Audio Trouble - LG -E730 Service Manual

4.18 Audio trouble

4.18.1 Speaker trouble
Speaker control signals are generated by QTR800 (U1001), amplified by WM9093 (M800), and Power is supplied by
Battery (VBAT).
Change the speaker module
LGE Internal Use Only
START
Reconnect the Touch FPCB
and check the speaker sound
Spker sound is OK?
No
Yes
Check the waveform of TP1
Waveform is OK?
No
Change the Touch FPCB
Speaker sounds OK?
No
Check the waveform of TP
Waveform is OK?
Change the Audio codec IC
Speaker sound OK
END
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4. TROUBLE SHOOTING
Yes
END
Yes
END
Yes
Change the Main PCB
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