LG P705 - Page 96

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