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4.10.5 Microphone for headset
MIC for Head_Set path as below:
Insert Headset
→
EAR_SENSE_N(pin5) : high(MSM7201A GPIO29)
→
MSM7201AGPIO97
(HS_MIC_BIAS_EN) : High
→
MIC_BIAS LDO Output
→
MIC signal
→
MSM7201A
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4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
EAR_SENSE is high?
Inser t Headset
& Make a call
Change the Main b'd
Change the Main b'd
MIC_BIAS(R413) is 1 .8V ?
YES
NO
NO
Can you s coping some
sound signal at C221?
Chang e the MIC
YES
YES
make some sound or
voice to MIC
Work well?
END
YES
Can you s coping some
sound signal at C214,C219?
Check t he U201 or
Change the Main B'd
NO
NO
YES
Start
Summary of Contents for CT815
Page 1: ...Date May 2009 Issue 1 0 Service Manual Model CT815 Service Manual CT815 Internal Use Only ...
Page 221: ...Note ...
Page 222: ...Note ...