LG CT815 Service Manual page 116

4.10.3 Loud speaker path (voice speaker phone, Multimedia play)
Loud speaker path as below:
MSM7201A Line_OP,ON
Connect the phone to network
Equipm ent a nd setup call
Setup 1KHz tone out
Set phone with speaker phone mode
or Pl ay the multimedia contents
The sine wave appear at
The sine wave appear at
Can you hear th e tone?
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Only for training and service purposes
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C510, C511 U503 (Audio Subsystem)
Start
C510, C511 ?
YES
pads o f speaker ?
YES
YES
END
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4. TROUBLE SHOOTING
→
speaker, PAD
NO
Change the Main board
NO
Check U503
NO
Change the speaker
LGE Internal Use Only