LG 42LB4D Installation guide

LG TRAINING MANUAL
42LB4D LCD - Fall 2007
LG TRAINING MANUAL

Published June 2007 by LGE USA Trainng Center
Customer Service (and Part Sales): 1-800-243-0000
Technical Support (and Part Sales): 1-800-847-7597
USA Website: www.lgusa.com (us.lge.com)
Customer Service Website: us.lgservice.com
B2B Service Website: aic.lgservice.com
Training Website: www.LGCSAcademy.com
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-visual service technicians. When servicing this product, under no circumstances should
the original design be modified or altered without permission from LG Electronics. Unauthorized modifications will not only void the warranty, but may lead
to property damage or user injury. All components should be replaced only with types identical to those in the original circuit and their physical location,
wiring, and lead dress must conform to original layout upon completion of repairs. If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it
only with the factory specified fuse type and rating. When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the resistor 10mm
away from PCB. Always keep wires away from high voltage or high temperature parts. Do not attempt to modify this product in any way.
Special components are also used to prevent shock and fire hazard and are required to maintain safe performance. No deviations are allowed without prior
approval by LG Electronics. Service work should be performed only after you are thoroughly familiar with these safety checks and servicing guidelines.
Circuit diagrams may occasionally differ from the actual circuit used. This way, implementation of the latest safety and performance improvement changes
into the set is not delayed until the new service literature is printed.
GENERAl SAFETY GuIdANCE
An lsolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer
of adequate power rating to protect against personal injury from electrical shocks. It will also protect the receiver and its components from being damaged
by accidental shorts of the circuitry that may be inadvertently introduced during the service operation. Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, etc., to be sure the set is safe to
operate without damage of electrical shock.
With the instrument AC plug removed from AC source, connect an electrical jumper across the two AC plug prongs. Place the AC switch in the on position,
connect one lead of ohm-meter to the AC plug prongs tied together and touch other ohm-meter lead in turn to each exposed metallic parts such as
antenna terminals, phone jacks, etc. If the exposed metallic part has a return path to the chassis, the measured resistance should be between 1MΩand
5.2MΩ. When the exposed metal has no return path to the chassis the reading must be infinite. Any other abnormality that exists must be corrected
before the receiver is returned to the customer.
ElECTROSTATICAllY SENSITIvE dEvICES
Some semiconductor (solid-state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive
(ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor “chip” components. The following
techniques should be used to help reduce the incidence of component damage caused by static electricity.
Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on the body by touch-
ing a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential
shock reasons prior to applying power to the unit under test. After removing an electrical assembly equipped with ES devices, place the assembly on
a conductive surface such as an ESD mat, to prevent electrostatic charge buildup or exposure of the assembly. Use only a grounded-tip soldering iron
to solder or unsolder ES devices. Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static” can generate
electrical charges sufficient to damage ES devices. Do not use freon-propelled chemicals which can generate electrical charge sufficient to damage ES
devices. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. Minimize bodily motions
when handling unpackaged replacement ES devices (Otherwise, seemingly harmless motion, such as the brushing together of your clothing or the lifting
of your foot from a carpeted floor, can generate static electricity sufficient to damage an ES device).
REGulATORY INFORMATION
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when the equipment is operated in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try
to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna; Increase the separation between the
equipment and receiver; Connect the equipment into an outlet on a circuit different from that to which the receiver is connected; Consult the dealer or
an experienced radio/TV technician for help.
The responsible party for this device’s compliance is:
LG Electronics of Alabama, Inc.
201 James Record Road
Huntsville, AL 35824, USA
Digital TV Hotline: [phone]

