11
PGND
10 1
L120 2.7n
VCC2 VCC1 TP2
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 TP2
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
TP2
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
- 78 -
Copyright © 2010 LG Electronics. Inc. All right reserved.
+VPWR
1608
TP1
FL107 SFSY0037501
L107 2.7n L104 3.3n
C119 33p
4 1
OUT IN
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
TP1
FL105 SFSY0028101
3
C118 L105
G3 C115 3n
4 1
OUT IN
1.8n
33p G2 G1
5 2
C136
WCDMA_PA_R0 C117
SAFEB1G95KA0F00
WCDMA_2100_ON REV.B DNI
DNI
C104
100p
0603
+VPWR
C240
1n
TP1
FL113 3 SFSY0034701
G3
C235 1.5n C239 3n
4 1
OUT IN WCDMA_1700_1900_TX_OUT
G2 G1
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
Only for training and service purposes
W900
WCDMA_850_900_TX_OUT
C116
DNI
W2100
WCDMA_2100_TX_OUT
C114
3.9n