LG KM710 Service Manual - Page 85
MIC Trouble
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4. Trouble Shooting z MIC Trouble START Voltage across C628 or L602 is about 2.5V? NO MICBIAS Voltage of U102 is about 2.5V? NO Replace U102 YES Re-solder R100 & L100 Check the signal level at each side of MIC600. Is it a few tens mVAC? YES Check the soldering of C630-C638,L603,L604 NO Replace MIC600 NO Replace U102 change the Main Board END LGE Internal Use Only - 86 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes
z
MIC Trouble
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4. Trouble Shooting
- 86 -
YES
NO
Voltage across C628
or L602 is about
2.5V?
change the Main Boar
d
Check the signal
level at each side of MIC600.
Is it a few tens mVAC
?
START
MICBIAS
Voltage of
U102 is about 2.5V
?
Replac
e U102
NO
Replace MIC600
N
O
YES
Replac
e U102
NO
Check the soldering of
C630-C638,L603,L
604
END
Re-solder R100 & L100