LG 37LB4DS User manual

R
LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LA73A
MODEL : 37LB4DS 37LB4DS-UA
42LB4DS 42LB4DS-UA

- 2 -
CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
SPECIFICATION ........................................................................................6
ADJUSTMENT INSTRUCTION ...............................................................13
TROUBLE SHOOTING & BLOCK DIAGRAM ........................................18
EXPLODED VIEW .................................................................................. 44
REPLACEMENT PARTS LIST ............................................................... 48
SVC. SHEET ...............................................................................................

- 3 -
SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An isolation 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 as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1W), keep the resistor 10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
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.
Leakage Current Cold Check(Antenna Cold Check)
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.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
1.5 Kohm/10W
To Instrument's
exposed 
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
IMPORTANT SAFETY NOTICE
0.15uF

- 4 -
CAUTION: Before servicing receivers covered by this service
manual and its supplements and addenda, read and follow the
SAFETY PRECAUTIONS on page 3 of this publication.
NOTE: If unforeseen circumstances create conflict between the
following servicing precautions and any of the safety precautions on
page 3 of this publication, always follow the safety precautions.
Remember: Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power
source before;
a. Removing or reinstalling any component, circuit board
module or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical plug or
other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an
explosion hazard.
2. Test high voltage only by measuring it with an appropriate high
voltage meter or other voltage measuring device (DVM,
FETVOM, etc) equipped with a suitable high voltage probe.
Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of its
assemblies.
4. Unless specified otherwise in this service manual, clean
electrical contacts only by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable
non-abrasive applicator; 10% (by volume) Acetone and 90% (by
volume) isopropyl alcohol (90%-99% strength)
CAUTION: This is a flammable mixture.
Unless specified otherwise in this service manual, lubrication of
contacts in not required.
5. Do not defeat any plug/socket B+ voltage interlocks with which
receivers covered by this service manual might be equipped.
6. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid-state device heat sinks are
correctly installed.
7. Always connect the test receiver ground lead to the receiver
chassis ground before connecting the test receiver positive
lead.
Always remove the test receiver ground lead last.
8. Use with this receiver only the test fixtures specified in this
service manual.
CAUTION: Do not connect the test fixture ground strap to any
heat sink in this receiver.
Electrostatically Sensitive (ES) 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 by static electricity.
1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic
charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed to
prevent potential shock reasons prior to applying power to the
unit under test.
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES
devices.
4. Use only an anti-static type solder removal device. Some solder
removal devices not classified as "anti-static" can generate
electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, aluminum foil
or comparable conductive material).
7. Immediately before removing the protective material from the
leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be
installed.
CAUTION: Be sure no power is applied to the chassis or circuit,
and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Otherwise harmless motion such as
the brushing together of your clothes fabric or the lifting of your
foot from a carpeted floor can generate static electricity
sufficient to damage an ES device.)
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and appropriate
tip size and shape that will maintain tip temperature within the
range or 500 F to 600 F.
2. Use an appropriate gauge of RMA resin-core solder composed
of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
bristle (0.5 inch, or 1.25cm) brush with a metal handle.
Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature.
(500 F to 600 F)
b. Heat the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static, suction-
type solder removal device or with solder braid.
CAUTION: Work quickly to avoid overheating the
circuitboard printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
(500 F to 600 F)
b. First, hold the soldering iron tip and solder the strand against
the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it there
only until the solder flows onto and around both the
component lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
d. Closely inspect the solder area and remove any excess or
splashed solder with a small wire-bristle brush.
SERVICING PRECAUTIONS

- 5 -
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by gently
prying up on the lead with the soldering iron tip as the solder
melts.
2. Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing the
IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close as
possible to the component body.
2. Bend into a "U" shape the end of each of three leads remaining
on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
possible to diode body.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed whenever
this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC
connections).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the good
copper pattern. Solder the overlapped area and clip off any
excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern
break and locate the nearest component that is directly
connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the lead
of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.

