Fm Radio Trouble - LG GM200 Service Manual

4.18 FM Radio Trouble

TEST POINT
Figure 4.18-1
CIRCUIT
MATCHING
CIRCUIT
C 4 0 3 1 0 0
F M _ A N T _ 1
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
MATCHING
CIRCUIT
TP1
V B A T
R P 1 0
4
3
F M _ L N A _ E N
C 3 0 5
E U S Y
1 u
U 3
1
N
2
C 3 1 5 1 0 0 0 p
R
F M _ A N T
3
N
R 3 1 0
C
1 K
S N G F 0 0 3 2 2 0 1 > - S N G F 0 0 3 1 4 0 2
0 ( 8 1 2 2 ) 0
S N G F 0 0 3 1 4 0 2
A C S 2 4 5 0 F B A K F 7
F L 4 0 1
C 4 0 1
N C 2 F E E D N I O U T
N C 1 3 9 . p G N D 1 G N D 2
R 4 0 2 L 4 0 1
L F B 2 1 2 G 4 5 S G 8 A 1 6 6
A N T 4 0 1
S F C Y 0 0 0 0 9 0 1
D I N 2 2 . n H
L 4 0 2
0 p
1 0 0 n H
C 4 0 4 C 4 0 5
TP2
F M _ R
4 7 p 4 7 p
F M _ L
2 6 M _ B T
B T _ 3 2 K
2 I S _ S C K
B T _ D B B _ C L K O N
2 I S _ I D
C 4 1 0
2 I S _ W S
D I N
B T _ N I T
W
B T _ W A K E U P
P
B T _ P C M _ T X
P
B T _ P C M _ R X
P C M
B T _ P C M _ S Y N C
P C
B T _ P C M _ C L K
B T _ R E S E T
4 K 2 8 1 D T - R F - U 3 0 1
1
V D D V O U T
2
C E _ N C G N D
0 3 5 5 6 0 1
C 3 0 6 C 3 0 7
2 2 . u 1 0 0 0 p
L 3 0 3
2 7 0 n H
0 2 M G A 6 - 8 5 T 6
7
P G N D
C 1
6
B A I S
C 3 1 7
F _ N I
5 1 0 0 0 p
R F _ O U T
C 2
4
N C 3
3 1 8 1 0 0 0 p
1 ( % ) 2 V 9 3 _ V E
R 4 0 1
1 5 0 K
H 2 F 7
R E S U A R T _ C T S _ N
F 1 C 9
R I F O P U A R T _ R T S _ N
C 4 0 2 1 0 p
G 1 J 9
R I F O N U A R T _ R X D
K 1 0
U A R T _ T X D
D 4
N C
D 1 J 6
F M R F _ N I P T M 3
C 1 F 6
F M R F _ N I N T M 2
L 4 0 3 5 6 n H
A 3 J 7
F M V C O _ L P T M 1
A 2 K 7
F M V C O _ L N T M 0
A 1
F M _ C V A R
C 4 0 6 0 1 . u K 6 D 5
A U I D O R V R E G _ C T L
C 4 0 7 0 1 . u K 5 B 5
A U I D O L V R E G _ B T
J 5 A 5
A U I D O G N D V R E G F M _ D A C
A 6
V D D R 5 V
K 2 B 6
X T A L P V D D R 3 V
K 3 K 8
X T A L N V D D O 1 8 _ 1
C 4 0 9 0 1 . u B 4 A 8
L P O N I V D D O 1 8 _ 2
F 9
V D D O 1 8 _ 3
4 I 0 1
D 1 0 G 5
G I P O 7 V D D C 1
B 8 D 9
G I P O 6 V D D C 2
G 6 U 4 0 1 G 7
G I P O 5 V D D C 3
4 I 0 2
E 6 A 7
G I P O 4 B C M 2 0 4 8 S B 0 V D D C 4
4 I 0 3
G 9 J 1 0
G I P O 3 V D D C 5
E U S Y 0 3 6 5 2 0 1
F 1 0 E 1
G I P O 2 V D D T F
B T _ N I T
H 9 E 2
G I P O 1 V D D R F
H 1 0 K 1
A K E U P
G I P O 0 V D D P L L
E 7 J 3
A _ G I P O 7 V D D X O
B 7 J 1
A _ G I P O 6 V D D L O
K 9 A 4
A _ G I P O 5 V D D F M 1
E 9 B 1
A _ G I P O 4 V D D F M 2
A 1 0 B 3
C M _ T X
A _ G I P O 3 V D D F M 3
C M _ R X B 1 0 J 4
A _ G I P O 2 V D D F M 4
C 1 0 K 4
_ S Y N C
A _ G I P O 1 V D D F M 5
M _ C L K B 9 A 9
A _ G I P O 0 V D D O 3 3 _ 1
E 1 0
V D D O 3 3 _ 2
B T _ R S T D 6 J 8
R S T _ N V D D O 3 3 _ 3
C 4 1 6 0 1 . u
C 4 1 7 C 4 1 8
0 1 . u 1 u
- 115 -
4. TROUBLE SHOOTING
Figure 4.18-2
TP1
F M _ A N T _ 1
X T
U A R T _ R T S
B T _ U A R T _ R T S
U A R T _ C T S
B T _ U A R T _ C T S
B T _ U _ T X
B T _ U A R T _ T X
B T _ U _ R X
B T _ U A R T _ R X
2 V 9 3 _ V E X T
V B A T
L D O _ E N
B T _ L D O _ E N
C 4 0 8
1 u
F B 4 0 1 C 4 1 1 C 4 1 2
H B 1 - M 1 0 0 5 6 - 0 1 J T
1 u 0 1 . u
S F B H 0 0 0 0 9 0 3
C 4 1 3 C 4 1 4 C 4 1 5
1 u 1 u 1 8 . p
LGE Internal Use Only
TP2