Read LG 42LG60 (CHASSIS:LA84B) Service Manual online
C
2008
- 21 -
Ch
eck JK
700,
JK70
2.
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
JK700,JK702
may
ha
v
e
pro
b
lem. Replace this Jack.
Check th
e in
put (Pin
A
L
21,
A
M
2
1
,A
N
2
1 a
nd Pin
A
N
2
2
,A
L22,
A
P
22)
of BCM3553(I
C100).
Measure
w
a
v
e
form at C638,
C639,C
640 an
d C628,C629,C630
becau
se it
s more easy
to
check.
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
YES
NO
NO
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.
Check all p
o
w
e
r d
o
main
o
f
FRC-945
9M (IC100
0)
(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
M
a
in
c
h
ip
(B
C
M
3553
)
YES
Component
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