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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5. TROUBLE SHOOTING
5.13.6. Checking FEM & Mobile SW
EGSM/GSM850
DCS/PCS
FE1
ON
OFF
FE2
ON
ON
SW401
FL401
TP1
TP2
TP5
TP3_R400 (FE1)
TP4_R405 (FE2)
FL400
SW400
TP1
TP2
Mobile SW & FEM Circuit Diagram
Figure 28. Mobile SW & FEM Circuit
Checking Points
Figure 29 Mobile SW & FEM
Table 5. FEM TX Control Logic
TP3
TP4
TP5
TP1
TP2
P
5.
1
5
1
4
C
4
1
4
CP
5.
1
C408
UFL-R-SMT10
SW401
G1
ANT
G2
R400
100R
P
2.
2
0
0
4
C
2V85_VRF
C403
1V5_VRF
FL400
LMSP43QA-538
24
23
2
2
7
1
8
1
5
1
6
1
4
1
8
3
1
7
2
1
0
1
6
9
5
1
2
4
3
0
2
9
1
2
1
11
ANT
1
X
R
_
0
5
8
M
S
G
2
X
R
_
0
5
8
M
S
G
1
C
V
2
C
V
1
X
R
_
0
0
9
M
S
G
2
X
R
_
0
0
9
M
S
G
D
D
V
1
X
R
_
0
0
8
1
M
S
G
1
D
N
G
2
X
R
_
0
0
8
1
M
S
G
2
D
N
G
3
D
N
G
1
X
R
_
0
0
9
1
M
S
G
4
D
N
G
2
X
R
_
0
0
9
1
M
S
G
5
D
N
G
6
D
N
G
X
T
_
0
0
9
1
_
0
0
8
1
M
S
G
7
D
N
G
X
T
_
0
0
9
_
0
5
8
M
S
G
8
D
N
G
NC1
NC2
P
2.
2
9
0
4
C
1
1
4
CP
2.
2
C412
100P
100P
C413
27n
C424
1n
C416
P
2.
2
7
1
4
C
2V85_VRF
100P
C420
R405
100R
2
2
4
CP
2.
2
C423
DNI
5.6p
L404
5
2
4
CP
2.
2
33n
C446
L405
3.9n
L406
100NH
DNI
C437
C435
1.5p
RF-800
SW400
G2
ANT
RF
G1
FE1
FE2
GSM900
GSM850
PCS1900
DCS1800
TP1
TP2
TP3
TP4
TP5