Speaker Phone Path - LG TracFone LG840G Service Manual

4.18 Speaker phone path

QSC6270 LINE_OUT_R_N,LINE_OUT_L_P -> TP1,TP2-> Audio Sub System(M501) -> TP3 ,TP4 -> Speaker
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Sine wave appears at
Sine wave appears at
Change the Main board
LGE Internal Use Only
START
Yes
TP3,TP4?
No
Yes
TP1,TP2?
No
Change the Speaker
Change the Main board
Check the Audio Sub System
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4. TROUBLE SHOOTING
Only for training and service purposes