- 1 -
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
Voice Receiver path as below:
MSM7227 RCV_N / RCV_P
Æ
80PIN CONN
Æ
RCV pad
Start
Change the Main board
NO
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
YES
Can you hear the tone?
YES
END
YES
Change the Receiver
Hear the tone to the receiver?
NO
END
4. Trouble Shooting
(BB)
4.13 Audio trouble
4.13.1 Receiver path
The sine wave appear at
TP1
The sine wave appear
at TP2?
Check the 80pin Conn.
Or Sub PCB.
NO
133 P
Voice Receiver path as below:
MSM7227 RCV_N / RCV_P
Æ
80PIN CONN
Æ
RCV pad
Start
Change the Main board
NO
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
YES
Can you hear the tone?
YES
END
YES
Change the Receiver
Hear the tone to the receiver?
NO
END
4. Trouble Shooting
(BB)
4.13 Audio trouble
4.13.1 Receiver path
The sine wave appear at
TP1
The sine wave appear
at TP2?
Check the 80pin Conn.
Or Sub PCB.
NO
133 P
CN200
72
9
73
8
74
7
75
6
76
5
77
4
78
3
79
2
80
1
RCV_P
RCV_N
MIC_BIAS
SPK_P
SPK_N
MIC_P
MIC_VGND
22p
C402
CN400
2
1
22p
C411
RCV_P
RCV_N
TP1
TP2
Содержание GD88O
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