LG 47LG50DC (CHASSIS:LA85Z) Service Manual ▷ View online
C
2008
- 21 -
5. HDMI-VIDEO
Check input connect JK600,J
K601
Can
you se
e the normal
w
a
vef
orm?
Check DDC communication lines
(IC601, IC602)
JK600,JK601 may
have problem. Replace this Jack.
Check the outp
ut of PI3HDMI341AT
R(IC600)
_HDMI1,2
Can
you se
e the normal
w
a
vef
orm?
After checking
the Po
w
e
r of this chip,
y
ou should decide to replac
e this or not.
Check HDCP communication lines(IC102)
After checking
the Po
w
e
r of this chip,
y
ou should decide to replac
e this or not.
YES
YES
YES
NO
NO
NO
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 d
e
cide
to rep
lac
e
BCM355
3 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 itís 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
M
a
in
ch
ip
(B
C
M
3553
)
YES
C
2008
- 22 -
6. TV/CA
TV
-AUDIO(IN)
Check T
U
1 Pin14(SIF)
Can you see the normal signa
l?
Check the input (Pin AN23) of BCM3553((IC
100).
Measure
w
a
vef
orm at C665 b
e
cause itís mor
e eas
y
to ch
ec
k.
Can
you se
e the normal
w
a
vef
orm?
YES
NO
Coul
d
you mea
sure voltag
e of T
U
1 & IIC lines?
Are they
a
ll nor
mal?
NO
You should check po
w
e
r l
ine
& IIC lines.
YES
You shou
ld rep
lace T
UNER.
NO
After checking audio signal line,
y
ou should decide to replac
e
item or not.
- 23 -
C
2008
7. A
V/COMPONENT/RGB_PC-AUDIO(IN)
Check JK705, JK701, JK700,
JK702, JK704.
Can
you se
e the normal
w
a
vef
orm?
NO
JK701, JK705, JK700, JK702, JK703 may have problem. Replace this
Jack
.
Check the in
put (Pin AIN6A,
AIN6B,AIN1A,AIN1B
,
AI
N
3
A,
AI
N
3
B,
AIN
4
A,A
IN
4
B,A
IN2A
,A
IN2B
) of CS5345(IC
500).
Can
you se
e the normal
w
a
vef
orm?
NO
YES
After checking audio signal line,
y
ou should decide to replac
e
item or not.
YES
Check the Output (Pin SDOU
T,SCLK,LRCK)
of CS5345(IC
500).
Can
you se
e the normal
w
a
vef
orm?
NO
After checking
the Po
w
e
r & MLCK & reset of this chip,
yo
u shou
ld dec
ide to repl
ace this or not.
YES
Check the in
put (Pin AH24,AJ24,AK24) of BCM355
3((IC100).
Measure
w
a
vef
orm at R554,R
561,R555 bec
ause itís more e
a
s
y
to check.
Can
you se
e the normal
w
a
vef
orm?
NO
After checking audio signal line,
y
ou should decide to replac
e
item or not.
- 24 -
C
2008
8. HDMI-AUDIO(IN)
Check input connect JK600,J
K601
Can
you se
e the normal
w
a
vef
orm?
Check DDC communication lines
(IC601, IC602)
JK600,JK601 may
have problem. Replace this Jack.
Check the outp
ut of PI3HDMI341AT
R(IC600)_HDMI1/2
Can
you se
e the normal
w
a
vef
orm?
After checking
the Po
w
e
r of this chip,
y
ou should decide to replac
e this or not.
Check HDCP communication lines(IC102)
After checking
the Po
w
e
r of this chip,
y
ou should decide to replac
e this or not.
YES
YES
YES
NO
NO
NO
NO
After checking
the Po
w
e
r & Select Pin & Etc of this
chip,
y
o
u should decide to replace this or not.
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