Read LG 52LG72-UA (CHASSIS:LA86B) Service Manual online
- 30 -
C
2008
T
V/CATV
Check TU1 Pin14(SIF)
Can y
o
u see t
h
e n
o
rmal sign
al?
Check the input (Pin
A
N
23) of BCM355x((I
C100).
Measure
w
a
v
e
form at C665
because itís mo
re eas
y
to
check.
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
YES
Could y
o
u measu
re
v
o
ltag
e o
f T
U
1 & IIC lin
es?
A
re they
all normal?
NO
You should check po
w
e
r
line
& IIC li
nes.
YES
You should replace TUNER.
NO
NO
A
ft
e
r checking audio signal line, y
ou should
decide to
replace item or not.
Audio(In)
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