Rear MIC is
inoperative
Replace Rear
Mic
Measure Mic Bias at R6403
Isolate problem, replace rear mic
4.5 < V < 4.9
Inspect SSI_Red_Tx_Codec
audio data to OMAP by using
Oscilloscope at R6118.
Are Parts Solder
Connectons and
Placement Correct
Replace or Repair
Parts.
Replace Main Board
Is rear mic functional
Is SSI Audio
Data Present
Replace Main Board
View SSI Signals
at R2819, R2807, and
R2808 using an Oscilloscope
Inspect MIC Bias Circuit
U6402 and Supporting
Circuitry
Replace Main Board
Yes
No
Yes
No
Yes
Yes
No
No
Synopsis
This failure specifically refers to the rear microphone
but this flowchart can be used to diagnose front side
microphone also. All mics mentioned above have
similar paths and have very limited differences.
Please refer to schematic and theory of operation
section for differences
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