LG KF600w Service Manual page 101

R403
START
Check the DSP Trouble
YES
Check audio signal at C 431, C432
YES
Check the voltage at R 409,
R413, R414
YES
Check the clock signal at R410
YES
Check the audio signal at CON 402
YES
Check the state of speaker contact
YES
Test point
Test point
U409 R414
U404
Checking Flow
Checking Flow
Check the soldering at
C431, C432
NO
YES
Replace U 301
NO
Check the voltage at
R403
NO
Check the soldering at
U404
NO
R410
R409
R413
C431 C432
NO
NO
YES
NO
YES
Replace MSM or Main B/D
Resolder C431. C432
Replace U301
Resolder U401 with heat gun
Replace U404
Resolder U404 with heat gun