Audio Trouble Shooting - LG U8500 Service Manual

4. TROUBLE SHOOTING

4.18 Audio Trouble Shooting

4.18.1 Receiver Path
Voice Receiver path as below:
MSM6250 Ear1ON/Ear1OP -> R605,R606 -> CN600(b'd to b'd connector for LCD Module) -> LCD b'd
to b'd connector of LCD FPCB -> LCD module -> Receiver
Start
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Hear the tone to the receiver
NO
Change the Receiver
The sine wave appear at
R605,R606?
YES
The sine wave appear at
Receiver line of LCD FPCB?
NO
Check connector pin
or change the LCD FPCB
Can you hear the tone?
YES
END
YES
NO
Change the Main board
- 110 -
END