Receiver Path - LG U250 Service Manual

4.16 Receiver Path

MSM6245 EAR1ON/EAR1OP → R421,R422 → Analog Switch(U401) → Receiver
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
The sine wave appears at
Change the Main board
Start
Can you hear the tone?
NO
The sine wave appears at
L401, L402?
NO
R421, R422?
NO
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4. TROUBLE SHOOTING
YES
END
YES
Change receiver
YES
Check the analog switch