- 6 -
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
4. General Specification(TV)
No. Item Specification Remark
1. Receiving System ATSC/64 & 256 QAM/ NTSC-M
2. Available Channel 1) VHF : 02~13
2) UHF : 14~69
3) DTV : 02-69
4) CATV : 01~135
5) CADTV : 01~135
3. Input Voltage 1) AC 100 ~ 240V 50/60Hz
4. Market NORTH AMERICA
5. Screen Size 37 inch Wide(1366 x 768) 37LB4DS
42 inch Wide(1366 x 768) 42LB4DS
6. Aspect Ratio 16:9
7. Tuning System FS
8. LCD Module LC370WX2-SLD1 37LB4DS
LC420WX4-SLA1 42LB4DS
9. Operating Environment 1) Temp : 0 ~ 40 deg
2) Humidity : ~ 80 %
10. Storage Environment 1) Temp : -20 ~ 60 deg
2) Humidity : ~ 85 %
1. Application Range.
This spec sheet is applied to the 37"/42" LCD TV used LA73A
chassis.
2. Especificación
Each part is tested as below without special appointment
2.1 Temperature : 25±5°C(77±9°F), CST : 40±5°C
2.2 Relative Humidity : 65±10%
2.3 Power Voltage : Standard input voltage
(100~240V@ 50/60Hz)
• Standard Voltage of each products is marked by models
2.4 Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM .
2.5 The receiver must be operated for about 20 minutes prior
to the adjustment.
3. Test method
3.1 Performance : LGE TV test method followed.
3.2 Demanded other specification
Safety : UL, CSA, IEC specification
3.3 EMC : FCC, ICES, IEC specification

- 7 -
5. Chrominance & Luminance Specification
No Item Min Typ Max Unit Remark
1. White peak brightness 400 500 cd/m237LB4DS
cd/m242LB4DS
2. Contrast ratio cd/m2N/A
3. Brightness uniformity 80 % Full white
4. Color coordinate RED X 0.638 +/- 0.03
Y0.340 +/- 0.03
GREEN X 0.279 +/- 0.03
Y0.611 +/- 0.03
BLUE X 0.146 +/- 0.03
Y0.062 +/- 0.03
WHITE X 0.272 +/- 0.03
Y0.278 +/- 0.03
5. Color coordinate uniformity N/A
6. Contrast ratio 800:1 1000:1 37LB4DS
800:1 1000:1 42LB4DS
7. Color Temperature Cool 11,000 <Test Signal>
Medium 9,300
HDMI input, With 16-gray pattern
Warm 6,500 6th bar from right
8. Color Distortion, DG 10.0 %
9. Color Distortion, DP 10.0 deg
10. Color S/N, AM/FM 43.0 dB
11. Color Killer Sensitivity -80 dBm

- 8 -
Peak & average Brightness & Contrast measure standard specification
- White Peak brightness measure specification
1) In non-impressed condition, measure peak brightness displayable as much as possible LCD module.
2) Measuring instrument: CA-110 or a sort of Color Analyzer.
3) Pattern Generator : VG-828 or a sort of digital pattern generator (displayable Full White & 1/25 White Window pattern)
4) Measure condition
- Test pattern: in center, 1/5(H)x1/5(V) of Window Pattern (white pattern in non-impressed condition)
- SET condition : Contrast & Brightness Level 100%
- Environment condition : Dark room in the non outside light
- Video menu option condition
5) Measurement
- Do heat-run LCD module at 30minutes in normal temperature (25°C) by using full white pattern of 15% signal level(38 gray
level).
- Impress test pattern signal in 1/5(H)x1/5(V) White Window of 100%(255Gray Level)
- measure 3 times brightness of central white window, and mark peak brightness in max brightness degree
- measure the same condition in video signal /RGB signal.
Average Brightness measure specification
1) Impress 100%(255Gray Level) full white pattern at the same peak brightness measurement.
2) Measure average brightness in 9 points.
Contrast ratio measure specification
1) Test display signal : 30x30 dots White Window signal & all Black Raster signal
2) Dark room measure condition : Using touch type Color analyzer CA-100 Dark room in the non outside light
3) Bright room measure condition : In bright room of 150Lx illumination in the panel surface, locate a source of light on the above
45°of the panel surface.
4) Measure method
- In standard test condition, impress 30x30 dots White Window Pattern signal .
Measure center peak brightness degree Lw of white window
- Impress black Raster signal as contrast ratio measurement signal.
Measure black brightness degree Lb of PDP central
Calculate the following numerical formula.
Contrast ratio = Lw / Lb
* If it does not use Prior measurement, use generally simple test measurement.
The Correct measure specification is followed by IEC61988-2/CD, JAPAN EIAJ-2710
Signal Picture Mode XD Black Level
RF NTSC-M USER1 Off N/A
AV NTSC-M USER1 Off Low
Component 720P USER1 Off N/A
RGB 1024x768 USER1 N/A N/A
HDMI DTV 720P USER1 Off High
1 4 7
2 5 8
3 6 9

