Audio Trouble - LG KC910 Service Manual

4. TROUBLE SHOOTING

4.13 Audio trouble

4.13.1 Receiver path
Voice Receiver path as below:
MSM6280 Ear1ON/Ear1OP → R411/ R412 → U401(SPK/ RCV Switch) → FB402/ 403 →
CN601(Main to FPCB Connector) → Main FPCB → Receiver
Connect the phone to netw ork
Equipm ent a nd setup call
Setup 1KHz tone out
Hear the tone to the receiver?
Check receiver soldered well.
Change t he Receiver
Hear the tone to the receiver?
Check c onnector pin
or chang e the Main F PCB
Check U401 soldered well
Can you hea r the tone?
LGE Internal Use Only
Start
NO
YES
NO
NO
YES
END
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END
Change a main board
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