LG -P715 Service Manual page 108

4.13.6 Headset microphone
MIC Signal: 3.5 pi Headset (J6001) -> R6038 (TP3) MIC of FSA8008UMX & C2016 (TP4) MIC2P of MSM8225
MIC Bias : VREG_MSME_1.8V -> C6016 (TP1)
HS Detect IC Bias: VREG_P3_2.85V -> C6014 (TP2)
TP1 is about 1.8V?
Make some sound or voice to MIC
Some sound signal appears at
Some sound signal appears at(TP3)?
LGE Internal Use Only
START
Make a call
Yes
FB100(TP4)
Yes
Yes
END
No
TP2 is about 2.85V?
Change the U6001(Max14579E) or
Change the Main PCB
No
Change the Headset or Re-solder
change the CN1000 or
Change the Main PCB
No
Change the U200
(MSM7225A or Change the Main PCB)
- 108 - Copyright © 2013 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
No
Only for training and service purposes