LG D686 Service Manual page 84

3.8.2 Speaker
It's trouble shooting guide for no sound case.
Speaker control signals are generate by MT6577(U201), TPA2015(U501,U502)If low level volume or breaking the sound,
change speaker module
LGE Internal Use Only
Check the speaker.
And reconnect Speaker module
Yes
Hear the sound to the Speaker?
Change Speaker Module?
Check Lower FPCB and Main PCB.
(C508,C507,C506,C505,
FB504,FB502,FB501,FB503,
L1001~L1004)Speaker Sound OK?
Change Main Board
START
No
No
No
END
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3. TROUBLE SHOOTING
Yes
Yes
Only for training and service purposes