LG LG-E730 - Audio Trouble

4. TROUBLE SHOOTING
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Only for training and service purposes
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4.18 Audio trouble
4.18.1 Speaker trouble
Speaker control signals are generated by QTR8200 (U1001), amplified by WM9093 (M800), and Power is supplied by
Battery (VBAT).
Reconnect the Touch FPCB
and check the speaker sound
Spker sound is OK?
No
END
Yes
START
No
Change the Touch FPCB
Speaker sounds OK?
Change the Audio codec IC
Change the speaker module
Yes
Check the waveform of TP1
Waveform is OK?
END
Yes
No
Check the waveform of TP2
Waveform is OK?
Change the Main PCB
Yes
Speaker sound OK
END