LG 52LG50FD-SA (CHASSIS:LJ82B) Service Manual ▷ View online
C
2008
- 21 -
TROUBLESHOOTING
Flash
(32MB)
DDR1(128MB)
(16Mx16x4)
DDR1(128MB)
(16Mx16x4)
TEA6420
Audio
SW
MT
V416
(Micom)
NTP3000
(Digital AMP)
64Bit I/F
RGB-
P
C
HDM
I
1/2
/3
COMP 1
COMP 2
AV1
AV2
RGB-
P
C
I2S
MCLK
Digital out
COMP1
COMP2
AV1
AV2
B
C
M
7412
(MPEG4
D
eco
de
r)
Analog
/Digital
Tuner
TC
9051
2
DVI
I2S
SIF
SPDIF Out
CVB
S
CVBS/Y/C
Y/Cb/Cr
R/G/B
DDR1
(64MB)
CS5340
L/
R
Se
ria
l TP
20b
its
12b
it YC
4
:2:2
NIM TUNER
TMDS_
RX+-
EPM240F
MNT out (Audio Only
)
T
M
D
S
341
A
(3x1
,S
/W
)
CVBS/Y/C
MC33078
(A
M
P
)
L/
R
R
S
232
RX/TX
DVI
4:
2:2 20bit YC
Full H
D
(1080
P)
WXGA(
7
6
8
P
)
RF
Sw
it
c
h
DM1/DP
1
Se
ria
l
TP
74HC
04
SPDIF Out
(Co
axi
al)
Video
Fro
nt
End
Du
al
HDMI
Rx
HD/SD
Video
Encoder
Aud
io
DSP
USB2.0
PKT
HSX
PCI/
EBI
HD-DVI
IB
0
Pa
rs
e2
RSBUF
XCBUF
RMX0
BCM3553
Local KEY
24
C16
74LV
C
14AP
W
X-tal(54M)
R
eset
K
IA7029
NVRAM
I2C
Power-Up Boot Fail
C
2008
- 22 -
Check P800, P801 All
Voltage Level (19V, 12V, 6V,
3.3V)
Check Power connector
OK ?
Replace Power board
Y
N
Y
Check IC804 #2 Pin / L805
Voltage Level 3.3V
Replace IC804 / L805 &
Recheck
Y
N
Check IC803 #5 Pin / L807
Voltage Level 2.6V
Replace IC803 or L807 &
Recheck
Y
N
Check C830, C853, C856
Voltage Level 1.2V
Replace IC802 or IC805 &
Recheck
Y
N
Check X200 Clock
54MHz
Replace X200
Y
N
Check R154 Clock
33MHz
Maybe BCM3553 has troubles.
Y
N
Replace IC101 Flash Memory
N
N
N
Check Micom IC407
Redownload or replace
Power-Up Boot Fail
C
2008
- 23 -
Flash
(32MB)
DDR1(128MB)
(16Mx16x4)
DDR1(128MB)
(16Mx16x4)
TEA6420
Audio
SW
MT
V416
(Micom)
NTP3000
(Digital AMP)
64Bit I/F
RGB-
P
C
HDM
I
1/2
/3
COMP 1
COMP 2
AV1
AV2
RGB-
P
C
I2S
MCLK
Digital out
COMP1
COMP2
AV1
AV2
B
C
M7412
(MPEG4
D
eco
de
r)
Analog
/Digital
Tuner
TC
9051
2
DVI
I2S
SIF
SPDIF Out
CVB
S
CVBS/Y/C
Y/Cb/Cr
R/G/B
DDR1
(64MB)
CS5340
L/
R
Se
ria
l TP
20b
its
12b
it YC
4
:2:2
NIM TUNER
TMDS_
RX+-
EPM240F
MNT out (Audio Only
)
T
M
D
S
341
A
(3x1
,S
/W
)
CVBS/Y/C
MC33078
(A
M
P
)
L/
R
R
S
232
RX/TX
DVI
4:
2:2 20bit YC
Full H
D
(1080
P)
WXGA(
7
6
8
P
)
RF
Sw
it
c
h
DM1/DP
1
Se
ria
l
TP
74HC
04
SPDIF Out
(Co
axi
al)
Video
Fro
nt
End
Du
al
HDMI
Rx
HD/SD
Video
Encoder
Aud
io
DSP
USB2.0
PKT
HSX
PCI/
EBI
HD-DVI
IB
0
Pa
rs
e2
RSBUF
XCBUF
RMX0
BCM3553
Local KEY
24
C16
74LV
C
14AP
W
X-tal(54M)
R
eset
K
IA7029
NVRAM
I2C
No OSD
C
2008
- 24 -
Check D901 Pin #1
Voltage Level 12V
Check
Power connector
Replace Power board
Check P903
#33(TXAC-) , #32(TXAC+) ,
#17(TXBC-) , #16(TXBC+)
Maybe BCM3553 has problems
Check LVDS Cable
Check PDP/LCD Module
Control board
Y
N
Y
Y
N
Check L901
Voltage Level 12V
Replace L901
Y
N
Y
Replace Cable
N
No OSD
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