Read LG 52LG70-UA (CHASSIS:LA86A) Service Manual online
- 20 -
C
2008
Check JK701, JK707
Can
you se
e the normal
w
a
vef
orm?
NO
JK701,JK707 ma
y
h
a
ve problem. Repl
ace this Jack.
Check the in
put (Pin AN17,AM19) of BCM3
553(IC100).
Measure
w
a
vef
orm at C651,C
652 bec
ause it
s more eas
y
to
check.
Can
you se
e the normal
w
a
vef
orm?
AV
YES
Video
NO
T
h
is board has big problem because Main c
h
ip(BCM
3553) have some troubles.
After checking
thoroug
hl
y al
l p
a
th once ag
ain
,
You should decide to replace
BCM3553 or not.
Check all po
w
e
r domain of FR
C-9459M (IC1000)
(3.3V, 1.3V_CORE,1.3V_PLL,3.3V,1.8V,2.5V)
& cry
stal output (X
1000 / 20.25MHz)&FRC_RESET
Measure Po
w
e
r &
w
a
veform a
t L1008,L1
007,
L100
2,L10
13,
L1014,L1015~
L1018&C1006&R1029
because its more eas
y to check.
Can
you se
e the normal
w
a
vef
orm?
YES
T
h
is board has
big prob
lem b
e
cause F
RC c
h
ip(F
RC-
945
9
M) 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
FRC-945
9M.
Althoug
h
you r
eplac
e it,
y
ou c
annot see n
o
rm
al disp
la
y, de
cide to repl
ace
Main chi
p(BC
M3553)
YES
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