LG LG-P970 - Receiver Troubleshooting

4. TROUBLE SHOOTING
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4. 12.2 Receiver troubleshooting
Receiver control signals and power are generated by TWL5034 (U402).
Reconnect USB 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