Main Microphone - LG L705i Service Manual

4. TROUBLE SHOOTING

4.17 Main microphone

MIC300 → C300,C301 → MIC1P, MIC1N(MSM6280)
Start
Make a call
MICBIAS(C303 or C305)
is 1.8V ?
Make sound to MIC
Sine wave appears at
C300,C301 ?
Change the Main board
SP0204LE5-PB
SUMY0010602
G3
PWR
G2
G1
OUT
MIC300
LGE Internal Use Only
NO
YES
YES
NO
YES
NO
5
4
C300
3
2
1
C301
C302 C304
NA 33p
- 116 -
Change main board
Change the MIC
YES
Work well?
MIC
R300
0
0.1u
MIC1N
MIC1P
0.1u
C303 C305
10u 1u
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
END
MICBIAS