Read LG 52LG70-UA (CHASSIS:LA86A) Service Manual online
- 25 -
C
2008
T
V/CATV
Check T
U
1 Pin14(SIF)
Can you see the normal signa
l?
Check the input (Pin AN23) of BCM3553((IC
100).
Measure
w
a
vef
orm at C665 b
e
cause its mor
e eas
y
to ch
ec
k.
Can
you se
e the normal
w
a
vef
orm?
YES
NO
Coul
d
you mea
sure voltag
e of T
U
1 & IIC lines?
Are they
a
ll nor
mal?
NO
You should check po
w
e
r l
ine
& IIC lines.
YES
You shou
ld rep
lace T
UNER.
NO
After checking audio signal line,
y
ou sh
ould decide to replac
e
item or not.
Audio(In)
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