LG -E450 Service Manual page 143

4.8.5 2nd Mic
2nd Mic located on Main PCB Top Side..
It's operating handset voice call and speakerphone
LGE Internal Use Only
START
Check the Mic signal by test mode
(2nd loop back or Camcorder test)
Check Mic hole & rubber to
make the voice signal?
No
Check parts about Mic Bias
Mic works well?
No
Change Mic
(MIC400)
Mic works well?
No
Change MT6575(U200).
Mic works well?
No
Change Main Board
END
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4. TROUBLE SHOOTING
Yes
Yes
Yes
Yes
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