Main Microphone - LG CU400 Service Manual

4. TROUBLE SHOOTING

4.17 Main microphone

MIC300 → C323,C324 → MIC1P,MIC1N(MSM6280)
Start
Make a call
MIC_BIAS(C313 or C320)
is 1.8V
Make sound to MIC
Sine wave appears at
C323,C324 ?
Change the Main board
LGE Internal Use Only
NO
YES
NO
YES
NO
- 104 -
Change main board
Change the MIC
YES
Work well?
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Only for training and service purposes