Read LG 52LG50DC-UA (CHASSIS:LA84Z) Service Manual online
- 27 -
C
2008
1
1. MNT OUT
-AUDIO(OUT)
Check the outp
ut (Pin AN28, AP29) of BCM3553(IC
100).
Measure
w
a
vef
orm at R685, R
686 bec
ause ití
s more eas
y
to
check.
Can you see the normal signa
l?
NO
T
h
is board has big problem because Main c
h
ip(BCM3553) have some troubles.
After checking
thoroug
hl
y al
l p
a
th once ag
ain
,
You should d
e
cide
to rep
lac
e
BCM355
3 or not.
Check the input of JK705.
Can
you se
e the normal
w
a
vef
orm?
YES
NO
After checking audio signal line,
y
ou should decide to replac
e
item or not.
YES
After checking the Jack, y
ou s
hould
decide to replace item o
r not.
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