LG -E435 Service Manual page 96

4.19.5 Headset microphone
- MIC Signal : 3.5 pi Headset (CN7001) -> FB7004(TP3) -> J_MIC of U7000 -> C2008(TP4) MIC2P of MSM7225A-0-AB
- MIC Bias : HSED_BIAS1 of U4001 -> R7012(TP2) -> Headset MIC
- HS Detect IC Bias: VBAT & VREG_MSME_1.8V -> C7024(TP1)
Make a some sound or voice to MIC
LGE Internal Use Only
START
Make a call
C7024(TP1) is about 1.8V &
R7012(TP2) is about 1.8V?
Yes
Some sound signal appears at
FB7004 (TP3)?
Yes
Some sound signal appears at
C2008 (TP4)?
Yes
END
No
Change the U4001 (PM8029) or
Change the Main PCB
No
Change the Headset or Re-solder/
Change the CN7001
No
Change the U2001 (MSM7225A-0-AB)
or Change the Main PCB
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4. TROUBLE SHOOTING
Only for training and service purposes