LG E900 Service Manual page 86

R105
GSM_PA_RAMP
2.2K
C182
39p
TP3
R117
DCS_PCS_TX
47
DCS(1710-1785 MHz)
PCS(1850-1910 MHz) 7dB
TP2
R111
GSM_TX
75
GSM850(824-849MHz)
GSM900(880-915MHz)
11dB
2mm
+VPWR
C155
C216
10u 47p
ANT_SEL0
ANT_SEL1
ANT_SEL2
ANT_SEL3
C178 1n
C176 1n
C173 1n
C171 1n
0603
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TP1
ENWY0008701 (2.3X2.3X1.4)
SW102
2 C174 33p
ANT COMMON
1
G3 G4
3 4
L135
100n
44
PGND16
43
PGND15
42
PGND14
1 41
DCS_PCS_IN PGND13
2
GND1
3
GSM_IN
4
VAPC
5 22
VBATT GND5
6 21
BS2 GND4
U104
7 20
BS1 GND3
8 SKY77544 19
_TXEN GND2
18
SMRH0006201
ANT
17
WCDMA3
29 16
PGND1 WCDMA2
30 15
PGND2 WCDMA1
31
PGND3
32
PGND4
33
PGND5
34 40
PGND6 PGND12
39
PGND11
38
PGND10
Schematic of GSM/DCS/PCS Tx Block
- 87 -
4. TROUBLE SHOOTING
WCDMA_2100_RTX
WCDMA_1700_1900_RTX
WCDMA_850_900_RTX
C180
2 3
FL109
C210 1n
G1 O1
1
IN
G2 O2
5 4
C181
L130
881.5MHz
DNI
C203
2 3
C212 1.2n FL110
G1 O1
1
IN
G2 O2
5 4
L131
C190
DNI
942.5MHz
C205
2 3
FL111
C213 1n
G1 O1
1
IN
G2 O2
5 4
L132 C209
1842.5MHz
DNI
C211
2 3
FL112
C214 33p G1 O1
1
IN
G2 O2
5 4
L133
C206
DNI
1960MHz
2p
RX_GSM_850_M
L134
GSM(869-894 MHz)
18n
2p
RX_GSM_850_P
1.8p
RX_GSM_900_M
L129
GSM(925-960 MHz)
18n
1.8p
RX_GSM_900_P
2.2p
RX_DCS_M
DCS(1805-1880 MHz)
L128
4.7n
2.2p
RX_DCS_P
2.7p
RX_PCS_M
PCS(1930-1990 MHz)
L127
4.7n
2.7p
RX_PCS_P
LGE Internal Use Only