Directview LCD Training 3 Contents
TAblE OF CONTENTS
OVERVIEW....................................................................................................5
INTRODUCTION .................................................................................................... 5
COMPUTER CONNECTION ........................................................................................ 5
MODEL NUMBER STRUCTURE................................................................................... 5
SERIAL NUMBER STRUCTURE .................................................................................. 6
SERVICE MENU..................................................................................................... 6
SERVICE REMOTE .................................................................................................. 7
THEORY .......................................................................................................9
LIQUID CRYSTAL DISPLAY ...................................................................................... 9
LIQUID CRYSTAL PANEL ........................................................................................10
TROUBLESHOOTING - POWER ......................................................................... 11
POWER SUPPLY ...................................................................................................11
PSU CONNECTORS ................................................................................................11
PSU BALLAST CONNECTORS ...................................................................................12
PSU CONNECTORS - FULL LIST................................................................................13
IC DISTRIBUTION CHART ......................................................................................14
I2C BUS DATA CONTROL LINES................................................................................15
POWER SUPPLY FLOWCHART ..................................................................................16
TROUBLESHOOTING - VIDEO .......................................................................... 17
VIDEO BLOCK DIAGRAM........................................................................................17
NO VIDEO FLOWCHART .........................................................................................18
LCD CONTROL BOARD ...........................................................................................19
NO RF - VIDEO FLOWCHART...................................................................................21
NO RF - NTSC......................................................................................................22
NO RF - ATSC ......................................................................................................23
AV1/AV2 AUDIO..................................................................................................24
COMPOSITE VIDEO INPUT......................................................................................25
COMPONENT VIDEO INPUT ....................................................................................26
COMPONENT INPUT FLOWCHART.............................................................................27
RGB VIDEO INPUT ...............................................................................................28
HDMI SIGNAL PATH .............................................................................................29
COMPONENT/RGB FLOWCHART ...............................................................................30
DEFECTIVE VIDEO FLOWCHART ...............................................................................31
TROUBLESHOOTING - AUDIO.......................................................................... 32
AUDIO SIGNAL PATH............................................................................................32
NO AUDIO OUT FLOWCHART ..................................................................................33
NO RF SOUND .....................................................................................................34
NO RF SOUND FLOWCHART ....................................................................................35
NO DTV SOUND ...................................................................................................36
NO SOUND FROM INPUTS ......................................................................................37
NO HDMI SOUND.................................................................................................38
USB MEDIA DEVICE FLOWCHART.............................................................................39
DISASSEMBLY.............................................................................................. 40
EXPLODED VIEW..................................................................................................40
EXPLODED VIEW PARTS.........................................................................................41

- 4 -

Directview LCD Training 5 Overview
OVERVIEW
COMPuTER CONNECTION
A computer can be connected to the RGB (VGA) or HDMI connection
on the TV. The HDMI connection will require a DVI to HDMI adapter
if the PC has a DVI connector.
Set the monitor output resolution and vertical frequency on the PC
before connecting it to the TV. When using RGB (VGA), the TV input
will have to switched to the RGB input setting and changed from
RGB-DTV to RGB-PC, if necessary. The HDMI connection automatically
senses if the input is PC or TV and adjusts accordingly. The message
“OUT OF RANGE” will appear on the screen if the resoultion is not
supported. The most common supported resoultions are show in the
chart. REfer tot he owner’s manual for more resoultions.
MOdEl NuMbER STRuCTuRE
42lb4d
1366x768p Resolution
NTSC/ATSC/QAM Clear Tuners
LG Simple Link
HDMI x3
USB MediaHost
INTROduCTION
The 42LB4D is a HD LCD TV with integrated HD tuner. This
model will accept 1080p and downconvert it to 1080i.
Features include USB Media Host and SimpLink. USB Media
Host consists of a USB port on the back of the TV that supports
USB flash memory drives loaded with media or firmware for the
TV. SimpLink allows for control of other LG SimpLink products
via the HDMI connection.
All LCD TV models are module level repair in and out of
warranty. They are covered by a one year parts and labor
warranty. Refer to the last page of the owner’s manual for
more warranty information. For models under 30”, the Sevice
Level is Factory Service Repair. Larger models are Field Service.
Contact the Warranty department for more information.
OvERvIEW
Some PC Resolutions
Resolution Vertical
Frequency (Hz)
1024x768 60/70/75Hz
1280x768 60Hz
1360x768 60Hz
1280x1024 60/75Hz
1600x1200 60Hz
1920x1080 60Hz
New (2006) LG & Zenith Structure:
_ 4 2 L B 4 D _ - U A
Tuner
R= NTSC Tuner
D = ATSC Tuner
M = No tuner
Screen Size
Feature Level
C,F,J = Good
B,E,H = Better
A,D,G = Best
Series
Options
R = DVR
P = DVD
C = Commercial
H = High Altitude
Display Type
P = Plasma
L = LCD
M = LCD RPTV
D = DLP RPTV
S = LCoS RPTV
F = Flat CRT
N = CRT RPTV
J = Projector
C = Directview CRT
Brand
Z= Zenith
Blank = LG
Region
U = North America
B = Europe & NA
Chassis Version

