LG L601i Service Manual page 104

4.15.3 Loud Speaker path(voice speaker phone, VT, multimedia play, etc)
Loud speaker path as below:
MSM6250A HPL_L -> R523 -> C525 -> R524 -> U502(AMP) -> CN501 ->
MAIN 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
22 and 23 pin of CN501
The sine wave appear at
Speaker soldering point?
Can you hear the tone?
Start
NO
R523?
YES
NO
C525, R524?
YES
NO
YES
NO
YES
NO
YES
END
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4. TROUBLE SHOOTING
Change the Main board
Check C526, C525, R524 or
Change the Main board
Check U502
Check connector pin and
Speaker soldering point.
Or Change the LCD FPCB
Change the speaker