LG gd350 Service Manual page 68

TEST POINT
CIRCUIT
A N T 3 0 2
A N T 3 0 0
R 3 0 2
V L O G C I
R 3 0 3
T X _ R A M P
R 3 0 4
T X _ E N
R 3 0 5
B S 1
C 3 2 9
R 3 0 6
B S 2
D I N
C 3 2 7
1 0 0 p
C 3 0 8
1 2 p
.
L 3 0 6
1 0 0 n
P T 3 0 0
R F _ T E M P
1 0 K
R 3 1 4
1 0 K
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Only for training and service purposes
TP1
TP5
TP4
.
. .
1 1 0
1 K
.
1 1 0
1 1 0
1 1 0
C 3 0 0 C 3 0 1 C 3 0 2 C 3 1 9 C 3 2 0
1 n 1 n 1 n 3 9 p 1 n
3 3
P G N D 3
3 2
P G N D 2
3 1
P G N D 1
1 0
G N D 5
1 1
R X 1
1 2
R X 2
1 3
R X 3
1 4
R X 4
1 5
G N D 6
1 6
G N D 7
3 6
P G N D 6
3 5
P G N D 5
3 4
P G N D 4
1 8 4 2 5 . M H z 7 , 5
C _ G N D 2
3
C _ G N D 1
2
N I P U T 2
4
N I P U T 1
1
F L 3 0 1
8 8 1 5 . M H z 2 , 5 M
C _ G N D 2
3
C _ G N D 1
2
N I P U T 2
4
N I P U T 1
1
Figure 4.2.4
V B
1
G N D 1
3 0
V B A T T
2 9
D C S _ P C S _ N I
2 8
G N D 1 7
2 7
G S M _ N I
2 6
G N D 1 6
2 5
G N D 1 5
M H z
C _ G N D 4
1 0
C _ G N D 3
5
G N D 1
6
G N D 2
7
O U T P U T 1
8
O U T P U T 2
9
70/140 70/140
H z
C _ G N D 4
1 0
C _ G N D 3
5
G N D 1
6
F L 3 0 0
G N D 2
7
O U T P U T 1
- 69 -
8
O U T P U T 2
9
4. TROUBLE SHOOTING
4. TROUBLE SHOOTING
TP2
TP3
BS1
BS2
TX EN
VLOGIC
CONTROL LOGIC
EGSM Rx
A T
C 3 0 4 C 3 0 3 C 3 3 0 C 3 3 1
3 3 p 1 0 n 4 7 . u 4 7 . u
VLOGIC
Tx_EN
D
1
G
R 3 0 9
BS1
C 3 0 6
1 p
BS2
L 3 0 3
1 5 . n
R X 3 4 X
L 3 1 1
L 3 1 3
D I N
3 9 . n
R X 3 4
R X 1 2 X
L 3 1 4
1 5 n
R X 1 2
C S _ P C S _ O U T
S M _ O U T
LGE Internal Use Only