Read LG 52LG72-UA (CHASSIS:LA86B) Service Manual online
- 24 -
C
2008
Check TU1 Pin16(Video out
put)
Can y
o
u see t
h
e n
o
rmal sign
al?
Check the input(Pin1) of
LP
F(IC808).
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
YES
NO
Could y
o
u measu
re
v
o
ltag
e o
f T
U
1 & IIC lin
es?
A
re they
all normal?
Check the output(Pin8)
of LPF(IC808).
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
Check the input(Pin
A
N
16) o
f BCM355x(IC
100).
Measure
w
a
v
e
form at C658
because itís mo
re eas
y
to
check.
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
NO
You should check po
w
e
r
line
& IIC li
nes.
YES
You should replace TUNER.
NO
A
ft
e
r checking
v
ideo signal line & the Pow
e
r of
LPF y
ou should
decide to replace item or not.
NO
A
ft
e
r ch
ec
kin
g th
e Po
w
e
r of L
P
F y
ou sh
ou
ld
decid
e to
replace L
P
F
o
r n
o
t.
YES
This board ha
s big
problem
because Main chip(BCM355x) ha
v
e
some troubles.
A
ft
e
r ch
ec
kin
g th
orou
ghly
all p
a
th
once again
, You
sho
uld d
ecid
e
to rep
lace BCM
355x o
r n
o
t.
T
V/CATV
YES
YES
Video
Click on the first or last page to see other 52LG72-UA (CHASSIS:LA86B) service manuals if exist.