LG KU950 Service Manual page 122

4.17.3. Loud speaker path (voice speaker phone, VT, multimedia play, etc)
Loud speaker path as below:
MSM6275A HPH_R, HPH_L → C709,C710 → U701 ( audio codec) → R710, R711
→ U702 (Speaker AMP) → FB701, FB703 → Speaker
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Set phone with speaker phone mode
Start
The sine wave appear at
C709,C710?
YES
The sine wave appear at
R710,R711?
YES
The sine wave appear at
FB701,FB703?
YES
Can you hear the tone?
YES
END
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4. TROUBLE SHOOTING
NO
Change the Main board
NO
Check C722,C723,U701 or
Change the Main board
NO
Check U702
NO
Change the speaker