LG GT540 Service Manual page 122

4.12.3. Loud speaker path (voice speaker phone, Multimedia play)
Loud speaker path as below:
MSM7200A LINE_OP,ON -> Audio subsystem (WM9093) Main to SUB_PCB -> Speaker PAD
Connect the phone to network
Equipment and setup call setup
1KHz tone out set phone with speaker
phone mode or Play the multimedia
The sine wave appear at
TP1(C520), TP2(C521)?
The sine wave appear at
Can you hear the tone?
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Only for training and service purposes
START
contents
Yes
pads of spaker?
Yes
Yes
END
No
Change the Main board
No
Check the Audio subsystem &
SUB_PCB Con. or Change SUB_PCB
No
Check the Speaker Module
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4. Trouble Shooting
LGE Internal Use Only