Read LG 42SL80YD-SA (CHASSIS:LJ91T) Service Manual online
11. Analog TV Audio Trouble Shooting
Follow procedure analog TV video
trouble shooting
N
Check video output
Y
Y
N
Y
Check SIF Signal
C128 at Jack Board
N
Replace one of C123, R120, R121,
R124, L109, Q101, C128
& Recheck
Y
Follow procedure All source audio
trouble shooting
N
Maybe BCM3556 audio block has
problems. Replace It
Y
Replace one of
L505/L514/C502/C511/Q500/Q502
IC501 & Recheck
Check SIF Signal
IC501 #4 Pin
Check SIF Signal
TU101 #6 Pin and R118 at Jack
Board
N
Check SIF Signal
R704 and C106 at Main Board
N
Replace one of R704/R128/C106
& Recheck
Y
Maybe Tuner(TU101) has problems
Check Tuner(TU101) Power
(5.0V, 2.5V, 3.3V, 1.2V)
N
Replace one of IC101, IC102 at
Jack Board or IC803/ Q812/ IC804/
IC809/Q809/+5V_ST and +12V of
P801 at Main Board& Recheck
Check cable between P203 at Jack
Board and P701 at Main Baord
N
Maybe Cable Pin has problems
Y
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