Earphone Trouble - LG B2050 Service Manual

4 . TROUBLE SHOOTING

4.9 Earphone Trouble

TEST POINT
CIRCUIT DIAGRAM
V 2 _ 8 E V T X
2 U 5 0
2 C 7 2
N A L 4 S 8 6 M 4 2 R
1 u 0
1
+ V N 2 O
2
R D A O I S _ K P R _
N 1 O O C 2 M
2 R 2 3
3
O C 1 M I 2 N
A N
4
R D A O I S _ L E
I 1 N N 2 C
5
H A E S D T E S _ K P P _
N 1 C G D N
C 2 0 3
H E A D S E T _ M C I _ N
C
H E A D S E T _ S
H E A D S
J A C
H E A D S E T _ S
R
H A E S D T E S _ K P O _ T U P _
R D A O I S _ K P L _
0 1
9
H A E S D T E S _ K P O _ T U N _
8
2 R 4 3
A N
7
H A E S D T E S _ K P N _
2 V 5 _ J A
6
R 2 0 1
2 2 . K
0 1 . u
R 2 0 5 2 0 K
C 2 0 5 C 2
2 0 4
R 2 0 6
N A 3 3 u
2 0 K 3 9 p
1 ( 6 0 ) 8
C 2 1 2 1 0 u
P K _ O U T _ P
E T _ M C I _ P
K _ D E T E C T
1 ( 6 0 ) 8
C 2 1 5 1 0 u
P K _ O U T _ N
A I D O _ A N T
C K 2 V 8 _ V E X T 2 V 8 _ V E X T
R 2 0 2
1 M
U 2 0 1
M A X 9 0 7
R 2 0 4
5
V N I -
4
V C C
3 3 . K
0 6
V N I + 3 O
G N D
2
R 2 0 9
2 2 0 K
L 2 0 0 2 2 . u H
R 2 1 1 4 7 .
R 2 1 2 4 7 .
R 2 1 3 0
L 2 0 1 2 2 . u H
R 2 1 5 4 7 .
C 2 1 7 R 2 1 6
3 9 p 1 M
- 74 -
2 V 8 _ V E X T
U
1
G
2
V
C 2 0 7
1 0 u
H E A D S E
C 2 0 0
3 9 p
5 E X K T -
1
H O
U T
C 2 1 6
C 2 1 8 V A 2 0 2 V A 2 0 3 V
3 9 p
3 9 p
J200
U205
U200
U201
2 V 5 _ J A C K
2 0 0 N C P 5 6 3 Q 2 5 T 1
4
N D N C
3
n i V O U T
C 2 0 8
1 0 u
T J A C K
O K _ D E T E C T
J 2 0 0
A 2 0 4
L 2 0 2
C 2 1 9 2 7 0 n H
1 0 p
1 6 0 8
4 7 . u H
C L O S E T O H E A D S E T J A C K