LG KF600w Service Manual page 107

Checking Flow: Headset receiving path problem
Checking Flow: Headset receiving path problem
2
YES
Check audio signal at C431, C432
YES
Check the audio signal at C433 , C434
YES
Check the audio signal at C 408, C412
YES
Check the soldering of CON402
Replace Main B/D
Check the soldering at
C431, C432
NO
Check the soldering at
C433, C434
NO
Resolder C433, C434
Check the voltage at
R425 whether it is 2.6V
NO
Resolder R425
Resolder CON402
NO
NO
YES
NO
YES
NO
YES
Redownload S/W
Resolder C431. C432
Resolder U409
with heat gun
NO
Replace U409
Resolder U404
with heat gun
NO
Replace U404