LG GM750 Service Manual page 129

4. TROUBLE SHOOTING
4.10.3. Loud speaker path (voice speaker phone, Multimedia play)
Loud speaker path as below:
MSM7200A Line_OP,ON
Start
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Set phone with speaker phone mode
or Play the multimedia contents
The sine wave appear
at C513, C514 ?
The sine wave appear at
pads of speaker?
Can you hear the tone?
LGE Internal Use Only
C513, C514 IC501 (Audio Subsystem)
A
A
NO
YES
NO
YES
NO
YES
END
S P
S P
A u d o i S U B S Y S Y
C 5 1 7
1 u
V R E G _ M S M P _ 2 6 . V
C 5 1 6
H P H _ R
C 5 1 5
H P H _ L
C 5 1 4
L N I E _ O N
C 5 1 3
L N I E _ O P
C 5 1 2
U I D O _ 2 I C _ S D A
U I D O _ 2 I C _ S C L
R 5 1 9 2 7
R C V _ P
R C V _ N
R 5 3 1 2 7
D e e l e t
c h a n g e d R e v 1 0 .
Change the Main board
Check IC501
Change the speaker
K R _ P
K R _ N
D 5 9 1 D 5 9 2
C 5 9 1 C
P R S B 6 8 . C P R S B 6 8 . C
3 3 p 3 3
- 130 - Copyright © 2009 LG Electronics. Inc. All right reserved.
speaker PAD
V R E G _ 5 V
E M
C 5 1 0 1 u
C 5 1 1 1 u
A 4
C 1 N
A 5
C 1 P
2 2 0 n D 1
N I A 2
2 2 0 n D 2
N I A 1
C I 5 0 1
C 1
1 8 n
N I B 2
M A X 9 8 7 7 A E W P _ T G 4 5
C 2
1 8 n
N I B 1
B 2
B A I S
1 u
B 3
S D A
C 3
S C L
D 4
R X N I +
B 4
R X N I -
d R e . v C
1 6 0 8
C N 5 0 1
1
L 5 9 9 6 8 n
2
L 5 9 8 6 8 n
1 6 0 8
5 9 2
p
Only for training and service purposes