4. TROUBLE SHOOTING
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4.12. 5 Ear-MIC troubleshooting
Ear MIC control signals are generated by MAX98089(U7000), and Power is supplied by Battery (VBAT).
Check the Ear-jack, And reconnect the Upper FPCB.
Yes
No
START
Ear Sound is OK?
Change The Upper FPCB.
END
END
No
Ear MIC is OK?
No
Check the
waveform of TP1
waveform is OK?
No
Check the
EJ_MICBIAS(TP2).
Voltage is 2.2V?
Change The Code IC or Main PCB
Sound or MIC is OK?
END
Change The Upper FPCB.
Yes
Yes
Yes
Yes