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4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.13.5 Microphone for headset
MIC for Head_Set path as below:
Insert Headset
→
EAR_SENSE_N(CN501 pin8) go 0V
→
MSM6280 sense Head_Set insertion
→
MIC
signal
→
U405 (Cam/ ear mic Switch)
→
C421
→
U400 (audio codec)
→
C426
→
L200
→
C201
→
MSM6280.
Start
EAR_SENSE_N is 0V?
END
Make a call
Change th e Main b'd
Change th e Main b'd
MIC_PWR (C540) is 2.7V ?
YES
YES
NO
NO
NO
Try chang e the h ead set
Can you scoping some
sound signal at C459 ?
Check t he FB500, Headset
YES
YES
make some sound or
voice to MIC
Work well?
END
YES
Can you s coping som e
sound signal at C426 ?
Check t he U400 or
Change th e Main B'd
NO
NO
YES
Can you scoping some
sound signal at C421 ?
Change th e Main b'd
NO
YES