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Level 3 Repair
8-17
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z
Main MIC Working
Operate MIC
NG
Pollute
MIC Hole?
YES
Clean up
MIC hole
NO
Remove MIC,
Check MIC 4th pin
(MIC_BIAS_1.8V)
= 1.8V ?
Check
C504 = High?
NO
NO
Change main PBA
YES
YES
Change MIC
Change MIC