- 9 -
6. Component Video Input (Y, PB, PR)
No. Specification Remark
Resolution H-freq(kHz) V-freq(Hz)
1. 720*480 15.73 60 SDTV ,DVD 480I
2. 720*480 15.73 59.94 SDTV ,DVD 480I
3. 720*480 31.47 60 SDTV 480P
4. 720*480 31.47 59.94 SDTV 480P
5. 1280*720 45.00 60.00 HDTV 720P
6. 1280*720 44.96 59.94 HDTV 720P
7. 1920*1080 33.75 60.00 HDTV 1080I
8. 1920*1080 33.72 59.94 HDTV 1080I
9. 1920*1080 67.500 60 HDTV 1080P
10. 1920*1080 67.432 59.939 HDTV 1080P
11. 1920*1080 27.000 24.000 HDTV 1080P
12. 1920*1080 26.97 23.94 HDTV 1080P
13. 1920*1080 33.75 30.000 HDTV 1080P
14. 1920*1080 33.71 29.97 HDTV 1080P
7. RGB PC
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Remark
PC DDC
1. 640*350 31.468 70.09 25.17 EGA X
2. 720*400 31.469 70.08 28.32 DOS O
3. 640*480 31.469 59.94 25.17 VESA(VGA) O
4. 640*480 37.861 72.80 31.50 VESA(VGA) O
5. 640*480 37.500 75.00 31.50 VESA(VGA) O
6. 800*600 35.156 56.25 36.00 VESA(SVGA) O
7. 800*600 37.879 60.31 40.00 VESA(SVGA) O
8. 800*600 48.077 72.18 50.00 VESA(SVGA) O
9. 800*600 46.875 75.00 49.50 VESA(SVGA) O
10. 1024*768 48.363 60.00 65.00 VESA(XGA) O
11. 1024*768 56.476 70.06 75.00 VESA(XGA) O
12. 1024*768 60.023 75.02 78.75 VESA(XGA) O
13. 1280*768 47.776 59.870 79.5 CVT(WXGA) O
14. 1280*768 60.289 74.893 102.25 CVT(WXGA) O
15. 1360*768 47.712 60.015 85.50 VESA (WXGA) O
16. 1280*1024 63.981 60.020 108.00 VESA (SXGA) O
17. 1280*1024 79.976 75.025 135 VESA (SXGA) O
18. 1600*1200 75.00 60.00 162 VESA (UXGA) O
19 1920*1080 67.5 60 148.5 HDTV 1080P O

- 10 -
8. HDMI Input (PC/DTV)
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Remark
PC DDC
1640*350 31.468 70.09 25.17 EGA X
2720*400 31.469 70.08 28.32 DOS _
3640*480 31.469 59.94 25.17 VESA(VGA) _
4640*480 37.861 72.80 31.50 VESA(VGA) _
5640*480 37.500 75.00 31.50 VESA(VGA) _
6800*600 35.156 56.25 36.00 VESA(SVGA) _
7800*600 37.879 60.31 40.00 VESA(SVGA) _
8800*600 48.077 72.18 50.00 VESA(SVGA) _
9800*600 46.875 75.00 49.50 VESA(SVGA) _
10 1024*768 48.363 60.00 65.00 VESA(XGA) _
11 1024*768 56.476 70.06 75.00 VESA(XGA) _
12 1024*768 60.023 75.02 78.75 VESA(XGA) _
13 1280*768 47.776 59.870 79.5 CVT(WXGA) _
14 1360*768 47.712 60.015 85.50 VESA (WXGA) _
15 1280*1024 63.981 60.020 108.00 VESA (SXGA) _
16 1280*1024 79.976 75.025 135 VESA (SXGA) _
17 1600*1200 75.00 60.00 162 VESA (UXGA) _
18 1920*1080 67.5 60 148.5 HDTV 1080P _
DTV
1720*480 31.47 60 SDTV 480P
2720*480 31.47 59.94 SDTV 480P
31280*720 45.00 60.00 HDTV 720P
41280*720 44.96 59.94 HDTV 720P
51920*1080 33.75 60.00 HDTV 1080I
61920*1080 33.72 59.94 HDTV 1080I
71920*1080 67.500 60 HDTV 1080P
81920*1080 67.432 59.939 HDTV 1080P
91920*1080 27.000 24.000 HDTV 1080P
10 1920*1080 26.97 23.94 HDTV 1080P
11 1920*1080 33.75 30.000 HDTV 1080P
12 1920*1080 33.71 29.97 HDTV 1080P

