Audio Troble - LG -E510 Service Manual

4.18 Audio Troble

4.18.1 Receiver Path
MSM77T EAR1_OP, EAR1_ON → RCV_P, RCV_N → C511, C514 → R509, R510(TP3) →
IC500(WM9093ECS-R : Audio Subsystem) → FB500, FB501(TP) → CN70 ◊ CN101(FPCB conn.) →
CN100(TP1)(SPK solder pad)
Connect the phone to network
LGE Internal Use Only
START
equipment and setup call.
Setup 1KHz tone out.
Can you hear the tone?
No
The sine wave appears at
CN100(in FPCB)(TP1)
No
The sine wave appears at
FB500, FB51(TP)?
No
The sine wave appears at
R509, R510(TP3)?
No
Change the MSM77T or
Change the main PCB
Yes
END
Yes
Re-Salder speaker or Change the speaker
Yes
Change the speaker carrier
Yes
Change the IC500
- 1 - Copyright © 011 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
Only for training and service purposes