LG LG-D855 - Speaker Trouble Shooting

3. TROUBLE SHOOTING
- 152 -
Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3.13.2 Speaker Trouble Shooting
It’s trouble shooting guide for no sound case.
Speaker control signals are generate by MSM8974(U2100), WCD9320(U6100)
Speak Boost_Amp (U6200)
START
Check the Speaker soundand check
Speaker wire.
End
Change Speaker.
Can you hear a sound?
2. Check
Main PCB part
(L6204,L6203) Speaker signal OK?
2. Check
Main PCB part (Speak Amp)
(FB6201,FB6202)
Speaker signal OK?
1. Speaker Pin is OK on the contact
point?
Change Main Board
No
Hear the sound from the Speaker?
No
No
Yes
Yes
Yes
Yes
Yes
No
No
Resetting the SPK pad according
to guide