LG 42LH40ED / 42LH45ED (CHASSIS:LJ92J) Service Manual ▷ View online
Block Diagram
MPEG_TS
DDR2
256MB
DDR2
256MB
BCM3556
(400M MIPS)
BCM3556
(400M MIPS)
1080P
LVDS
(Front-end)
(External Input)
EXT_IN
HDMI0_BCM
CVBS_LIVE
TP1
CVBS1/
SIF1
SIF1
Ca
ble
ISDB-T/
PAL/NTSC
(System + DVR + Scalar)
(Analog DVR)
CVBS2/
SIF2
SIF2
ISDB-T/
PAL/NTSC
Serial
TP1
TP1
Serial
TP2
TP2
I2S_BCM
NTP3100L
NTP3100L
CVBS1
CVBS2
CVBS_LIVE
CVBS/Y_DVR
COMP1_LR
COMP2_LR
RGB_LR
2069_L/R_OUT1
CXA2069
CXA2069
2069_L/R_OUT2
EXT_IN
HDMI0_BCM
AV1
AV2
NANDFlash
128MB
NANDFlash
128MB
(Etc)
SW
SW
SIF2
SIF1
SPI BUS
USB2.0
SPDIF
SIF_DVR
SIF_LIVE
SIF_LIVE
2069_L/R_OUT1
TP2
I2S_BCM
SPIF225A
SPIF225A
HDD
HDD
CVBS/Y_DVR
SIF_DVR
2069_L/R_OUT2
SAA7164
SAA7164
MPEG_TS
DDR1
256Mb
DDR1
256Mb
Flash
256KB
Flash
256KB
CPLD
CPLD
Parallel TS
Serial
I2C
MSPI
TDA9996
TDA9996
(Comp1/2, RGB)
TU_CVBS_DVR
TU_CVBS_DVR
HDMI4
HDMI2
HDMI1
SIDE HDMI_PORT4
UI_HW_PORT1
UI_HW_PORT2
RMX
BCM_SPI_CSb/
BCM_SPI_MISO
TP REMUX PORT
BCM_SPI_MOSI/
BCM_SPI_SCK
BCM_SPI_SCK
MNT_VOUT_DVR
MNT_VOUT_DVR
MONITOR_LR+/-_OUT
AMP
AMP
MNT_LOUT
MNT_ROUT
MNT_L/ROUT
Not Stuffed
1. Power-Up Boot Fail Trouble Shooting
MPEG_TS
DDR2
256MB
DDR2
256MB
BCM3556
(400M MIPS)
BCM3556
(400M MIPS)
1080P
LVDS
(Front-end)
(External Input)
EXT_IN
HDMI0_BCM
CVBS_LIVE
TP1
CVBS1/
SIF1
SIF1
Ca
ble
ISDB-T/
PAL/NTSC
(System + DVR + Scalar)
(Analog DVR)
CVBS2/
SIF2
SIF2
ISDB-T/
PAL/NTSC
Serial
TP1
TP1
Serial
TP2
TP2
I2S_BCM
NTP3100L
NTP3100L
CVBS1
CVBS2
CVBS_LIVE
CVBS/Y_DVR
COMP1_LR
COMP2_LR
RGB_LR
2069_L/R_OUT1
CXA2069
CXA2069
2069_L/R_OUT2
EXT_IN
HDMI0_BCM
AV1
AV2
NANDFlash
128MB
NANDFlash
128MB
(Etc)
SW
SW
SIF2
SIF1
SPI BUS
USB2.0
SPDIF
SIF_DVR
SIF_LIVE
SIF_LIVE
2069_L/R_OUT1
TP2
I2S_BCM
SPIF225A
SPIF225A
HDD
HDD
CVBS/Y_DVR
SIF_DVR
2069_L/R_OUT2
SAA7164
SAA7164
MPEG_TS
DDR1
256Mb
DDR1
256Mb
Flash
256KB
Flash
256KB
CPLD
CPLD
Parallel TS
Serial
I2C
MSPI
TDA9996
TDA9996
(Comp1/2, RGB)
TU_CVBS_DVR
TU_CVBS_DVR
HDMI4
HDMI2
HDMI1
SIDE HDMI_PORT4
UI_HW_PORT1
UI_HW_PORT2
RMX
BCM_SPI_CSb/
