4. TROUBLE SHOOTING
- 34 -
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
VBAT
C1047
39p
2.2K
R1002
R1012
13
0
47
R1011
R1013
130
75
R1006
R1007
91
U1001
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
R1008
91
47p
C1039
56p
C1049
C1038
22u
C1055
22p
C1042
DNI
DNI
C1044
C1045
DNI
DNI
C1043
GSM_PA_RAMP
ANT_SEL2
ANT_SEL1
ANT_SEL3
ANT_SEL0
GSM_TX
DCS_PCS_TX
WCDMA_900_RTX
WCDMA_2100_RTX
11dB
7dB
PCS(1850-1910 MHz)
1608
DCS(1710-1785 MHz)
GSM850(824-849MHz)
2mm
GSM900(880-915MHz)
TP1