4. TROUBLE SHOOTING
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Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Schematic of GSM/DCS/PCS Tx Block
MBV62422401
ANT100
2
FEED
C1118
6.8p
100p
C1127
MBV62422401
ANT1001
FEED
15n
L1001
C1128
100p
100p
C1046
75
R1006
91
R1007
C1005
100n
R1008
91
R1013
13
0
R1011
47
R1012
13
0
C1010
0.75p
DNI
C1007
DNI
C1124
8.2n
L1009
C1039
100p
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
TRX4
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_I
N
BS2 BS1 VBAT
T
VC
C
GND9
MODE
VBAT
L1037
8.2n
C1003
DNI
DNI
C1125
L1004
4.7n
10u
C1038
C1022 1.2n
SW1000
4
3
2
1
ANT
COMMON
G3
G4
C1002 6.8p
100p
C1001
ANT_SEL2
ANT_SEL1
W850_W900_RTX
W1900_W2100_RTX
DCS_PCS_TX
GSM850_GSM900_TX
GSM900(880-915MHz)
REV_1.1
2mm
GSM850(824-849MHz)
DCS(1710-1785 MHz)
PCS(1850-1910 MHz)
7dB
11dB
TP1
TP2
TP3