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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
4. Trouble
Shooting
4. 9. GPS Part
4 9 2 Checking GPS RF Signal path
4. 9. 2. Checking GPS RF Signal path
Test Point
TP2
TP1
TP2
TP3
Circuit Diagram
TP1
TP2
92
TP3
C1149
100p
L1142
DNI
DNI
L1138
100p
C1160
C1159
100p
DNI
L113
9
L1150
8.2n
100p
L1149
DNI
L1146
DNI
L1141
C1151
100p
FEED
ANT1104
FEED
ANT1105
L1134
2.2n
+2V75_VREG_L14
10
TOL=0.01
R1104
6.8p
C1143
C1145
0.1u
C1144
33p
R1103
820
IN
1
OUT
4
G1
2
G2
3
G3
5
FL1109
L114
3
82
n
2
1
DNI
L114
0
C1148 100p
GND3
VD
D
VCTR
L
RFIN
RFOUT2
GND1
RFOUT1
GND2
SFMG2B0D001
FL1108
4
5
3
6
2
7
1
8
GNSS_ELNA_EN
GNSS_IN_N
GNSS_IN_P
( DGMS Guide )
MC-C00002-14 : ESD Protection Circuit
ANT3 GNSS
NEAR TO WTR
ANT3
100p
L1145
L1153
DNI
C1149
100p
L1142
DNI
DNI
L1138
100p
C1160
C1159
100p
DNI
L113
9
L1150
8.2n
100p
L1149
DNI
L1146
DNI
L1141
C1151
100p
FEED
ANT1104
FEED
ANT1105
L1134
2.2n
+2V75_VREG_L14
10
TOL=0.01
R1104
6.8p
C1143
C1145
0.1u
C1144
33p
R1103
820
IN
1
OUT
4
G1
2
G2
3
G3
5
FL1109
L114
3
82
n
2
1
DNI
L114
0
C1148 100p
GND3
VD
D
VCTR
L
RFIN
RFOUT2
GND1
RFOUT1
GND2
SFMG2B0D001
FL1108
4
5
3
6
2
7
1
8
GNSS_ELNA_EN
GNSS_IN_N
GNSS_IN_P
( DGMS Guide )
MC-C00002-14 : ESD Protection Circuit
ANT3 GNSS
NEAR TO WTR
ANT3
100p
L1145
L1153
DNI
TP1
TP2
TP3
3.9.2 Checking GPS RF Signal path