![LG LG-E400 Скачать руководство пользователя страница 113](http://html.mh-extra.com/html/lg/lg-e400/lg-e400_service-manual_220910113.webp)
4. TROUBLE SHOOTING
- 113 -
Copyright © 01 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4.18 Audio Troble
4.18.1 Receiver Path
MSM75A EAR1_OP, EAR1_ON
→
RCV_P, RCV_N
→
R70, R703 (
TP3
)
→
M700 (TPA055D3: Audio Subsystem)
→
FB705, FB706 (
TP2
)
→
CN700 (
TP1
) (A 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/RCV
module
No
Change the SPK/RCV module
Change the M700 (Audio Subsystem)
Yes
Change the U00 (MSM75A) or
Change the main PCB
Can you hear the 1KHz TONE?
The sine wave appears at
CN700 (TP1) ?
The sine wave appears at
FB705, FB706 (TP)?
The sine wave appears at
R70, R703(TP3)?