- 11 -
9. General specifications
9-1. 42" LCD MODULE
9-2. 37" LCD MODULE
No Item Specification Unit Remark
1Active Screen Size 42.02 inches(1067.308mm) mm
2Outline dimension 983.0(H)x576.0(V)x51.0(D) mm
3Pixel Pitch 0.227x0.681x RGB mm
4Pixel Format 1366 horiz by 768 vert. RGB Stripe arrangement
5Color Depth 8-bit / 16.7M Color, 10-bit / 1 Billion colors
6Luminance, White 500 cd/m2 (Center 1 point, Typ) kg
7Power Consumption Total 183.3 Watt(Typ)
8Weight 14.5Kg
9Display Operating Mode Transmissive Mode, Normally Black
10 Surface Treatment
Hard Coating (3H), Anti-glare treatment of the front polarizer
No Item Specification Unit Remark
1Active Screen Size 37.02 inches(940.3mm) mm
2Outline dimension 877.0(H)x516.8(V)x55.5(D) mm
3Pixel Pitch 0.200 x 0.600 x RGB mm
4Pixel Format 1366 horiz by 768 vert. RGB Stripe arrangement
5Color Depth 8-bit / 16.7M Color, 10-bit / 1 G colors
6Luminance, White 500 cd/m2 kg
7Power Consumption Total TDB Watt
8Weight 9.5Kg
9Display Operating Mode Transmissive Mode, Normally Black
10 Surface Treatment
Hard Coating (3H), Anti-glare treatment of the front polarizer
10. Mechanical specification
10-1. 42LB4DS
No. Item Content Unit Remark
1. Product Widt(W) Length(D) Height(H) mm
Dimension Before Packing 1032.7 287.6 750 mm
After Packing 1119 374 858 mm
2. Product Only SET 27.1 Kg
With BOX 32.5 Kg
10-2. 37LB4DS
No. Item Content Unit Remark
1. Product Widt(W) Length(D) Height(H) mm
Dimension Before Packing 926.6 284.4 697.6 mm With Stant
926.6 88.0 635.6 mm W/O Stand
After Packing 1119 374 858 mm
2. Product Only SET 20.0 Kg With Stant
16.3 Kg W/O Stand
With BOX 25.0 Kg

- 12 -
9. Customer Menu Setup (Shipment Condition)
No Item Condition Remark
1. Input Mode TV02CH
2. Volume Level 30
3. Mute Off
4. Aspect Ratio 16:9
5. Video EZ Picture Daylight
Contrast 100
Brightness 40
Color 70
Sharpness 70
Tint 0
Color-temperature Cool
XD Auto(On)
Advanced Cinema3:2 Mode(Off)
Black Level(RF,HDMI=>Low),(AV=>High)( RGB-PC,Component=>Disable)
6. Audio Audio Language Off
EZ Sound Normal
Balance 0
Bass 50
Front Surround Off
TV Speaker On
7. Timer Auto clock Off
Manual Clock Off
Off Timer Off
On Timer Off
Sleep Timer Off
Auto Off Off
8. Option Aspect Ratio 16:9
Caption/Text Off
Caption Option Set By Program
Language English
Simplink On
9. Lock Lock System Off
Set password On
(Default:0000)
Block channel None
Movie Rating Off
TV Rating-Children None
TV Rating-General None
Input Block Off
10. Channel Memory RF : 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 30, 51, 63
CATV : 15, 16, 17