BCM_SPI_MISO
TP REMUX PORT
BCM_SPI_MOSI/
BCM_SPI_SCK
BCM_SPI_SCK
MNT_VOUT_DVR
MNT_VOUT_DVR
MONITOR_LR+/-_OUT
AMP
AMP
MNT_LOUT
MNT_ROUT
MNT_L/ROUT
Not Stuffed
1. Power-Up Boot Fail Trouble Shooting
Replace Power board
N
Y
Check Micom IC407
Redownload or replace
Check P800 All Voltage Level
(20V, 12V, 5V_ST)
Check Power connector
Y
Check Voltage Level 3.3V at L815
N
Replace one of
IC807/IC802/L815/L823/L810/L826
& Recheck
Y
N
Check Voltage Level 2.5V at L827
N
Replace one of IC803/L824/L827
& Recheck
N
Y
Check Voltage Level 1.8V
at IC804 #6 pin
N
Replace one of IC804/L825
& Recheck
N
Y
Check Voltage Level 1.2V at L803
N
Replace one of
IC809/IC800/L803/L816/L819/L801
& Recheck
N
Y
Check X201 Clock 54MHz
N
Replace X201
Y
Check signal transition
at IC101 #9 pin
N
Maybe BCM3556 has troubles
Replace IC101 Flash Memory
Y
Check All Voltage Level
at L804/L807/L808
N
Replace one of L804/L807/L808
& Recheck
Y
2. No OSD Trouble Shooting
MPEG_TS
DDR2
256MB
DDR2
256MB
BCM3556
(400M MIPS)
BCM3556
(400M MIPS)
1080P
LVDS
(Front-end)
(External Input)
EXT_IN
HDMI0_BCM
CVBS_LIVE
TP1
CVBS1/
SIF1
SIF1
Ca
ble
ISDB-T/
PAL/NTSC
(System + DVR + Scalar)
(Analog DVR)
CVBS2/
SIF2
SIF2
ISDB-T/
PAL/NTSC
Serial
TP1
TP1
Serial
TP2
TP2
I2S_BCM
NTP3100L
NTP3100L
CVBS1
CVBS2
CVBS_LIVE
CVBS/Y_DVR
COMP1_LR
COMP2_LR
RGB_LR
2069_L/R_OUT1
CXA2069
CXA2069
2069_L/R_OUT2
EXT_IN
HDMI0_BCM
AV1
AV2
NANDFlash
128MB
NANDFlash
128MB
(Etc)
SW
SW
SIF2
SIF1
SPI BUS
USB2.0
SPDIF
SIF_DVR
SIF_LIVE
SIF_LIVE
2069_L/R_OUT1
TP2
I2S_BCM
SPIF225A
SPIF225A
HDD
HDD
CVBS/Y_DVR
SIF_DVR
2069_L/R_OUT2
SAA7164
SAA7164
MPEG_TS
DDR1
256Mb
DDR1
256Mb
Flash
256KB
Flash
256KB
CPLD
CPLD
Parallel TS
Serial
I2C
MSPI
TDA9996
TDA9996
(Comp1/2, RGB)
TU_CVBS_DVR
TU_CVBS_DVR
HDMI4
HDMI2
HDMI1
SIDE HDMI_PORT4
UI_HW_PORT1
UI_HW_PORT2
RMX
BCM_SPI_CSb/
BCM_SPI_MISO
TP REMUX PORT
BCM_SPI_MOSI/
BCM_SPI_SCK
BCM_SPI_SCK
MNT_VOUT_DVR
MNT_VOUT_DVR
MONITOR_LR+/-_OUT
AMP
AMP
MNT_LOUT
MNT_ROUT
MNT_L/ROUT
Not Stuffed
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