DOWNLOAD LG 42SL90QD-SA (CHASSIS:LJ91L) Service Manual ↓ Size: 4.82 MB | Pages: 72 in PDF or view online for FREE

Model
42SL90QD-SA (CHASSIS:LJ91L)
Pages
72
Size
4.82 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42sl90qd-sa-chassis-lj91l.pdf
Date
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11. Analog TV Audio 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
11. Analog TV Audio Trouble Shooting
Follow procedure analog TV video 
trouble shooting
N
Check video output
Y
Y
N
Y
Check SIF Signal
C128 at Jack Board
N
Replace one of C123, R120, R121, 
R124, L109, Q101, C128
& Recheck
Y
Follow procedure All source audio 
trouble shooting
N
Maybe BCM3556 audio block has 
problems. Replace It
Y
Replace one of
L505/L514/C502/C511/Q500/Q502
IC501 & Recheck
Check SIF Signal
IC501 #4 Pin
Check SIF Signal
TU101 #6 Pin and R118 at Jack 
Board
N
Check SIF Signal
R704 and C106 at Main Board
N
Replace one of R704/R128/C106
& Recheck
Y
Maybe Tuner(TU101) 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/ Q812/ IC804/ 
IC809/Q809/+5V_ST and +12V of 
P801 at Main Board& Recheck
Check cable between P203 at Jack 
Board and P701 at Main Baord
N
Maybe Cable Pin has problems
Y
12. Component / RGB / AV Audio 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
12. Component / RGB / AV Audio Trouble Shooting
Y
Check Jack JK208/JK209
N
Y
Check Signal
R235, R236 (Comp1)
R216, R217 (Comp2)
R249, R250 (RGB)
R219, R221 (AV1)
R218, R220 (AV2)
at Jack Board
N
Replace Jack
Check Video Output
Replace one of
R235/R236/C231/C232 (Comp1)
R216/R217/C207/C208 (Comp2)
R219/R221/C210/C212 (AV1)
R218/R220/C209/C211 (AV2)
R249/R250/C246/C247 (RGB)
& Recheck at Jack Board
N
Follow procedure external input 
video trouble shooting
Y
Check Signal
C206, C210, C211, C232, C220, 
C221, C224, C225, C226, C227 
at Main Board
N
Y
Y
Follow procedure All source audio 
trouble shooting
N
Maybe BCM3556 audio block has 
problems. Replace It
Check cable between P203 at Jack 
Board and P701 at Main Baord
N
Maybe Cable Pin has problems
Replace one of
R215/R228/C211/C232 (Comp1)
R229/R230/C220/C221 (Comp2)
R204/R214/C206/C210 (AV1)
R231/R232/C224/C225 (AV2)
R233/R234/C226/C227 (RGB)
& Recheck at Main Board
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