LG P705 Service Manual page 96

4.19.3 Speaker/Speaker Phone path
MSM7227A-1-AA LINE_OP, LINE_ON -> C711, C713(TP3) -> IC705 (TPA2055D3: Audio Subsystem) -> FB702, FB703(TP2)
-> CN803(TP1)(SPK pad)
Connect the phone to network
equipment and set-up call.
Can you hear the 1KHz TONE?
Change the U200 (MSM7227A-1-AA) or
LGE Internal Use Only
START
Set-up 1KHz tone out.
No
The Sine wave appears at
CN803 (TP1)
No
The Sine wave appears at
FB703(TP2)?
No
The Sine wave appears at
C711(TP3)?
No
Change the main PCB
Yes
END
Yes
Re-contact or change the SPK.
Yes
Re-contact or test the new lower FPCB.
(If It's OK, Change the FPCB)
Yes
Change the IC705(Audio subsystem)
- 96 - Copyright © 2012 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
Only for training and service purposes