LG D686 Service Manual page 87

3.8.3 Receiver
Receiver control signals are generate by MT6575(U201), Receiver(CN501)
Yes
LGE Internal Use Only
START
Check the Receiver soundand
check receiver wire.
Hear the sound to the Receiver?
No
Receiver Contact is OK?
Yes
Change Receiver Module.
Can you hear a sound?
No
Check main board part FB505,FB506
No
Change Main Board
END
Re-assemble the Receiver
No
Yes
Yes
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3. TROUBLE SHOOTING
Only for training and service purposes