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3. TROUBLE SHOOTING
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Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Schematic of the Antenna Switch Block
Check TP1~7 (High Level)
1.4V < Voltage < 3.0V
Check the TP8,9
No
Yes
Check the ANT Logic in each mode
8.2n
L112
9
C1110
4.7u
C1145
3.9p
C1113
10u
DNI
L1105
L1138
2n
100p
C1112
L1106
DNI
22p
C1109
+VPA_BATT0
+VPA_BATT0
DNI
C1118
C1116
DNI
DNI
C1115
C1117
DNI
DNI
C1121
2n
L1139
DNI
C1120
C1119
DNI
C1114
0.1u
8.2n
L1128
U1100
EAT62073401
SKY77573-31
43
42
41
40
39
37
38
35
36
34
26
27
28
29
30
31
32
33
23
22
9
12
7
20
21
19
15
2
18
8
10
11
14
16
17
13
1
25
6
5
4
3
24
TRX1
GND3
VCC1
VCC2
GND4
GND17
GND1
GND11
GND14
GND13
GND12
GND9
GND8
GND6
RX
1
GND2
AN
T
SPDT_IN
SPDT_OU
T
RX
2
GND5
GND10
GND7
GND15
GND16
NC1
VBATT
GND20
TRX4
GND19
TRX3
GND18
TRX2
NC2
RF_I
N
SPD
T
SW
0
SW
1
HB_E
N
LB_E
N
MODE
0
MODE
1
PGND
PA0_R_0
PA0_R_1
WTR_TX1_OUT
SPDT_SEL
ANT0_SW_SEL_0
ANT0_SW_SEL_1
ANT0_SW_SEL_2
ANT0_SW_SEL_3
TX_MODULE_TRX_2
TX_MODULE_TRX_1
TX_MODULE_TRX_4
for W7 CI (06/07)
RX_G1800
RX_G1900
TP2
TP1
TP3 TP4
TP5
TP9
TP8
TP7
TP6