4. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
4.4 Checking GSM TX Module(GSM PAM + FEM) Block
4.4 Checking GSM TX Module(GSM PAM + FEM) Block
Schematic of the TX Module
VBAT(TP1)
TP1
VBAT(TP1)
50
01
R
03
1
40
01
R
03
1
SW1001
4
3
2
1
ANT
COMMON
G3
G4
1.8n
C1094
R1003
47
C1033
10u
DNI
L1043
2.7n
C1106
DNI
L1042
C1009
100p
33
R1006
1n
C1049
U1001
GND1
2
VBATT
5
01
D
N
G
72
GND2
19
9
D
N
G
62
GND3
20
8
D
N
G
52
GND4
21
ANT
18
PGND3
31
PGND2
30
PGND1
29
GND5
22
6
D
N
G
32
7
D
N
G
42
PGND6
34
PGND5
33
PGND4
32
7
D
N
G
P
53
8
D
N
G
P
63
9
D
N
G
P
73
PGND10
38
PGND11
39
PGND12
40
PGND13
41
PGND14
42
PGND15
43
PGND16
44
HB_IN
1
11
D
N
G
82
LB_IN
3
VAPC
4
BS2
6
BS1
7
TXEN_
8
E
D
O
M
9
WCDMA3
17
P
M
E
T
01
4
X
R
11
3
X
R
21
2
X
R
31
1
X
R
41
WCDMA1
15
WCDMA2
16
R1000
2.2K
L1001
DNI
VBAT
FL1001
3
2
1
4
IN_1842_5
IN_1960
GND1
GND2
100n
L1002
80
01
R
19
47p
C1034
C1051
1n
C1052
1n
C1050
1n
90
01
R
19
C1024
39p
FL1000
3
2
1
4
IN_881_5
IN_942_5
GND1
GND2
DNI
L1000
C1013
100p
3.9n
C1018
L1005
DNI
C1056
2.4n
DNI
L1009
C1058
18p
4.7n
L1012
SW1000
G1
ANT
G2
ANT_SEL[2]
ANT_SEL[1]
GSM_PA_RAMP
WCDMA_LB_RTX
ANT_SEL[3]
GSM_LB_TX
GSM_HB_TX
ANT_SEL[0]
WCDMA_HB_RTX
GSM850(824-849MHz)
GSM900(880-915MHz)
FEM
2mm
7.4dB
7dB
PCS(1850-1910 MHz)
DCS(1710-1785 MHz)
0603
0603
0603
TP1