4. TROUBLE SHOOTING
- 56 -
Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4.6.4 Checking RF Rx Block
Schematic of GSM/DCS/PCS Rx Block
TP2
TP1
FL1001
4
3
2
1
5
10
6
7
8
9
GSM900_Bal_OUT2
GSM900_Bal_OUT1
GSM850_Bal_OUT2
GSM850_Bal_OUT1
GND5
GND4
GSM850/900_IN
GND1
GND2
GND3
FL1002
4
3
2
1
5
10
6
7
8
9
GSM1900_Bal_OUT2
GSM1900_Bal_OUT1
GSM1800_Bal_OUT2
GSM1800_Bal_OUT1
GND5
GND4
GSM1800/1900_IN
GND1
GND2
GND3
L1001
15n
100p
C1046
DNI
L1013
C1005
100n
DNI
C1123
C1126
DNI
L1036 8.2n
8.2n
L1035
L1012
10n
L1008
15n
C1048 10p
10p
C1041
DNI
L1007
8.2p
C1040
L1006
DNI
C1047
39p
8.2n
L1009
1.5n
C1024
C1028
8.2p
C1013 1.5n
3.9n
L1005
U1001
16
15
14
13
12
11
10
17
9
8
7
6
4
3
28
1
44
43
42
41
40
39
38
37
36
35
32
33
34
24
23
22
29
30
31
18
21
25
20
26
19
27
5
2
GND2
GND5
GND13
TRX1
AN
T
TRX2
GND12
TRX3
VRAMP
PGND3
PGND2
PGND1
GND10
TRX
4
GND11
PGND6
PGND5
PGND4
PGND7 PGND8 PGND9
PGND10
PGND11
PGND12
PGND13
PGND14
PGND15
PGND16
GND1
GND14
GND3
GND4
GND6
GND7
GND8
TX_HB_IN
TXEN
TX_LB_IN BS2 BS1 VBAT
T
VC
C
GND9
MODE
R1002
2.2K
L1003
DNI
L1002
2.2n
L1004
4.7n
1.2n
C1022
SW1000
4
3
2
1
ANT
COMMON
G3
G4
C1002 6.8p
100p
C1001
C1003
0.5p
L1037
27n
GSM_PA_RAMP
ANT_SEL0
W850_W900_RTX
W1900_W2100_RTX
GSM_PA_EN
RX_GSM_850_M
RX_GSM_850_P
RX_GSM_900_M
RX_GSM_900_P
RX_DCS_M
RX_DCS_P
RX_PCS_M
RX_PCS_P
GSM(869-894 MHz)
REV_1.1
PCS(1930-1990 MHz)
DCS(1805-1880 MHz)
GSM(925-960 MHz)
TP2
TP1