Directview LCD Training 6 Overview
OVERVIEW
SERIAl NuMbER STRuCTuRE
123 45 67 891011121314
Sequential Number (XXXXXXX),
5to7digits (Number or Alphabet)
Production Line (VV) ,2digits (Alphabet)
Production Site (SS),2digits (Alphabet)
Last digitofYear and Month for Production (YMM),3digits (Number)
[Example] 403MXXQ05106
123 45 67 891011121314 -----14 digit format
403 MXXQ 0510 6 -------12digit format
05106: SequentialNumber
XQ: Production Line
MX: Production Site (producedatLGEMX in Mexico)
403: Last digitofYear and Month for Production (March 2004)
CALIBRATION MENU
Input
Pic. Mode
1. Contrast
2. Brightness
3. Color
4. Tint
5. Sharpness
6. R. Gain
7. G Gain
8. B Gain
9. R Offset
10. G Offset
11. B Offset
POS/SIZE ADJUST
1. H Position
2. V Position
3. H Size
4. V Size
Default Load
Count : 6
90
50
50
0
50
192
97
147
64
64
64
0
0
0
0
DTV
-
123
789
4 65
0FLASHBK
EXPERT MODE
Hold the MENU Key until
ENTER PASSWORD appears on the
screen, Press remote key sequence 8-7-4-1
A custom installer can calibrate the TV to the
viewing environment and the viewer’s
preferences then lock it in so the settings
cannot be altered without the code
SERvICE MENu
Note: Horizontal and Vertical controls only work with the TV, CTV, AV1, and AV2 sources.

