Audio Trouble - LG -P350 Service Manual

4.13 Audio Trouble

4.13.1. Receiver. path
Voice Receiver path as below:
MSM7227 RCV_N / RCV_P
SPK/RCV Pad.
START
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Hear the tone to the receiver?
Yes
Change the Receiver
The Sine wave appear at
TP1(R607) and TP(R608)?
Yes
The Sine wave appear at
TP3(FB601), TP4(FB60)?
Yes
END
LGE Internal Use Only
TP1(R607), TP2(R608) U600 (Audio Subsystem)
No
Re-solder at TP1 and TP
or Change the Main board
No
END
Change the U600
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4. TROUBLE SHOOTING
TP3( FB601), TP4(FB602)
Only for training and service purposes