LG 42LB7DF (CHASSIS:LJ81A) Service Manual ▷ View online
- 29 -
Check signal format
Is it supported?
Check signal
L700, L701. L702 / L704, L705, L706
Replace it.
Check signal
C638, C639, C640 / C628, C629, C630
Y
Y
N
Check J700 / J702
Replace connector
Y
N
Y
Replace it
N
Maybe BCM3553(IC100) has problems
Y
Check Component Cable
TROUBLESHOOTING
5. Component Video
5-2. Troubleshooting
- 30 -
Flash
(32MB)
DDR1(128MB)
(16Mx16x4)
DDR1(128MB)
(16Mx16x4)
TEA6420
Audio
SW
MTV416
(M
icom
)
NTP3000
(Digital AMP)
64Bit I/F
RGB-PC
HDMI
1/2/3
COMP 1
COMP 2
AV1
AV2
RGB-PC
I2S
MCLK
Digital out
COMP1
COMP2
AV1
AV2
BCM7412
(MPEG4
Decoder)
Analog
/Digital
Tuner
TC90512
DVI
I2S
SIF
SPDIF Out
CVBS
CVBS/Y/C
Y/
Cb
/Cr
R/G/B
DDR1
(64MB)
CS5340
L/R
Serial TP
20bits
12bit YC 4:2:2
NIM TUNER
TMDS_RX+-
EPM240F
MNT out (Audio Only)
TMDS341A
(3x1,S/W)
CVBS/Y/C
MC33078
(AMP)
L/R
RS232
RX/TX
DVI
4:2:2 20bit YC
Full HD(1080P)
WXGA(768P)
RF
Switch
DM1/DP1
Serial
TP
74HC04
SPDIF Out
(Coaxial)
Video
Front
End
Dual
HDMI
Rx
HD/SD
Video
Encoder
Audio
DSP
USB2.0
PKT
HSX
PCI/
EBI
HD-DVI
IB0
Parse2
RSBUF
XCBUF
RMX0
BCM3553
Local KEY
24C16
74LVC14APW
X-tal(54M)
Reset
KIA7029
NVRAM
I2C
TROUBLESHOOTING
6. RGB Video
6.1 Block Diagram of Troubleshooting
- 31 -
Check signal format
Is it supported?
Check signal,
Hsync
,
Vsync
C745, C746, C747, R839, R843
Replace it.
Check signal
R727, R714, R729
Y
Y
N
Check P701
Replace connector
Y
N
Y
Replace it
N
Maybe BCM3553(IC100) has problems
Check L708 Voltage Level 9V
Y
Replace L708 / Q701 / Q702 / Q703
N
Check Signal
C635, C636, C637
Y
Replace it
N
Check RGB Cable
Y
TROUBLESHOOTING
6. RGB Video
6.2 Troubleshooting
- 32 -
Flash
(32MB)
DDR1(128MB)
(16Mx16x4)
DDR1(128MB)
(16Mx16x4)
TEA6420
Audio
SW
MTV416
(M
icom
)
NTP3000
(Digital AMP)
64Bit I/F
RGB-PC
HDMI
1/2/3
COMP 1
COMP 2
AV1
AV2
RGB-PC
I2S
MCLK
Digital out
COMP1
COMP2
AV1
AV2
BCM7412
(MPEG4
Decoder)
Analog
/Digital
Tuner
TC90512
DVI
I2S
SIF
SPDIF Out
CVBS
CVBS/Y/C
Y/
Cb
/Cr
R/G/B
DDR1
(64MB)
CS5340
L/R
Serial TP
20bits
12bit YC 4:2:2
NIM TUNER
TMDS_RX+-
EPM240F
MNT out (Audio Only)
TMDS341A
(3x1,S/W)
CVBS/Y/C
MC33078
(AMP)
L/R
RS232
RX/TX
DVI
4:2:2 20bit YC
Full HD(1080P)
WXGA(768P)
RF
Switch
DM1/DP1
Serial
TP
74HC04
SPDIF Out
(Coaxial)
Video
Front
End
Dual
HDMI
Rx
HD/SD
Video
Encoder
Audio
DSP
USB2.0
PKT
HSX
PCI/
EBI
HD-DVI
IB0
Parse2
RSBUF
XCBUF
RMX0
BCM3553
Local KEY
24C16
74LVC14APW
X-tal(54M)
Reset
KIA7029
NVRAM
I2C
TROUBLESHOOTING
7. AVVideo
7-1. Block Diagram of Troubleshooting
Click on the first or last page to see other 42LB7DF (CHASSIS:LJ81A) service manuals if exist.