Audio Trouble - LG KU950 Service Manual

4.17 Audio trouble

4.17.1. Receiver path
Voice Receiver path as below:
MSM6275A Ear1ON/Ear1OP → CN801(b'd to b'd connector for LCD Module) →
CN101(LCD b'd to b'd connector of LCD FPCB) → R100, R101 → Receiver
Connect the phone to network
Equipment and setup call
Can you hear the tone?
Start
Setup 1KHz tone out
Hear the tone to the receiver
NO
Change the Receiver
The sine wave appear at
#3, #4 pin of CN801
(or R100,R101)
YES
The sine wave appear at
Receiver line of LCD PCB?
NO
Check connector pin
or change the LCD PCB
YES
END
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4. TROUBLE SHOOTING
YES
END
NO
Change the Main board