DOWNLOAD LG 52LG72-UA (CHASSIS:LA86B) Service Manual ↓ Size: 3.74 MB | Pages: 46 in PDF or view online for FREE

Model
52LG72-UA (CHASSIS:LA86B)
Pages
46
Size
3.74 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
52lg72-ua-chassis-la86b.pdf
Date
PREV: LG 52LG70YR-TA (CHASSIS:LP81D) Service Manual

LG 52LG72-UA (CHASSIS:LA86B) Service Manual ▷ View online

- 21 -
C
2008
LCD Power Block Diagram
ST_5V
ST_5V
IC
404
A
Z
1117H
-3
.3
IC
404
A
Z
1117H
-3
.3
3.
3V
ST_MICOM
3.
3V
ST_MICOM
IC
402
MA
X3232C
D
R
IC
402
MA
X3232C
D
R
IC
408
M
C
1
4053
B
D
R2G
IC
408
M
C
1
4053
B
D
R
2G
IC
407
M
T
V
416G
M
F
IC
407
M
T
V
416G
M
F
IC
405
K
IA
7029
A
F
IC
405
K
IA
7029
A
F
IR
 A
SSíY
IR
 A
SSíY
IC
406
A
T
24C16
A
N
IC
406
A
T
24C16
A
N
Q804
S
I4925
B
D
Y
Q804
S
I4925
B
D
Y
+
5
.0
V_SU
B
+
5
.0
V_SU
B
IC
803
B
D
9132
M
U
V
IC
803
B
D
9132
M
U
V
IC
802
A
Z
1117H
-3
.3
IC
802
A
Z
1117H
-3
.3
+3
.3
V
+3
.3
V
3.3V_TMD
S_SW
3.3V_TMD
S_SW
IC
807
A
Z
1117H
-1
.8
IC
807
A
Z
1117H
-1
.8
+1
.8
V
_
NTP
+1
.8
V
_
NTP
IC
501
N
T
P3000
IC
501
N
T
P3000
D1
.2
V
_
BCM
D1
.2
V
_
BCM
IC
809
S
C
156515
M
-1
.8T
R
IC
809
S
C
156515
M
-1
.8T
R
D3
.3
V
_
BCM
D3
.3
V
_
BCM
IC
810
S
C
156515
M
-2
.5T
R
T
IC
810
S
C
156515
M
-2
.5T
R
T
D2
.6
V
_
BCM
D2
.6
V
_
BCM
IC
101
S29G
L128
N
IC
101
S29G
L128
N
IC
401
74V
C
1
4
A
P
W
IC
401
74V
C
1
4
A
P
W
IC
300
~
3
H
Y
5
D
U5616
IC
300
~
3
H
Y
5
D
U5616
IC
304
S
C
2595S
T
R
IC
304
S
C
2595S
T
R
IC
100
BCM35
5
x
IC
100
BCM35
5
x
D1
.2
V
_
BCM
D1
.2
V
_
BCM
D3
.3
V
_
BCM
D3
.3
V
_
BCM
D2
.6
V
_
BCM
D2
.6
V
_
BCM
IC
503
T
C
74V
H
C
04F
T
IC
503
T
C
74V
H
C
04F
T
IC
502
C
S
5340
IC
502
C
S
5340
IC
403
A
T
24C512
W
IC
403
A
T
24C512
W
- 22 -
C
2008
P_
+16V
P_
+16V
+
12.0V
+
12.0V
+9
V
+9
V
IC
501
N
T
P3000
IC
501
N
T
P3000
IC
811
K
A
7809E
R
T
M
IC
811
K
A
7809E
R
T
M
IC
812
K
IA
78R05
F
IC
812
K
IA
78R05
F
+5
.0
V
+5
.0
V
Q901
S
I4925
B
D
Y
Q901
S
I4925
B
D
Y
Modul
e
T-co
n
Modul
e
T-co
n
LCD Power Block Diagram
IC
102
CA
T
2
4
C
0
8
W
I
IC
102
CA
T
2
4
C
0
8
W
I
IC
201
T
P
S2052
B
D
