LG LG-P350 - Audio Trouble

4. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
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4.13 Audio Trouble
4.13.1. Receiver. path
Voice Receiver path as below:
MSM7227 RCV_N / RCV_P Æ TP1(R607), TP2(R608) ÆU600 (Audio Subsystem) ÆTP3( FB601), TP4(FB602) Æ
SPK/RCV Pad.
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Change the Receiver
The Sine wave appear at
TP1(R607) and TP2(R608)?
No
Yes
The Sine wave appear at
TP3(FB601), TP4(FB602)?
START
END
Re-solder at TP1 and TP2
or Change the Main board
No
Yes
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Change the U600
Hear the tone to the receiver?
END
Yes