Receiver Path - LG CU405 Service Manual

4. TROUBLE SHOOTING

4.14 Receiver Path

MSM6280 EAR1ON/EAR1OP → CN500 → CN102 → Receiver
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Can you hear the tone?
The sine wave appears at
The sine wave appears at
Change the Main board
LGE Internal Use Only
Start
NO
PIN1,PIN2, CN500?
NO
PIN1,PIN2,CN500
NO
YES
END
YES
Change receiver
YES
Check LCD FPCB.
Check main/upper connector.
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