- 13 -
ADJUSTMENT INSTRUCTION
1. Scope
These instructions are applied to all of the LCD TV, LA73A
Chassis.
2. Designation
2.1 Because this chassis is a non-charge type chassis of
power supply insulation, it does not require an insulation
type transformer. But it is preferable to use an insulation
type transformer between the power supply line and the
chassis input side to operate it before the adjustment.
2.2 The adjustment must be done in the accurate order. But it
can be changed considering the mass production
capability.
2.3 Unless specified specially, the adjustment must be done
in an environment with the surrounding temperature of 25
±5°C and relative humidity of 65 ±10%.
2.4 The input voltage of the receiver during the adjustment
must be maintained at 220V, 60Hz.
2.5 Unless specified otherwise, the receiver must be pre-
operated for 15 minutes before the adjustment.
OThe pre-operation must be done after receiving 100%
White Pattern (06CH).
(Or 8. Test Pattern condition of Ez – Adjust)
O How to enter White Pattern
A. Press the POWER ON KEY on the adjustment R/C.
B. Or press the ADJ KEY on the adjustment R/C to enter
Ez – Adjust
And select 10. Test Pattern using the CH + / - KEY
and then select White using the arrow keys to display
the 100% FULL WHITE PATTERN.
* In this mode, you can heat run the set without separate
signal generator.
Caution) When you keep the still screen on for more than 20
minutes (Especially for internal Digital pattern (13
CH), Cross Hatch Pattern (09CH) with higher
black/white contrast), be careful not to create
residual image on the black level part.
3. Board adjustment
- Adjust 480i Comp1
- Adjust 1080p Comp1/RGB
- Adjust RF and Video
4. Adjustment method using RS-232C
Adjust the 3 board adjustment items of 3 using the RS-232C
according to the "4.1.2 Adjustment order".
4-1. Necessary details before adjustment
- ad 00 00 Enter ADC adjustment mode.
- kb 00 01 Switch RF input (Input is not switched)
- ad 00 10 Adjust RF and Video (Input is switched and
adjusted)
- kb 00 04 Switch component1 input (Input is not switched)
- ad 00 10 Adjust 480i Comp1 (Input is switched and adjusted)
- kb 00 06 Switch RGB-DTV input (Actual input is not switched)
- ad 00 10 Adjust 1080p Comp1/RGB (Input is switched and
adjusted)
- ad 00 90 Complete adjustment
4-2. Auto adjustment of RF and Video
4.2.1 Introduction
This is the adjustment to reduce the color difference of
main/sub screen of RF and video signal.
4.2.2 Adjustment method
A. Connect the Video Signal Generator (Master) to TV AV
input terminal with AV output.
At this time, when you enter the input pattern as Model :
201(NTSC-M) , Pattern : 33(100% color Bar), the following
video is displayed on the screen
Note: When the video is shown as follows showing black patterns
from the left, it cannot be adjusted
Model: 201(NTSC-M), Pattern: 33(100% color Bar)

- 14 -
In this case, first press the Rev button of Video Signal
Generator (Master), to generate the white pattern to be displayed
from the left.
Because the above pattern can differ by the model and pattern
for each device, you must check the pattern first.
B. When the receiving signal is confirmed after inputting the
internal signal, press the ADJ KEY on the adjustment R/C
to enter ‘EZ-ADJUST’. Select ‘5.Adjust RF and Video’ and
press the right key (G) to enter the adjustment mode.
C. When you enter the adjustment mode, the video is
automatically set to TV 2CH and the following window is
displayed.
D. When the adjustment is completed, a message saying ‘RF
Configuration Success’ is displayed. If the adjustment has
failed, a message saying ‘RF Configuration Error’ is
displayed.
E. When the automatic adjustment of RF signal is completed,
it is automatically switched to the Video Mode as shown in
the above picture, and automatic adjustment for Video
Mode is done. When the automatic adjustment is
completed, a message saying ‘Video Configuration
Success’ is displayed. If the adjustment has failed, a
message saying ‘Video Configuration Error’ is displayed..
O Check RS-232C operation
Press the Instart of adjustment R/C to enter the 7.Baud Rate
menu and set the Baud Rate to 115200 to check the 232-C
operation
5. Automatic adjustment of Component
480i/1080p RGB 1080p
5.1 Introduction
The Component 480i/1080p RGB 1080p adjustment sets the
optimal black level and gain automatically from the analog =>
digital converter, and is the function to correct the RGB
deviation
5.2 Using device
Adjustment remote controller, 801GF (802B, 802F, 802R) or
MSPG925FA Pattern Generator
(480i/1080P Horizontal 100% Color Bar Pattern output must
be possible and output level must be adjusted accurately to
0.7±0.1Vp-p.)
Because the above pattern can differ by the model and pattern
for each device, you must check the pattern first.
(Adjustment pattern : 480i / 1080P 60Hz Pattern)

