Read LG 42LB1R (CHASSIS:LP7BA) Service Manual online
- 23 -
Sy
mpto
m
LE
D
is
Green
Sc
re
en
i
s
e
x
istent, but
so
und isn’t
Ch
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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