LG LG-E400 - Headset Path

4. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
4.18.2 Headset path
MSM7225A HPH_R, HPH_L → C714, C715(TP2) → M700 (TPA2055D3: Audio Subsystem) →
R710, R711 → FB702, FB703(TP1) → CN701 ( 3.5pi Ear-jack )
Yes
No
START
END
Connect the phone to network
equipment and set-up call.
Set-up 1KHz tone out.
No
Yes
Re-Solder & Change CN701 or change
the main PCB
No
Change the M700 (Audio Subsystem)
Yes
Change the U200 (MSM7225A) or
Change the main PCB
Can you hear the 1KHz TONE?
The sine wave appears at
FB702, FB703(TP1)?
The sine wave appears at
C714, C715(TP2)?