LG -P768 Service Manual page 79

4.11.2 Receiver troubleshooting
Receiver control signals are generated by OMAP4430 (U501) and Power is supplied byTWL6040(U803).
Check the receiver sound
And reconnect receiver
Is receiver sound OK?
Change theTWL6040(U803)
Is speaker sound OK?
Change the mainboard
LGE Internal Use Only
START
(loop back mode).
on main-board.
TP1
No
Change receiver
ok? (TP2)
No
No
Yes
END
Yes
END
Yes
END
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4. TROUBLE SHOOTING
Only for training and service purposes