Speaker Trouble Shooting - LG -D855 Service Manual

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)
Yes
Yes
Yes
Yes
LGE Internal Use Only
START
Check the Speaker soundand check
Speaker wire.
Hear the sound from the Speaker?
No
1. Speaker Pin is OK on the contact
point?
Yes
Change Speaker.
Can you hear a sound?
No
2. Check
Main PCB part
(L6204,L6203) Speaker signal OK?
No
2. Check
Main PCB part (Speak Amp)
(FB6201,FB6202)
Speaker signal OK?
No
Change Main Board
End
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3. TROUBLE SHOOTING
No
Resetting the SPK pad according
to guide
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