- 151 -
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
4.13.5. Microphone for headset
MIC for Head_Set path as below:
Insert Headset Æ Interrupt which are the signal of Headset detecting arise in EAR_SENSE
ÆMIC BIAS LDO
U21’s R12(RES) : 1.6V~1.8V(MIC BIAS) Æ MIC signal Æ FB1 Æ
-> C90 -> MSM7200A
Insert Headset
& Make a call
Change the Main b’d
TP1 is 1.6~1.8V ?
YES
NO
Can you scoping some
sound signal at TP2?
YES
make some sound or
voice to MIC
Work well?
END
YES
NO
YES
Start
Change the Main b’d
To Next Page
Loading...
