LG LG-E730 - Page 152

4. TROUBLE SHOOTING
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4.18.4 SUB MIC trouble
Sub MIC control signals and power are generated by QTR8200 (U1001).
Reconnect the Earjack FPCB
and check the Sub MIC
Speaker phone call is OK?
No
END
Yes
START
Check the TP1
Bias range 1.8V~2.2V
OK?
No
Change the Earjack FPCB
Speaker phone call is OK
END