Directview LCD Training 7 Overview
OVERVIEW
SERvICE REMOTE
NUM KEY FUNCTION
1 POWER To turn the TV on or off
2 POWER ON To turn the TV on automatically if the power is supplied to the TV. Use the POWER key to deactivate; It
should be deactivated when delivered.
3 MUTE To activate the mute function.
4 P-CHECK To check TV screen image easily.
5 S-CHECK To check TV screen sound easily
6 ARC To select size of the main screen (Normal, Spectacle, Wide or Zoom)
7 CAPTION Switch to closed caption broadcasting
8 TXT To toggle on/off the teletext mode
9 TV/AV To select an external input for the TV screen
10 TURBO SOUND To start turbo sound
11 TURBO PICTURE To start turbo picture
12 IN-START To enter adjustment mode when manufacturing the TV sets.
To adjust the screen voltage (automatic): In-start mute Adjust AV (Enter into W/B adjustment mode).
W/B adjustment (automatic): After adjusting the screen W/B adjustment Exit two times
13 ADJ To enter into the adjustment mode. To adjust horizontal line and sub-brightness.
14 MPX To select the multiple sound mode (Mono, Stereo or Foreign language).
15 EXIT To release the adjustment mode.
16 APC(PSM) To easily adjust the screen according to surrounding brightness.
17 ASC(SSM) To easily adjust sound according to the program type.
18 MULTIMIDIA To check component input.
19 FRONT-AV To check the front AV.
20 CH To move channel up/down or to select a function displayed on the screen.
21 VOL To adjust the volume or accurately control a specic function.
22 ENTER To set a specic function or complete setting.
23 PIP CH-(OP1) To move the channel down in the PIP screen. To use as a red key in the teletext mode.
24 PIP CH+(OP2) To move the channel in the PIP screen. To use as a green key in the teletext mode.
25 PIP SWAP(OP3) To switch between the main and sub screens. To use as a yellow key in the teletext mode.
26 PIP INPUT(OP4) To select the input status in the PIP screen. To use as a blue key in the teletext mode.
27 EYE To set a function that will automatically adjust screen status to match. The surrounding brightness so natural
color can be displayed.
28 MENU To select the functions such as video, voice, function or channel.
29 IN-STOP To set the delivery condition status after manufacturing the TV set.
30 STILL To halt the main screen in the normal mode, or the sub screen at the PIP screen. Used as a hold key in the
teletext mode. Page updating is stopped.
31 TIME Displays the teletext time in the normal mode. Enables to select the sub code in the teletext mode.
32 SIZE Used as the size key in the PIP screen in the normal mode. Used as the size key in the teletext mode.
33 MULTI PIP Used as the index key in the teletext mode. Top index will be displayed if it is the top text.
34 POSITION To select the position of the PIP screen in the normal mode. Used as the update key in the teletext mode
(Text will be displayed if the current page is updated.)
35 MODE Used as Mode in the teletext mode.
36 PIP To select the simultaneous screen.
37 TILT To adjust screen tilt.
38 0~9 To manually select the channel.

- 8 -

Directview LCD Training 9 Theory
THEORY
ThEORY
This section covers how an LCD Display works.
lIquId CRYSTAl dISPlAY
A Liquid Crystal Display is composed of a light source
(backlight), a Liquid Crystal Panel, and a driving circuit. We
start with a light source at the back of the panel composed of
thin fluorescent bulbs (CCFLs - Cold Cathode Flouresent Lamps).
This light passes through filters to help create a uniform light
source. Then the light passes through the Liquid Crystal Panel
which is composed of thousands of pixels that control the flow
of light throught the panel to make images.
Data Driver IC
Printed Circuit Board
Gate Driver IC
Inverter
Driving
Circuit
Power Supply
for Video Signal
Pixel Array & Wiring
Liquid Crystal
Panel
Polarizer
CF Panel
Liquid Crystal
TFT Panel
Lamp
Prism
Diffuser
Light Guide
Backlight Unit
Polarizer
Reflector
Inverter
Polarizer
TFT&Electrode
Color Filters
Top Electrode
Polarizer
Back Light
Liquid Crystals
Liquid Crystal Panel
Frame
Prism
Diffusers
Reflector
Light Guide
An LCD panel from a 15” LCD TV.

Directview LCD Training 10 Theory
THEORY
TFT Element
Pixel Electrode
(Transparent)
Insulator
Semi-conductor
Source Gate Drain
Glass Panel
Data Line
Gate Line
Pixel Electrode
Liquid Crystal
Common Electrode
Color Filter
Polarizer
Polarizer
Transistor
lIquId CRYSTAl PANEl
Below (on the left) is a cross section of a liquid crystal panel. The key to an LCD’s operation is the
polarizers. The polarizers only allow a certain wavelength of light to pass through. The two polarizers
are mounted at a 90 degree angle with respect to each other, which prevents light from passing through.
The liquid crystals are used to twist the light beam 90 degrees and allow light to pass through that
cell. Color comes from a simple light filter.
Each sub-pixel or cell (a red, green, and blue sub-pixel equals one
pixel) is controlled by a Thin Film Transistor (TFT). This provides
accurate control of each cell and makes for an accurate picture.
Some methods used in the past that didn’t involve a switch and
current could leak to surrounding cells resulting in a blurred image.
A TFT is a semiconductor (bottom-right picture), it behaves like a
relay switch.

