LG KF600w Service Manual page 112

Setting: After initialize 5515C,and then test handset.
START
YES
Check the voltage of 3pin of U408
Whether its range is 1.2~1.5V
YES
Check the signal level at
Each side of MIC
YES
Check the signal level at 4 pin of U408
YES
Check the soldering at C206 , C207
YES
Check the soldering of MIC network
YES
MIC will work properly
Checking Flow
Checking Flow
NO
NO
210
NO
NO
NO
Check the soldering at
U408
YES
Resolder U408
Resolder MIC
Resolder C206, C207
Resolder MIC network
Replace MSM or Main B/D
NO
Resolder U408