Read LG 50PT350B-SG (CHASSIS:PB12K) Service Manual online
11. Analog TV Audio Trouble Shooting
Follow procedure analog TV video
trouble shooting
N
Check video output
Y
Check SIF Signal
TU1300 #9 Pin
N
Y
N
Y
Follow procedure All source audio
trouble shooting
N
Maybe Mstar S7LR audio block has
problems.
Replace It
N
Y
Check Tuner Power
(5.0V, 3.3V, 1.2V)
Replace one of L506/L509/IC600
& Recheck
Maybe Tuner(TU1300) has problems
Replace one of
C252/R246/R1332/Q1304/R1325
IC600 & Recheck
Check SIF Signal
< SIF waveform – sample >
- Defend on the input signal.
- Defend on the input signal.
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