Audio Trouble - LG GW620 Servise Manual

4.13. Audio trouble

4.13.1. Receiver path
Voice Receiver path as below:
MSM7200A Ear_ON/Ear_OP
Connect the phone to network
Hear the tone to the receiver?
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Only for training and service purposes
IC1 (MAX9877AEWP_TG45)
Start
Equipment and setup call
Setup 1KHz tone out
NO
Change the SPK Module
The sine wave appear
at TP1, TP2?
YES
The sine wave appear
at Speaker Solder pads?
Can you hear the tone?
YES
END
Main to LCD_FPCB
YES
NO
Change the Main board
Check the IC1&FPCB Con.
NO
Or Change LCD_FPCB
Or Change SPK Module.
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4. TROUBLE SHOOTING
Speaker
END
LGE Internal Use Only