- 15 -
5.3 480i Comp1, 1080p Comp1/RGB adjustment
method
A. ADC 480i component1 adjustment
- Check Component1 connected condition from the using
device.
- (MSPG-925FA : (model :209 , pattern :65 )
B. Input Component 100% Horizontal Color Bar Pattern
(HozTV31Bar) of 480i Mode that is supported, select the input
to Component1 and select the video to ‘Normal’.
C. Wait for more than 1 second after receiving the signal and
then press the ADJ KEY on the adjustment R/C to enter ‘Ez –
Adjust’. Select ‘3. ADC 480i Comp1’ and press the Enter KEY
to make the automatic adjustment.
D. When the adjustment is normally completed, a message
saying "ADC Component1 Success" is displayed.
E. When the adjustment is not normally completed, a message
saying ‘ADC Component1 480i Fail’ is displayed. When the
component is not connected, a message saying ‘Component1
Not Connected’, when the input format is not 480i, a message
saying ‘Not Valid Format’ and when the input signal is not
coming out, a message saying ‘Check Signal Status’ is
displayed for 1 second.
F. ADC 1080P Component1/RGB adjustment
- Check the Component1, RGB connected condition from the
using device.
- (MSPG-925FA : => model :225 , pattern :65 )
G. Input Component 100% Horizontal Color Bar Pattern
(HozTV31Bar) of 480i Mode that is supported, select the input
to Component1 and select the video to ‘Normal’.
H. Wait for more than 1 second after receiving the signal and
then press the ADJ KEY on the adjustment R/C to enter ‘Ez –
Adjust’. Select ‘4. ADC 1080P Comp1/RGB’ and press the
Enter KEY to make the automatic adjustment for component
1 first.
I. When the adjustment is normally completed, a message
saying "ADC Component1 Success" is displayed, and when
the adjustment is not normally completed, a message saying
‘ADC Component1 1080P Fail’ is displayed.
J. After the Component1 adjustment is completed, it is
automatically switch to RGB-DTV Mode to start RGB
adjustment. When the adjustment is normally completed, a
message saying "ADC RGB 1080P Success" is displayed.
K. When the adjustment is not normally completed, make the
adjustment again after checking the pattern or adjustment
condition. The error message is as E.
L. When the adjustment is completed, press the ADJ KEY to exit.
6. EDID(The Extended Display
Identification Data)/DDC
(Display Data Channel) Download
6.1 Introduction
This has been established by VESA and is the function
created to "Plug and Play" by making the computer
reconfigure user environment through communication with
the monitor automatically without having the user set
commands directly to the PC or the monitor so that the user
can use it immediately.
When writing EDID, use the DDC2B protocol.
6.2 HDMI EDID Data input
1) Using device
a. Jig for PC, DDC adjustment (PC serial to D-sub connection
device)
b. DDC recording S/W (EDID Data Write & Read)
c. D-Sub terminal
d. Separate HDMI Cable connecting JIG is necessary
2) Adjustment preparation and device configuration
e. Configure as Fig., and turn on the PC
f. Turn on the JIG.
g. Run the DDC recording S/W (EDID Data Write & Read).
(Execute in DOS mode)
LCD TV SET
(or Digital Board)
Device configuration diagram for HDMI EDID Data input

