LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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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
Start
Connect the phone to netw ork
Equipm ent a nd setup call
Setup 1KHz tone out
Can you hea r the tone?
YES
END
Check c onnector pin
or chang e the Main F PCB
YES
Check receiver soldered well.
Change t he Receiver
Hear the tone to the receiver?
NO
END
Check U401 soldered well
Hear the tone to the receiver?
NO
NO
Change a main board