LG 37LC7D Series User manual

R
LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LA73E
MODEL : 37LC7D 37LC7D-UB

- 2 -
CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
SPECIFICATION........................................................................................6
ADJUSTMENT INSTRUCTION................................................................11
TROUBLE SHOOTING & BLOCK DIAGRAM ........................................17
EXPLODED VIEW .................................................................................. 43
REPLACEMENT PARTS LIST ............................................................... 45
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
T
o Instrument's
e
xposed
M
ETALLIC 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 26 inch Wide – 26 inches(582.96mm) For 26LC7D-UB
32 inch Wide - 31.51inches(800.4mm) For 32LC7D-UB,32LC4D-UA
37 inch Wide – 32.02 inches(940.3mm) For 37LC7D-UB
42 inch Wide – 42.02 inches(1067.308mm) For 42LC7D-UB,42LC4D-UA
6. Aspect Ratio 16:9
7. Tuning System FS
8. LCD Module T260XW02-V5 For 26LC7D-UE
LC320WX4-SLA1 For 32LC7D-UB,32LC4D-UA
LC370WX3-SLA1 For 37LC7D-UB
LC420WX6-SLA1 For 42LC7D-UB,42LC4D-UA
9. Operating Environment 1) Temp : 0 ~ 40 deg
2) Humidity : ~ 80 %
10. Storage Environment 1) Temp : -20 ~ 60 deg
2) Humidity : 0 ~ 90 %
1. Application Range.
This spec sheet is applied to the 37"/42" LCD TV used LA73E
chassis.
2. Especificación
Each part is tested as below without special appointment
2.1 Temperature : 20 ±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. Chroma & Brightness
5-1. 37LC7D-UB
CONDITION : EZ-Picture "Daylight"
5-2. 42LC7D-UB, 42LC4D-UA
CONDITION : EZ-Picture "Daylight"
No Item Min Typ Max Unit Remark
1. White peak brightness 360 450 cd/m2HDMI input, full white,
Video Black level=High
2. Contrast ratio 700:1 900:1 Non dimming mode
(PC Mode)
3000:1 4000:1 5000:1 Dimming mode
1. Input full black, wait 10 minute ,
measure black level
2. Input full white , wait 10 minute,
measure white level
3. Brightness uniformity 1.3 Refer to LCD SPEC.
4. Color coordinate RED X 0.633 +/- 0.03
Y 0.339 +/- 0.03
GREEN X 0.286 +/- 0.03
Y 0.610 +/- 0.03
BLUE X 0.147 +/- 0.03
Y 0.065 +/- 0.03
WHITE X 0.276 +/- 0.03
Y 0.283 +/- 0.03
5. Viewing angle 178 R/L, U/D
6. Color Temperature Standard 8,300 9,300 10,300 <Test Signal>
Cool 10,000 11,000 12,000
HDMI input, With 16-gray pattern
Warm 5,500 6,500 7,500 6th bar from right
No Item Min Typ Max Unit Remark
1. White peak brightness 360 450 cd/m2HDMI input, full white,
Video Black level=High
2. Contrast ratio 800:1 1000:1 Non dimming mode
(PC Mode)
3000:1 4000:1 5000:1 Dimming mode
1. Input full black, wait 10 minute ,
measure black level
2. Input full white , wait 10 minute,
measure white level
3. Brightness uniformity 1.3 Refer to LCD SPEC.
4. Color coordinate RED X 0.633 +/- 0.03
Y 0.339 +/- 0.03
GREEN X 0.286 +/- 0.03
Y 0.610 +/- 0.03
BLUE X 0.147 +/- 0.03
Y 0.065 +/- 0.03
WHITE X 0.276 +/- 0.03
Y 0.283 +/- 0.03
5. Viewing angle 178 R/L, U/D
6. Color Temperature Standard 8,300 9,300 10,300 <Test Signal>
Cool 10,000 11,000 12,000 HDMI input,
Warm 5,500 6,500 7,500 Daylight/Cool 85 IRE

- 8 -
6. Component Video Input (Y, PB, PR)
No. Specification Remark
Resolution H-freq(kHz) V-freq(Hz)
1. 720*480 15.73 59.94 SDTV ,DVD 480I
2. 720*480 15.73 60.00 SDTV ,DVD 480I
3. 720*480 31.47 59.94 SDTV 480P
4. 720*480 31.50 60.00 SDTV 480P
5. 1280*720 44.96 59.94 HDTV 720P
6. 1280*720 45.00 60.00 HDTV 720P
7. 1920*1080 33.72 59.94 HDTV 1080I
8. 1920*1080 33.75 60.00 HDTV 1080I
9. 1920*1080 27 24 HDTV 1080P
10. 1920*1080 33.75 30 HDTV 1080P
No. Specification Remark
Resolution H-freq(kHz) V-freq(Hz)
Pixel clock(MHz)
PC DDC
1. 640*350 31.469 70.08 25.17 DOS
2. 720*400 31.469 70.08 28.32 DOS O
3. 640*480 31.469 59.94 25.17 VESA(VGA) O
4. 800*600 37.879 60.31 40.00 VESA(SVGA) O
5. 1024*768 48.363 60.00 65.00 VESA(XGA) O
6. 1280*768 47.776 59.87 79.50 CVT(WXGA) O
7. 1360*768 47.720 59.799 84.75 CVT(WXGA) O
8. 1366*768 47.13 59.65 72
7. RGB PC
- RGB PC INPUT Mode Table
- HDMI INPUT(PC/DTV)
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Remark
PC DDC
1. 640*480 31.469 59.94 25.17 VESA(VGA) O
2. 800*600 37.879 60.31 40.00 VESA(SVGA) O
3. 1024*768 48.363 60.00 65.00 VESA(XGA) O
4. 1280*768 47.776 59.87 79.50 CVT(WXGA) O
5. 1360*768 47.720 59.799 84.75 CVT(WXGA) O
6. 1366*768 47.13 59.65 72
DTV
7. 720*480 31.469 59.94 27.00 SDTV 480P
8. 720*480 31.500 60.00 27.03 SDTV 480P
9. 1280*720 44.96 59.94 74.17 HDTV 720P
10. 1280*720 45.00 60.00 74.25 HDTV 720P
11. 1920*1080 33.72 59.94 74.17 HDTV 1080I
12. 1920*1080 33.75 60.00 74.25 HDTV 1080I
13. 1920*1080 27 24.00 74.25 HDTV 1080P
14. 1920*1080 33.75 30.00 74.25 HDTV 1080P