R
G4
IC
201
T
P
S2052
B
D
R
G4
IC
502
C
S
5340
IC
502
C
S
5340
IC
601
~
2
A
T
24C02
B
N
IC
601
~
2
A
T
24C02
B
N
IC
701
A
T
24C02
B
N
IC
701
A
T
24C02
B
N
IC
702
A
T
24C02
B
N
IC
702
A
T
24C02
B
N
IC
808
A
T
24C02
B
N
IC
808
A
T
24C02
B
N
- 23 -
C
2008
LCD Basic VIDEO PATH
A
T
/NT Tune
r
BCM355x
FMS6400
CVB
S
IF_V
SB/
QAM
SD_CVBS
1
ED
S
A
FE_I
F_
N
ED
S
A
FE_I
F_P
SD_
L1
SD_C1
S-v
ideo
AV
1
SD_CVBS
2
AV
2
SD_CVBS
3
Component1
SD_
Y
1
SD_PR1
SD_PB1
Component2
SD_
Y
2
SD_PR2
SD_PB2
RGB
SD_R
SD_
G
SD_B
RGB
_HS
YNC
RGB
_V
S
Y
NC
PI
3HDMI
3
4
1
ART
H
D
M
I1
,2,3
HDMI_RX
_
0
_CL
K_N
HDMI_RX
_
0
_CL
K_P
H
D
M
I_
R
X_0_
D
A
T
A
0_N
H
D
M
I_
R
X_0_
D
A
T
A
0_P
H
D
M
I_
R
X_0_
D
A
T
A
1_N
H
D
M
I_
R
X_0_
D
A
T
A
1_P
H
D
M
I_
R
X_0_
D
A
T
A
2_N
H
D
M
I_
R
X_0_
D
A
T
A
2_P
L
V
D
S
_T
X_0_
D
A
T
A
_0_N
L
V
D
S
_T
X_0_
D
A
T
A
_0_P
L
V
D
S
_T
X_0_
D
A
T
A
_1_N
L
V
D
S
_T
X_0_
D
A
T
A
_1_P
L
V
D
S
_T
X_0_
D
A
T
A
_2_N
L
V
D
S
_T
X_0_
D
A
T
A
_2_P
L
V
D
S
_T
X_0_
D
A
T
A
_3_N
L
V
D
S
_T
X_0_
D
A
T
A
_3_P
L
V
D
S
_T
X_0_
D
A
T
A
_4_N
L
V
D
S
_T
X_0_
D
A
T
A
_4_P
L
V
D
S
_T
X_1_
D
A
T
A
_0_N
L
V
D
S
_T
X_1_
D
A
T
A
_0_P
L
V
D
S
_T
X_1_
D
A
T
A
_1_N
L
V
D
S
_T
X_1_
D
A
T
A
_1_P
L
V
D
S
_T
X_1_
D
A
T
A
_2_N
L
V
D
S
_T
X_1_
D
A
T
A
_2_P
L
V
D
S
_T
X_1_
D
A
T
A
_3_N
L
V
D
S
_T
X_1_
D
A
T
A
_3_P
L
V
D
S
_T
X_1_
D
A
T
A
_4_N
L
V
D
S
_T
X_1_
D
A
T
A
_4_P
LVDS
_
T
X
_
0
_CL
K_N
LVDS
_
T
X
_
0
_
CL
K_P
LVDS
_
T
X
_
1
_CL
K_N
LVDS
_
T
X
_
1
_
CL
K_P
LVDS (Module)
TMD
S
141
HDMI4
FR
C
 9459
M A3
- 24 -
C
2008
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 BCM355x(IC
100).
Measure 
w
a
v
e
form at C658 
because itís mo
re eas
y
 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
ou 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.
YES
This board ha
s big 
problem
 because Main chip(BCM355x) ha
v
e
 some troubles.
A
ft
e
r ch
ec
kin
g th
orou
ghly
 all p
a
th 
once again
, You
 sho
uld d
ecid
e
to rep
lace BCM
355x o
r n
o
t.
T
V/CATV
YES
YES
Video
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