Read LG 42LG60 (CHASSIS:LA84B) Service Manual online
C
2008
- 19 -
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 BCM3553(IC
100).
Measure
w
a
v
e
form at C658
because it
s more easy
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
o
u 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.
This board ha
s big
problem
because Main chip(BCM3553) ha
v
e
some troubles.
A
ft
e
r ch
ec
kin
g th
orou
ghly
all p
a
th
once ag
ain
, You
sho
uld d
ecid
e
to rep
lace BCM
3553 o
r n
o
t.
YES
YES
NO
Check all po
w
e
r domain of
FRC-9459M (IC1000)
(3.3V, 1.3V_C
ORE,1.3V_PL
L,3.3V,1.8V,2.5V)
& cr
y
s
tal output (X1000 / 20.25MHz)&FR
C_RESET
Measure Po
w
e
r &
w
a
v
e
for
m
at L1008,L1007,L1002,L1013,
L
1014,L
101
5~
L
1018&
C10
06
&R10
29
becau
se it
s more easy
to
check.
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
YES
This board ha
s big
problem
because FRC chip(FRC-9459M) hav
e
some troubles.
A
ft
e
r checking thoroughly
all path
once
again, You should decide
to replace
FRC-945
9M.
A
lthough y
ou
replace it, y
ou cannot see normal display
, decide to replace
Main chip(BC
M3553)
YES
TA/CATV
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