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
Module Control and Antenna Switch Logic
ANT_SEL 3
ANT_SEL 2
ANT_SEL 1
ANT_SEL 0
Tx Module Mode
0
0
0
0
Standby
0
1
0
0
Rx1
0
0
1
0
Rx2
0
0
1
1
TRX1
0
0
0
1
TRX2
1
0
1
0
Low Band GMSK
1
0
1
1
High Band GMSK
R1006
82
R1004
91
R1007
82
R1010
18
0
VBAT
R1009
33
R1011
18
0
C1028
39p
R1002
2.2K
C1020
100p
100p
C1019
C1018
100p
100p
C1017
U1002
24
17
18
19
13
12
6
5
3
1
2
16
20
15
14
4
22
11
10
9
8
7
23
21
TX_EN
PGND1
GND
GND2
GND3
RX1
RX2
VRAMP
GND5
AN
T
GND6
GPCTRL0
GND7
GND8
GND1
RFIN_LB
RFIN_H
B
GND4
TRX1
TRX2
GPCTRL1
VBATT
GPCTRL2
PGND2
47p
C1014
C1105
33p
C1104
100p
C1013
22u
GSM_PA_RAMP
ANT_SEL0
ANT_SEL3
DCS_PCS_TX
GSM_TX
ANT_SEL1
ANT_SEL2
GSM900(880-915MHz)
GSM850(824-849MHz)
DCS(1710-1785 MHz)
PCS(1850-1910 MHz)
1608
5dB
11dB
2mm
TP1