Directview LCD Training 11 Troubleshooting
POWER
TROUBLESHOOTING
TROublEShOOTING - POWER
POWER SuPPlY
PSu CONNECTORS
2.5V0V3.4V on13
0V0VGND12
6.110V6V11
3.2V0VDIM10
0V0VGND9
5V5V5Vs8
2.7530.22VBRI7
3.2V0VERR6
3.2V0VI-C5
0V0VGND4
5V5V5Vs3
3.0V0VVon2
5V5VACD1
P201 RunStandby
Connector
0V0VGND10
11.990V129
0V0VGND8
3.460V3.47
0V0VGND6
6.110V65
0V0VGND4
0V0VGND3
18.860V192
18.860V191
P202 Run
Stan
dby
Connector

Directview LCD Training 12 Troubleshooting
POWER
TROUBLESHOOTING
PSu bAllAST CONNECTORS
3.23V0VVon/Off - 3.2Vdc12
3.27V0VADIM - 3.2Vdc11
0V0VGND10
0V0VGND9
0V0VGND8
0V0VGND7
0V0VGND6
23.93V0VVBL - +24.12VDC5
23.93V0VVBL - +24.12VDC4
23.93V0VVBL - +24.12VDC3
23.93V0VVBL - +24.12VDC2
23.93V0VVBL - +24.12VDC1
RUN modeStandbyLabelP205
BALLAST / INVERTER
2.75V0VVBR- +2.7Vdc13
3.23V0VVon/Off - 3.2Vdc12
3.27V0VADIM - 3.2Vdc11
0V0VGND10
0V0VGND9
0V0VGND8
0V0VGND7
0V0VGND6
23.93V0VVBL - +24.12VDC5
23.93V0VVBL - +24.12VDC4
23.93V0VVBL - +24.12VDC3
23.93V0VVBL - +24.12VDC2
23.93V0VVBL - +24.12VDC1
Run ModeStandbyLabelP204
BALLAST / INVERTER

Directview LCD Training 13 Troubleshooting
POWER
TROUBLESHOOTING
PSu CONNECTORS - Full lIST
Resistance Measurements, Pin to common ground.
1 KOhm*24V1.2 KOhm*24V 1 KOhm*24V1.2 KOhm*24V 1 KOhm*24V1.2 KOhm*24V 1 KOhm*24V1.2 KOhm*24V 1 KOhm*24V1.2 KOhm*24V 0GND0GND 0GND0GND 0GND0GND 0GND0GND 0GND0GND c
BRT CTRL1 KOhmBRT CNTRL
c
INV. CTRL93.4 KOhmINV. CNTRL
10.9 KOhm3.4V_ON10.9 KOhm3.4V_ON
0GND
0GND0GND0GND
0GND
1.3 KOhm*6V0GND1.3 KOhm*6V
1 KOhm*12V
0GND
c
PWR_DN1 KOhm*12V0GND5.5 KOhmPWR_DN
1 KOhm*12V
.7 KOhm*12V0GND1 KOhm*12V.7 KOhm*12V0GND
0GND
0GND5.5 MOhm*5V_STB0GND0GND4 MOhm*5V_STB
0GND
1 KOhm*3.4V
c
BT_CNTRL0GND1 KOhm*3.4V99.7 KOhmBT_CNTRL
1 KOhm*6V
0GND
c
ERR_OUT1 KOhm*6V0GND
c
ERR_OUT
1 KOhm*6V
1.3 KOhm*8V
c
INV_CTRL1 KOhm*6V1 KOhm*8V93.4 KOhmINV_CTRL
0GND
0GND0GND0GND0GND0GND
0GND
0GND8 MOhm*STB0GND0GND7 MOhm*STB
1 KOhm*3.4V
2 KOhm*19V
?
PWR_NF
1 KOhm*3.4V1.7 KOhm*19V
c
PWR_NF
1 KOhm*3.4V
2 KOhm*19V
c
AC_DET1 KOhm*3.4V1.7 KOhm*19V100.7 KOhmAC_DET
P200
P201P202P200P201P202
Resistances with Board Disconnected
Resistances with Board Connected
47LB1DA POWER SUPPLY
* Resistance reading when capacitors are fully charged

