LG D337 - Page 92

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3.12.5. Sub Mic Trouble Shooting
It’s operating Speakerphone call
Check Mic hole & rubber to mak
the voice signal?
Check parts about Mic Bias
Mic works well?
Reconnect or change Mic Voice signal OK?
Change MT6323(U4100).
Mic works well?
START
END
Check the Mic signal by test mode(SPK
Phone)
Change Main Board
No
No
Yes
Yes
Yes
Yes
No
No