LG GT540 - Audio Trouble

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Only for training and service purposes
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4. Trouble Shooting
4.12. Audio trouble
4.12.1. Receiver path
Voice Receiver path as below:
MSM7227 EAR1_ON/EAR1_OP->Audio subsystem (WM9093)->Main to SUB_PCB->Speaker
Connect the phone to network
Equipment and setup call setup
1KHz tone out
Hear the tone to the receiver?
No
END
END
Yes
The sine wave appear at
TP1(R513), TP2(R514)?
Change the Main board
START
Change the SPK Module
Yes
The sine wave appear at
Speaker Solder pads?
Check the Audio subsystem &
SUB_PCB Con.
or Change SUB_PCB
or Change SPK Madule
Can you hear the tone?
No
No
Yes