Read LG 42LB9RTA (CHASSIS:LP7BB) Service Manual online
- 22 -
Sy
mpto
m
L
E
D
is
Green
S
c
re
e
n
i
s
e
x
istent, but
so
und isn't
C
h
eck f
o
llow
18. N
o Sound
All input (mode)
is no soun
d
?
Is the speaker
on in men
u?
Is the speaker
cable n
o
rmal
?
IC400 op
erate
normally
?
Set on speaker
in menu
Check the
Speaker cable
Repl
ace
IC400
IC401 op
erate
normally
?
Repl
ace
IC401
IC402 op
erate
normally
?
Repl
ace
IC402
Replace VSC
B/D
On
ly
HD
MI i
s
no
Soun
d
?
Do
w
n
load the EDID data
Only
AV input is
no
Soun
d
?
Is the output
of IC300(pin52,53)
normal?
Check the signal
after IC300
refer to circuit diagr
am
Repl
ace
IC300
Only
RF is
no
Soun
d
?
Check the T
uner In/Out
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
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