DOWNLOAD LG 42LH70YD (CHASSIS:LJ91D) Service Manual ↓ Size: 10.45 MB | Pages: 73 in PDF or view online for FREE

Model
42LH70YD (CHASSIS:LJ91D)
Pages
73
Size
10.45 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lh70yd-chassis-lj91d.pdf
Date
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3. Digital TV Video Trouble Shooting
D-sub RGB
HDMI 1
AV2
SIDE_CVBS, SIDE_L/R, SIDE_DET
DDR2 (1Gbit)
Elpida/Hynix
NAND Flash
(512Mbit)
Digital Audio (Optic)
USB
Digital AMP
NTP3100L
RS-232C (Ctrl./SVC)
3x1 
HDMI Switch
I2S
NVRAM
RGB/H/V
VA1G5BF8005
DDR_Data[0:15], DQS, DM …
DDR2 (1Gbit)
Elpida/Hynix
Data[16:31]
Addr.[0:13], ctrl. data
MICOM
(MTV416GMF)
MAX3232
BCM3556
BCM3556
(Brazil)
(Brazil)
Data [0 … 7]
TU_SCLK, TU_SDATA, TU_SYNC
TU_SIF
TU_CVBS_IN
X-tal
RF_Switch, Gain_Switch
SDA0/SCL0_3.3V 
Reset Switch
JTAG
CLK,TDI,TDO,MS,RST
X-tal
24MHz
AV1
Component 1
Y Pb Pr, L/R, DET
CVBS, L/R, AV_DET
CS ,RE,WE……
Component 2
Y Pb Pr, L/R, DET
Audio L/R
Audio L/R (for RGB)
HDMI 2
HDMI 3
SPDIF
RX/TX
RX/TX
Reset IC
54MHz
JACK BACK
JACK BACK
at REAR
at REAR
SCL, SDA_3.3V
SCL, SDA_3.3V
FRC IC
(MST7323S)
DDR2(256Mbit)
Qimonda/Hynix
FRC Block
FRC Block
LVDS
LCD Module
(FHD, 120Hz)
Overall Block Diagram
for Brazil DTV (LH70)
X-tal
12MHz
Bluetooth Module
DP1/DM1
USB_DM1
USB_DP1
DP2/DM2 
USB_DM2
USB_DP2
O.C. Protector
+5V
+5V
3. Digital TV Video Trouble Shooting
Check RF Cable
Y
Check TP Clock, Data, Sync
R107, R108, R109
N
Maybe Tuner(TU101) has problems
Y
Maybe BCM3556(IC100)
has problems
Check Tuner(TU101) Power
(5.0V, 2.5V, 3.3V, 1.2V)
N
Replace one of IC101, IC102 at 
Jack Board or IC803/ IQ812/ C804/ 
Q809/+5V_ST and +12V of P801 at 
Main Board& Recheck
Y
Check cable between P203 at Jack 
Board and P701 at Main Baord
N
Maybe Cable Pin has problems
Y
4. Analog TV Video Trouble Shooting
D-sub RGB
HDMI 1
AV2
SIDE_CVBS, SIDE_L/R, SIDE_DET
DDR2 (1Gbit)
Elpida/Hynix
NAND Flash
(512Mbit)
Digital Audio (Optic)
USB
Digital AMP
NTP3100L
RS-232C (Ctrl./SVC)
3x1 
HDMI Switch
I2S
NVRAM
RGB/H/V
VA1G5BF8005
DDR_Data[0:15], DQS, DM …
DDR2 (1Gbit)
Elpida/Hynix
Data[16:31]
Addr.[0:13], ctrl. data
MICOM
(MTV416GMF)
MAX3232
BCM3556
BCM3556
(Brazil)
(Brazil)
Data [0 … 7]
TU_SCLK, TU_SDATA, TU_SYNC
TU_SIF
TU_CVBS_IN
X-tal
RF_Switch, Gain_Switch
SDA0/SCL0_3.3V 
Reset Switch
JTAG
CLK,TDI,TDO,MS,RST
X-tal
24MHz
AV1
Component 1
Y Pb Pr, L/R, DET
CVBS, L/R, AV_DET
CS ,RE,WE……
Component 2
Y Pb Pr, L/R, DET
Audio L/R
Audio L/R (for RGB)
HDMI 2
HDMI 3
SPDIF
RX/TX
RX/TX
Reset IC
54MHz
JACK BACK
JACK BACK
at REAR
at REAR
SCL, SDA_3.3V
SCL, SDA_3.3V
FRC IC
(MST7323S)
DDR2(256Mbit)
Qimonda/Hynix
FRC Block
FRC Block
LVDS
LCD Module
(FHD, 120Hz)
Overall Block Diagram
for Brazil DTV (LH70)
X-tal
12MHz
Bluetooth Module
DP1/DM1
USB_DM1
USB_DP1
DP2/DM2 
USB_DM2
USB_DP2
O.C. Protector
+5V
+5V
4. Analog TV Video Trouble Shooting
Check RF Cable
Y
Check CVBS Signal
TU101 #7 Pin and R118
N
Y
Check CVBS Signal
R703 and C110 at Main Baord
N
Replace one of R703 and C110
& Recheck
Y
Y
Maybe Tuner(TU101) has problems
Check Tuner(TU101) Power
(5.0V, 2.5V, 3.3V, 1.2V)
N
Maybe BCM3556(IC100)
has problems
Check cable between P203 at Jack 
Board and P701 at Main Baord
N
Maybe Cable Pin has problems
Y
Replace one of IC101, IC102 at 
Jack Board or IC803/ Q812/ IC804/ 
IC809/Q809/+5V_ST and +12V of 
P801 at Main Board& Recheck
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