Directview LCD Training 14 Troubleshooting
POWER
TROUBLESHOOTING
IC dISTRIbuTION ChART
+12.0V
+12.0V
+6.0V
+6.0V
CS4344
CS4344 CS5340
CS5340
PQ05DZ1U
PQ05DZ1U
KIA78R09
KIA78R09 FAN1
FAN1 KIA78R09
KIA78R09 FAN2, 3
FAN2, 3
MC33078
MC33078
X260
X260
HYB18T512(4EA)
HYB18T512(4EA)
AZ1117H -1.8
AZ1117H -1.8 LM75
LM75
ICL3232CBNZ
ICL3232CBNZ
+5.0VST
+5.0VST
+3.3V_L
+3.3V_L
AT/NT Tuner
AT/NT Tuner
+5V_L
+5.0V
SI3865
SI3865
PQ05DZ1U
PQ05DZ1U
Standby Power Run Power
Live -on
AZ1117H -3.3
AZ1117H -3.3 LGDT3703(MAIN)
LGDT3703(MAIN)
SC1565 -1.8
SC1565-1.8 ISL6549CB
ISL6549CB
1.2V
1.8V
ISL6549CB
ISL6549CB
1.8V
MK3727D
MK3727D 74LVT16373(2EA)
74LVT16373(2EA) S29GL256
S29GL256
THC63LVD1023
THC63LVD1023
+3.3V_L
HYB18T512(4EA)
HYB18T512(4EA) MK3727D
MK3727D
+19.0V
+19.0V
NTP3000
NTP3000
NTP3000
NTP3000
1.8V
BA033FP -3.3
BA033FP -3.3 MTV416
MTV416
AZ1086 -1.8
AZ1086 -1.8
AZ1117H -3.3
AZ1117H-3.3
SC1565 -2.5
SC1565 -2.5
MST3369
MST3369
9.0V
TEA6420
TEA6420
9.0V
CS8416
CS8416
KIA78R09
KIA78R09
MK3727D
MK3727D
MIC2505
MIC2505
3.3VST_MICOM
24C08
24C08
FRC94XYH
FRC94XYH
Live -on
24C512
24C512
STMAV335
STMAV335
ISP1504
ISP1504
MIC2505
MIC2505
KIA7805
KIA7805
AZ1085S -3.3
AZ1085S - 3.3
AZ1085S -1.8
AZ1085S -1.8 24C16
24C16
FRC
FRC
SC1565 -2.6
SC1565 -2.6 MIC3910 -2.5
MIC3910-2.5
SC1592 -1.0
SC1592 -1.0
12.0V
HY5DU281622
HY5DU281622
SC2595 -1.0
SC2595 -1.0

Directview LCD Training 15 Troubleshooting
POWER
TROUBLESHOOTING
I2C buS dATA CONTROl lINES
ATI
(X260)
I2C Master
AT/NT Tuner
0xC2
HDMI
ADC
(MST3361)
0X9C
Temp.
Sensor
(LM75)
0X94
U-Com
(MTV416)
0x50
I2C_CH1 (+3.3V_L & +5V_L)
I2C_CH2 (+3.3V_L & +5V_L)
I2C_CH3 (+3.3V_L)
Port
Expander (M62320)
0X74
Audio
Switch
(MSP4450K)
0X80
DASP
(NTP3000)
0X54
PDP Module
0x1C
VSB/QAM
(LGDT3703)
Main
0X1C
Live Dead
CS8416A
0X20(W)
0X21(R)
EEPROM
(24LC512)
0xA6
CH1 CH2 CH3
FRC94XYH
0xD4
EEPROM
(24LC16)
5V
5V 5V
2.5V

