LG LG-E410 - Page 100

4. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
4.18.5 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)
No
START
Make a call
Yes
No
Make a some sound or voice to MIC
Yes
C7024(TP1) is about 1.8V &
R7012(TP2) is about 1.8V?
Some sound signal appears at
FB7004 (TP3)?
Some sound signal appears at
C2008 (TP4)?
Yes
END
No
Change the U2001 (MSM7225A-0-AB)
or Change the Main PCB
Change the U4001 (PM8029) or
Change the Main PCB
Change the Headset or Re-solder/
Change the CN7001