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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
FEM & Mobile SW ok
FEM
Check Control Signal
TP3, TP4 are working
Mobile SW
Check SW400 between TP1 and
TP2 Is short
Replace SW400
Check U401
YES
Yes
NO
No
CHECKING FLOW
Fig4-12. SW & FEM schematic
Fig4-11. SW & FEM placement
FL400
SW400
TP3
TP4
U401
TP1
TP2
4.2.1.3 Mobile Switch & FEM Circuit
E
1
0
0
-
9
6
3
0
2
1
0
4
W
S
T
N
A
1
G
2
G
3
G
p
3
3
6
1
4
C
I
N
D
2
2
4
C
4
2
4
C
p
5
1
3
B
R
0
0
6
2
-
0
3
4
8
M
M
0
0
4
W
S
GND1
3
GND2
4
5
GND3
6
GND4
IN
1
2
OUT
5
1
4
C
p
0
0
1
1
2
4
C
I
N
D
3
2
4
C
p
6
5
2
2
9
D
N
G
3
2
5
1
T
U
O
_
X
R
0
0
8
1
M
S
G
6
2
T
U
O
_
X
R
0
0
8
1
M
S
G
X
T
_
0
0
9
1
_
0
0
8
1
M
S
G
5
1
1
T
U
O
_
X
R
0
0
9
1
M
S
G
7
8
2
T
U
O
_
X
R
0
0
9
1
M
S
G
1
1
T
U
O
_
X
R
0
5
8
M
S
G
2
2
T
U
O
_
X
R
0
5
8
M
S
G
X
T
_
0
0
9
_
0
5
8
M
S
G
7
1
1
T
U
O
_
X
R
0
0
9
M
S
G
3
4
2
T
U
O
_
X
R
0
0
9
M
S
G
C
N
1
2
9
1
1
C
V
2
C
V
0
2
0
0
4
L
F
B
F
5
8
0
C
-
S
H
S
L
1
1
T
N
A
1
D
N
G
9
4
2
0
1
D
N
G
2
D
N
G
0
1
2
1
3
D
N
G
4
D
N
G
3
1
5
D
N
G
4
1
6
D
N
G
6
1
8
1
7
D
N
G
8
D
N
G
T
P
1
T
P2
T
P3
T
P4