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5. Trouble shooting
5.7 Microphone trouble
Check Points
-Microphone hole
-MICBIAS & Signal come from
-Audio signal level of the Microphone
-Soldering of components
MIC_N
MIC_P
START
Check microphone sound
hole
Yes
Mic bias ON
(2.5V)when
call?( TP3,L302)
Yes
Check the signal
level at ( TP1,2)each
side of MIC300.
Yes
Replace Main PCB
LGE Internal Use Only
MIC
MIC
C321
39p
TP1
L304
C320
C319
100nH
22n
39p
TP2
L303
C318
100nH
22n
C317
39p
No
Check mic. Bias
No
microphone
- 78 -
MICBIAS
TP3
MIC300
1
P
2
G1
3
G2
4
O
SPU0409HE5H-PB
VA300
C322
10u
line
Replace
(MIC300)
Copyright © 2008 LG Electronics. Inc. All right reserved.
TP1
TP2
TP3
Only for training and service purposes
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Table of Contents
Troubleshooting
