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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
Voice path for Head_Set as below:
MSM7227 HPH_R,HPH_L
Æ
C507,C508
Æ
IC500(Audio Subsystem)
Æ
FB502,FB503
Æ
3.5pi Ear-jack
4. Trouble Shooting
(BB)
4.13.2 Headset path (Voice & Multimedia play)
Start
The sine wave
appear at TP1?
Change the Main board
NO
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
And insert head_Set
YES
Can you hear the tone
or sound?
NO
YES
END
YES
Check the TP5
or change SUB PCB
The sine wave appear at
TP2,TP3?
Check the TP4
NO
YES
Or Play Multimedia Contents
And insert head_set
(Or Some Sound Signal)
135 P
1u
12
5
C
22n
C509
22n
C510
220n
C508
220n
C507
IC500
D4
C3
B3
B2
C2
C1
D2
D1
A5
A4
5
C
1
B
3
A
S
S
V
D
D
V
D
D
V
P
C1N
C1P
INA2
INA1
INB2
INB1
BIAS
SDA
SCL
1u
10
5
C
LINE_ON
LINE_OP
HPH_L
HPH_R
D505
1800
FB503
1800
FB504
10K
10
5
R
22p
C514
D501
1800
FB502
J500
C8
100p
47
R508
D502
100n
L500
47p
C517
47p
C518
D503
FM_ANT
EAR_SENSE
EAR_MICP
EAR_R
EAR_L
TP1
TP4
TP2
TP
TP5
Audio Subsystem