Directview LCD Training 16 Troubleshooting
POWER
TROUBLESHOOTING
POWER SuPPlY FlOWChART
Check X500 (18.43MHz)
Normal?
Re-download
MTV416GMF (IC309 )
Normal?
YES
NO
Replace MTV416GMF (IC309 )
and Re-download
Check SI3865( MAIN PCB)
(Q702) pin 2,3
5V Normal?
Replace Power board
Check P702 (MAIN PCB)
are all input
voltages Normal ?
YES
Check SI3865
(Q702) Pin #5 2.5V
Normal?
NO NO Check P702 wafers
& Connectors
Normal ?
YES
Check P701(MAIN PCB)
Pin #3,8
5V Normal ?
YES
Replace power board
NO
Replace SI3865(Q702)
YES
NO
NO
YES

Directview LCD Training 17 Troubleshooting
VidEO
TROUBLESHOOTING
TROublEShOOTING - vIdEO
vIdEO blOCk dIAGRAM
M_SIF
NTP3000
I2S
SPDIF
I2S
CVBS(NT Main)
DDR2
64MBx2
Flex Bus
RGB 30bit
TP
A
Analog
Front
End USB 1.1
I2C Port0
I2C CH1 I2C CH2 I2C CH3
USB (upgrade ready!!)
Inactive IC when in
Standby Mode
Video
Scaler
0
Video
Scaler
1 or 2
Active IC when in
Standby mode Audio
Video
TP
AV2 L/R
MNT Out L/R
COMP1 L/R COMP2 L/R
RGB L/R
TP_IN1
AV1 AV2
AV1, Y/C1
AV2, Y/C2
Flash
(NOR 32MB)
Latchx2
24C512
Cable
VSB
LGDT3303
63LVD1023
1080P
LVDS
Con.
Dual
AV1 L/R
GPIO
I2S
ATI
X260
MPEG decoder
COMP2
RGB
CS8416
HDMI SPDIF
I2S
I2S
MST3361
1HDMI +
1ADC
RGB
HDMI1/2/3
SPDIF
SPDIF
Opt.
FRC94xyH
DDR1
16MB
RGB odd
RGB even
120Hz
TPB
USB 1.1 USB(EMF)
PCI
3:1
Demux
Air
MTV415
Micom 24C16
3:1
Demux
MSP4450K
I2S
AT/NT
SIF

Directview LCD Training 18 Troubleshooting
VidEO
TROUBLESHOOTING
NO vIdEO FlOWChART
Check L729(2.5V) Check
Power connector Replace Power board
Check THC63LVD1023
(IC601)#9(DE),
#15(Clk),
#7(Hsync),#8(Vsync)
Check X260 (IC101)
Check P600
#47(DISP_EN),
#33(TXAC- ) ,
#32(TXAC+) ,
#17(TXBC- ) ,
#16(TXBC+)
Check THC63LVD1023
(IC601)
Check LVDS Cable
Check PDP/LCD
Module
Control board
1 2 3 4 5
Y
N Y
Y Y Y
N N
LVDS Transmitter
#47(DISP_EN) 3.3V
GND
#33 (TXAC) : #32 (TXAC+) #17 (TXBC : #16 (TXBC+)
74.25MHz 74.25MHz 74.25MHz 74.25MHz
#(Clk) 74.25MHz

Directview LCD Training 19 Troubleshooting
VidEO
TROUBLESHOOTING
lCd CONTROl bOARd
Video Data to LCD Panel.
Test points From LCD control board
Video Data to LCD Panel.
Test points From LCD
control board

Directview LCD Training 20 Troubleshooting
VidEO
TROUBLESHOOTING
Check: Video data from LVDS Transmitter (IC601). The diagram shown, points out the test points
for the Video Data transmitted to the LCD Control PCB. Points highlighted are above the LVDS cable
connection