- 16 -
6.3 EDID Data for LA73A

- 17 -
7. White Balance adjustment
7-1. Using device
A. Color Analyzer : CA-210 (CH 9)
When adjusting the LCD white balance, use CS-1000 as the
color analyzer (CA-210) and channel 9 corrected of Matrix
(corrected for White, Red, Green, Blue) and the adjustment
must be done in accordance with the White balance
adjustment coordinate.
B. Automatic adjuster (Necessary for automatic adjustment, must
be able to communicate with RS-232C, Baud Rate : 115200)
C. Video Signal Generator MSPG-925F 720p, 216Gray(Model :
217, Pattern 78
7-2. Measuring device connection diagram
(for automatic adjustment)
=> Connection diagram for internal pattern
=> Connection diagram for HDMI input
7-3. White Balance adjustment method
Basically it uses the internal pattern but when internal pattern is
not possible, you can select HDMI input for adjustment. Through
the option at the most bottom part of the Ez Adjust Menu 7.White
Balance menu, you can select NONE, INNER and HDMI, and the
default is set to INNER. When the adjustment cannot be done
with the internal pattern, you can select HDMI input for
adjustment.
For manual adjustment, press the ADJ KEY of the adjustment
R/C to enter Ez Adjust 7.White-Balance, and the pattern is
automatically displayed. (When you set the Option to INNER, the
default is always set to INNER)
A. Connect the set according to the internal pattern or HDMI
input in accordance with 4.3.2 measuring device connection
diagram.
B. Set the Baud Rate of RS-232C to 115200. It is set to 115200
as default.
C. Connect the RS-232C Cable to the set.
D. Connect the HDMI Cable to the set. (Limited to the set with
HDMI option)
E. Select and adjust the model applicable to LA73A chassis from
the adjuster
Caution) For automatic adjustment, RS-232C Command and
Chassis are commonly applied
7.3.1 White Balance adjustment (For automatic adjustment)
- Execute Power Only Key of the adjustment R/C to execute
automatic adjustment. Set the Baud Rate to 115200.
: Always start adjustment with "wb 00 00" and end
adjustment with "wb 00 ff"
: Adjust the offset if necessary.
7-4. White Balance adjustment
(For manual adjustment)
O Using device: CA-210
=> When adjusting the plasma white balance, use CS-1000
as the color analyzer (CA-210) and channel 9 corrected of
Matrix (corrected for White, Red, Green, Blue) and the
adjustment must be done in accordance with the below
White balance adjustment coordinate.
O Manual adjustment must be done in the following order
A. Press the ADJ of adjustment R/C to enter ‘EZ-ADJUST’.
B. Select 10.TEST PATTERN using the CH + / - KEY and
press the Enter KEY to execute a heat run for more than
30 minutes.
C. Execute a Zero Calibration for CA-210 and put it at
distance of less than 10Cm from the LCD module surface
center during the adjustment.
D. Press the ADJ of adjustment R/C, select ‘7.White-Balance’
of ‘Ez – Adjust’ and enter the adjustment mode using the
right key (G).
(When you press the ¢∫button, the screen enters the full
white internal pattern..)
E. The adjustment is executed in 3 different white balance of
COOL, MEDIUM and WARM.
F. When the white balance is Cool,
Fix B Gain 192, fix R-Cut / G-Cut / B-Cut 64,
and use R Gain / G Gain to adjust the High Light.
When the white balance is Medium,
Fix R Gain 192, fix R-Cut / G-Cut / B-Cut 64,
and use G Gain / B Gain to adjust the High Light.
When the white balance is Warm
Fix R Gain 192, fix R-Cut / G-Cut / B-Cut 64,
and use G Gain / B Gain to adjust High Light.
G. Use the +, - key for adjustment.
H. When the adjustment is completed, press the OK (ÁKEY)
button to move to the Ez –Adjust screen. Press the ADJ
KEY to exit the adjustment mode.
CA-100+
COLOR
ANALYZER
TYPE; CA-100+
Full W hite Pattern
RS-232C

- 18 -
ATI
X260
ATI
X260
SIF
NTP3000
NTP3000
I2S
SPDIF
I2S
CVBS(NT Main)
DDR2
64MBx2
DDR2
64MBx2
Flex Bus
RGB 30bit
TPA
Analog
Front
End USB 1.1
I2C Port0 I2C CH1
I2C CH2 I2C CH3
MTV415
Micom
MTV415
Micom
USB (upgrade ready!!)
Dead IC when Standby
Dead IC when Standby
Video
Scaler
0
Video
Scaler
1 or 2
Alive IC when Standby
Alive IC when Standby 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)
Flash
(NOR 32MB)
Latchx2
Latchx2
24C512
24C512
Cable
AT/NT VSB
LGDT3303
VSB
LGDT3303
63LVD1023
63LVD1023 1080P
LVDS
Con.
1080P
LVDS
Con.
Dual
AV1 / L/R GPIO
I2S
ATI
X260
(# of MPEG decoder)
COMP2
RGB
CS8416
CS8416
HDMI SPDIF
I2S
I2S
MST3361
1HDMI +
1ADC
MST3361
1HDMI +
1ADC
RGB
HDMI1/2/3
SPDIF SPDIF
Opt.
FRC94xyH
FRC94xyH
DDR1
16MB
DDR1
16MB
RGB odd
RGB even
120Hz
TPB
USB 1.1 USB(EMF)
PCI
3:1
Demux
3:1
Demux
24C16
24C16
Air
3:1
Demux
3:1
Demux
MSP4450K
MSP4450K
I2S
SIF
TROUBLESHOOTING & BLOCK DIAGRAM

- 19 -
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

- 20 -
+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
Live Power Dead 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