LG L602i Service Manual page 108

4.16.3 Loud Speaker path(voice speaker phone, VT, multimedia play, etc)
Loud speaker path as below:
MSM6250A HPL_L -> R502 -> C501 -> R503 -> U500(AMP) -> CN600 -> Camera FPCB (b'd to b'd
connector) -> Speaker
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Set phone with speaker Phone mode
The sine wave appear at
The sine wave appear at
The sine wave appear at
14 and 15 pin of CN600
The sine wave appear at
Speaker soldering point?
Can you hear the tone?
Start
NO
R502?
YES
NO
C501, R503?
YES
NO
YES
NO
YES
NO
YES
END
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4. TROUBLE SHOOTING
Change the Main board
Check R502, C501, R503 or
Change the Main board
Check U500
Check connector pin and
Speaker soldering point.
Or Change the Camera FPCB
Change the speaker