LG GT810h Service Manual page 122

4.10.5 Microphone for headset
MIC for Head_Set path as below:
→
Insert Headset EAR_SENSE_N(pin5) : high(MSM7201A GPIO29)
(HS_MIC_BIAS_EN) : High
sound signal at C214,C219?
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Only for training and service purposes
→
MIC_BIAS LDO Output
Start
Inser t Headset
& Make a call
EAR_SENSE is high?
YES
MIC_BIAS(R413) is 1 .8V ?
YES
make some sound or
voice to MIC
Can you s coping some
sound signal at C221?
YES
Can you s coping some
YES
Work well?
4. TROUBLE SHOOTING
→
→ →
MIC signal
NO
Change the Main b'd
NO
Change the Main b'd
NO
Chang e the MIC
Check t he U201 or
NO
Change the Main B'd
YES
END
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MSM7201AGPIO97
MSM7201A
LGE Internal Use Only