LG LG-E730 - Receiver Trouble

4. TROUBLE SHOOTING
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4. 18.2 Receiver trouble
Receiver control signals and power are generated by QTR8200 (U1001).
Reconnect the Earjack FPCB
and check the speaker sound
Spker sound is OK?
No
END
Yes
START
No
Change the Main PCB
Change the receiver
Yes
Check the waveform of TP1
Waveform is OK?
Check the waveform of TP2
Waveform is OK?
Change the USB FPCB
Yes
Speaker sound OK
END