LG KT520 Service Manual page 107

4. TROUBLE SHOOTING
4.10.3 Microphone (Voice call, Voice Recorder, Video Recorder)
Microphone Signal Flow
•
- MIC is enable by MIC Bias
- CCO, MIC1P, MIC1N signals to AB3000• Check Points
• Check Points
- Microphone bias
- Audio signal level of the microphone
- Soldering of components
• Signal from the mic
- MIC →
- R616 on main board →
- C624,C625 on main board →
- AB3000
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