LG LG-E400 - Page 60

4. TROUBLE SHOOTING
- 60 -
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
C1043
22u
C1044
47p
U101
24
17
18
19
13
12
6
5
3
1
2
1620
51 4
1 4
22
11
10
9
8
7
23
21
TX_EN
PGND1
GND
GND2
GND3
RX1
RX2
VRAMP
5DNG
T
NA
6
D
N
G
GPCTRL0
GND7
GND8
GND1
B
L
_NIFR
B
H
_NIFR
GND4
TRX1
TRX2
GPCTRL1
VBATT
GPCTRL2
PGND2
5401C p001
p00
1
740
1
C
840
1
C p00
1
p
00
11
50
1
C
C1091
56p
2.2K
R107
C1092
22p
39p
C1024
031
2
11
R
47
R113
0
31
4
11
R
VBAT
75
R116
1
9
5
11
R
1
9
7
11
R
GSM_PA_RAMP
ANT_SEL2
ANT_SEL1
GSM_TX
DCS_PCS_TX
ANT_SEL3
WCDMA_2100_RTX
WCDMA_900_RTX
ANT_SEL0
2mm
11dB
7dB
8
0
6
1
PCS(1850-1910 MHz)
DCS(1710-1785 MHz)
GSM850(824-849MHz)
GSM900(880-915MHz)
TP1