Audio Trouble - LG GT540 Service Manual

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
Hear the tone to the receiver?
Change the SPK Module
The sine wave appear at
TP1(R513), TP2(R514)?
The sine wave appear at
Speaker Solder pads?
Can you hear the tone?
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Only for training and service purposes
START
1KHz tone out
No
Yes
Yes
END
Yes
END
No
Change the Main board
Check the Audio subsystem &
No
SUB_PCB Con.
or Change SUB_PCB
or Change SPK Madule
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4. Trouble Shooting
LGE Internal Use Only