Read LG 52LG70-UA (CHASSIS:LA86A) Service Manual online
- 23 -
C
2008
R
GB PC
Check JK70
5.
Can
you se
e the normal
w
a
vef
orm?
YES
JK705 may have problem. Replace this Jack.
NO
Check the input (Pin AK16,AN15,AM15,AH16,AJ16)
of BCM355
x(I
C100).
Measure
w
a
vef
orm at C635,C
636,C637 and R755,R758
because its more eas
y to check.
Can
you se
e the normal
w
a
vef
orm?
Video
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 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
becaus
e 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
Click on the first or last page to see other 52LG70-UA (CHASSIS:LA86A) service manuals if exist.