3. TROUBLE SHOOTING
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3.13.6 Sub MIC2 Trouble Shooting
A sub MIC2 (called MIC 3 during Loopback Test) is located at the top of PCB
It operates in case of voice call (Speaker phone).
START
Check the Mic signal by test mode
End
2. Check Mic Bias(1.77V) (VA6926)
works well ?
3. Check Mic Output (FB6922) works well ?
Change Main Board
1. Check Mic
hole and mesh and Mic Rubber
Voice Signal OK?
No
No
No
Yes
Yes
Yes
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