LG -E435 Service Manual page 92

4.19.3 Speaker/Speaker Phone path
MSM7225A-0-AB HPH_R, HPH_L -> C4062, C4042(TP3) -> U4001 (PM8029 : PMIC) -> FB4001, FB4000 (TP2) -> CN7000
(TP1) (SPK Pad)
Connect the phone to network
equipment and set-up call.
Can you hear the 1KHz TONE?
Change the U2000 (MSM7225A) or
LGE Internal Use Only
START
Set-up 1KHz tone out.
No
The Sine wave appears at
CN7000 (TP1)
No
The Sine wave appears at
FB4001, FB4000(TP2)?
No
The Sine wave appears at
C4062, C4042(TP3)?
No
Change the main PCB
Yes
END
Yes
Re-contact or Change the SPK/RCV module
Yes
Change the SPK/RCV module
Yes
Change the U4000 (PMIC)
- 92 - Copyright © 2013 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
Only for training and service purposes