LG 42PM4700 Service Manual page 58

11. Analog TV Audio Trouble Shooting
Check video output
Y
Check Tuner Power
(3.3V, 1.8V)
Y
Check SIF Signal
TU1001 #6 Pin
Y
Check SIF Signal
C241
Y
Follow procedure All source audio
trouble shooting
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Only for training and service purposes
N
Follow procedure analog TV video
trouble shooting
N
Replace one of L1108/L1109
& Recheck
N
Maybe Tuner(TU1000) has problems
Replace one of
N
Q1001, C1000, R1006, R1012, R1013
& Recheck
N
Maybe MTK5369(IC100) audio
block has problems. Replace It
LGE Internal Use Only