LG 50PJ350 Service Manual page 64

11. Analog TV Audio Trouble Shooting
Check video output
Y
Check Tuner Power
(5.0V, 3.3V, 1.2V)
Y
Check SIF Signal
TU1300 #9 Pin
Y
Check SIF Signal
Y
Follow procedure All source audio
trouble shooting
Customer Oriented R&D
N
Follow procedure analog TV video
trouble shooting
N
Replace one of L1300/L1301/L1302
& Recheck
N
Maybe Tuner(TU1300) has problems
Replace one of
N
C252/R246/R1332/Q1304/R1325
IC501 & Recheck
N
Maybe Mstar S7 audio block has
problems. Replace It
< SIF waveform – sample >
- Defend on the input signal.
Breakthrough