Audio Receiver Path - LG TU550 Service Manual

4.15 Audio Receiver Path

MSM6275 EAR1ON/EAR1OP → CN602 → CN1 → 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
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Only for training and service purposes
Start
NO
PIN33,PIN34, CN1?
NO
PIN33,PIN34,CN602
NO
4. TROUBLE SHOOTING
YES
END
YES
Change receiver
YES
Check LCD FPCB.
Check main/upper connector.
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LGE Internal Use Only