Audio Trouble - LG E900 Service Manual

4.13 Audio trouble

4.13.1 Receiver path
Voice Receiver path as below :
QSD8650 Ear1_ON/OP
Start
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Hear the tone
to the receiver?
NO
Change the Receiver
NO
The sine wave appear
At TP1?
YES
The sine wave appear
at TP2?
YES
Can you hear the tone?
YES
END
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Only for training and service purposes
Sub system Input(TP1)
YES
YES
NO
NO
SPK_RCV +/- TP2 SPEAKER
END
END
Change the Main Board
Change the Main Board
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4. TROUBLE SHOOTING
LGE Internal Use Only