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LGE Internal Use Only
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
LG Electronics
74/115
LGE Property
START
Replace MIC
Yes
No
No
Check microphone sound
hole
Replace PCB
Yes
No
MIC Bias
ON?(2.5V) When
Call? (L303)
Assemble
MIC work
properly?
Check mic. Bias line
MIC Siganl OK?
(L301,L302)