Read LG 42LH50YD (CHASSIS:LJ91C) Service Manual online
11. Analog TV Audio Trouble Shooting
Follow procedure analog TV
video trouble shooting
N
Check video output
Y
Check SIF Signal
TU1101 #8 Pin
N
Y
N
Y
Check SIF Signal
C141
N
Replace one of R113/R128
& Recheck
Y
Follow procedure All source
audio trouble shooting
N
Maybe BCM3556 audio block has
problems. Replace It
N
Y
Check Tuner Power
(5.0V, 2.5V, 3.3V, 1.2V)
Replace one of
L1108/L1105/L1100/L1107/L1109
& Recheck
Maybe Tuner(TU1101) has
problems
Replace one of
R1124,R1125,C1137,Q1101,R112
9
Recheck
Check SIF Signal
C1139
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