4. TROUBLE SHOOTING
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Copyright © 01 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
Rx
0
0
1
1
TRX1
0
0
0
1
TRX
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
16
20
51
41
4
22
11
10
9
8
7
23
21
TX_EN
PGND1
GND
GND2
GND3
RX1
RX2
VRAMP
5
D
N
G
T
N
A
6
D
N
G
GPCTRL0
GND7
GND8
GND1
BL
_
NI
F
R
B
H_
NI
F
R
GND4
TRX1
TRX2
GPCTRL1
VBATT
GPCTRL2
PGND2
54
01
C
p0
01
p0
01
74
01
C
84
01
C
p0
01
p0
01
15
01
C
C1091
56p
2.2K
R107
C1092
22p
39p
C1024
03
1
21
1
R
47
R113
03
1
41
1
R
VBAT
75
R116
19
51
1
R
19
71
1
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
80
61
PCS(1850-1910 MHz)
DCS(1710-1785 MHz)
GSM850(824-849MHz)
GSM900(880-915MHz)
TP1