Audio Trouble Shooting - LG L601i Service Manual

4.15 Audio Trouble Shooting

4.15.1 Receiver Path
Voice Receiver path as below:
MSM6250A Ear1ON/Ear1OP -> U605(Speaker/receiver switch) -> CN501(b'd to b'd connector)
-> MAIN FPCB(b'd to b'd connector) -> Speaker
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Hear the tone to the receiver
The sine wave appear at
The sine wave appear at
Speaker soldering point?
Change the speaker
Can you hear the tone?
Start
NO
NO
R525, R526?
YES
NO
YES
YES
END
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4. TROUBLE SHOOTING
Change the Main board
Check connector pin and
Speaker soldering point.
Or Change the LCD FPCB