LG -D605 Service Manual page 128

3.17.4 Sub MIC Troubleshooting
Sub MIC signal is generate by MEMS MIC on Main Board
LGE Internal Use Only
START
Check the MIC signal
(loop back mode).
Check the MIC hole to make clear the
voice signal path. Is voice signal OK??
No
Change the Sub MIC (MIC7000).
Is voice signal OK??
No
Change the WCD9304 (U7000)
Is the voice signal OK??
No
Change Main Board
Yes
END
Yes
END
Yes
END
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3. TROUBLE SHOOTING
Only for training and service purposes