LG 50PK550 Service Manual page 65

11. Analog TV Audio Trouble Shooting
Check video output
Y
Check Tuner Power
(5.0V, 3.3V, 1.2V)
Y
Check SIF Signal
TU600 #9 Pin
Y
Check SIF Signal
C308
Y
Follow procedure All source audio
trouble shooting
Customer Oriented R&D
N
Follow procedure analog TV video
trouble shooting
N
Replace one of L601/L600/L602
& Recheck
N
Maybe Tuner(TU600) has problems
Replace one of
N
R315/C308/Q603/C616/R622
& Recheck
N
Maybe BCM3556 audio block has
problems. Replace It
< SIF waveform – sample >
- Defend on the input signal.
Breakthrough