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4. TROUBLE SHOOTING
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Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Schematic of the Antenna Switch Block
CTL1
CTL2
CTL3
CTL4
GSM LB TX
L
H
L
H
GSM HB TX
H
L
L
L
NC
L
H
L
L
GSM1800 RX
L
L
H
L
GSM1900 RX
L
H
H
L
UMTS B1
H
L
H
H
UMTS B2
H
L
L
H
UMTS B8
L
L
L
H
NC
H
H
L
H
UMTS B4
L
L
H
H
U850_G850 RX
H
H
H
H
TP2
TP3
TP4
TP5
1K
R11003
0
R11002
1K
R11004
1K
R11005
1K
R11006
FL11012
EAT61793401
LMSWBPGF-D49
MURATA
24
23
22
21
20
19
18
17
16
15
14
13
12
29
11
30
10
31
9
32
8
33
7
34
6
5
4
3
25
2
26
1
27
28
GND8
GND7
B1TX
B1RX2
GND1
B1RX
1
B2TX
B8TX
GSM1800/1900T
X
GSM850/900T
X
GND10
GND2
GND9
AN
T
GSM850RX2
GND3
GSM850RX1
VDD
GSM1800/1900RX2
CTL1
GSM1800/1900RX1
CTL2
CTL3
CTL4
TRX1
TRX2
TRX3
B8RX
1
B8RX
2
GND4
GND5
B2RX
1
B2RX
2
GND6
C11022
1n
VDD_RF_SW
ANT_SW_SEL0
ANT_SW_SEL3
ANT_SW_SEL2
RX_GSM_HB_M
RX_GSM_HB_P
TX_GSM_HB
TX_ANT_LU2100
TX_ANT_U900
RX_UG900_M
RX_UG900_P
TRX_ANT_LU4
TX_ANT_LU1900
RX_LU1900_M
RX_LU2100_P
TX_GSM_LB
RX_LU2100_M
TRX_ANT_UG850
ANT_SW_SEL1
RX_LU1900_P
Rev.D
TP1
TP2
TP3
TP4
TP5