- 9 -
8. Mechanical specification
1) 37LC7D
No. Item Content Unit Remark
1. Product Widt(W) Length(D) Height(H) mm
Dimension Before Packing 927 280.5 692.8 mm With Stant
After Packing 999 264 874 mm
2. Product Only SET 20 Kg
With BOX 25 Kg
2) 42LC7D
No. Item Content Unit Remark
1. Product Widt(W) Length(D) Height(H) mm
Dimension Before Packing 1033.4 287.6 750 mm With Stant
After Packing 1119 374 858 mm
2. Product Only SET 24.9 Kg
With BOX 30.4 Kg

- 10 -
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

- 11 -
ADJUSTMENT INSTRUCTION
1. Application Object
These instructions are applied to all of the LCD TV, LA73E.
2. Notes
(1) Because this is not a hot chassis, it is not necessary to use
an isolation transformer. However, the use of isolation
transformer will help protect test equipment.
(2) Adjustments must be done in the correct order.
(3) The adjustments must be performed in the circumstance of
20±5°C of temperature and 65±10% of relative humidity if
there is no specific designation.
(4) The input voltage of the receiver be must kept 110V, 60Hz
when adjusting.
(5) The receiver must be operational for about 15 minutes
prior to the adjustments.
Perform preliminary operation after receiving 100% White
Pattern (06CH).
(Or 3. White Pattern status of Ez-Adjust)
White Pattern entry method
A) Enter into Ez-Adjust by pressing the ADJ key on the
adjustment R/C.
B) 100% FULL WHITE PATTERN appears if pressing the
OK ( ) key after selecting the 3.WHITE PATTERN with
the CH + / - KEY.
* It is possible to heat run the set without a separate
signal generator in this mode.
Caution : Care must be taken as afterimage
phenomena may occur about the black level part of
screen If leaving pause image turned on for more
than 20 minutes (especially inner digital pattern (13
CH), Cross Hatch Pattern (09CH) with significant
black/white contrast).
3. MICOM Download(Option)
3-1. Required Test Equipment
(1) JIG-LEVER TYPE for adjusting: 1EA
(2) PC & MONITOR: 2EA
(3) BOARD for INTERFACE: IIC & ISP BOARD: 2EA
(4) 15P D-SUB CABLE: 2EA
(5) Using the 12/15 line of D-SUB 15P
12-SDA/15-SCL
3-2. JIG Connection
3-3. Establishment Program
(1) Establish LGE Monitor Tools v1.1
(2) The program work and it is opened program window as
seen below.
connection
to PC connection
to PC

- 12 -
(3) Click the first icon shown in fig.9. The window seen in
fig.10 should appear.
3-4. Set Method
(1) MCU Select: MTV512M64
(2) Option
R/W Option: Auto Write(Verity)
Jig Option: Myson
Transmit Speed: Medium
(3) Check: Just do it with blank micom.
(4) PORT
Chose Parallel Port (normal LPT1)
Attention: You must chose EPP when select Rom BIAS at
LPT
3-5. Download Method
(1) Click the Load File.
(2) Locate and select the correct file from your computer.
(*.hex).
(3) Click the Send.
(4) When you see (ISP COMPLETE) the download is
complete.

- 13 -
6. ADC-Set Adjustment
6-1. Synopsis
ADC-Set adjustment to set the black level and the Gain to
optimum.
6-2. Test Equipment
Service R/C, 801GF(802V, 802F, 802R) or MSPG925FA
Pattern Generator
(480i/1080i The Horizontal 100% Color Bar Pattern adjust to
within 0.7±0.1Vp-p)
[ADC adjustment (MSPG-925Fx series) Model No. & Pattern No.]
- Model No.: #209(480i adjustment), #223(1080i adjustment)
- Pattern No.: #65(7ColorBar Pattern)
6-3. Adjustment
(1) Select Component1 as the input with 100% Horizontal
Color Bar Pattern(HozTV31Bar) in 480i Mode
(2) After receiving signal for at least 1 second, press the ADJ
Key on the Service R/C to enter the ‘Ez - Adjust’ and select
the ‘2. ADC 480i Comp1’.
Pressing the Enter Key to adjust automatically.
(3) When the adjustment is over, 'MST3361 Component
Success’ is displayed. If the adjustment has errors,
'MST3361 Configuration Error’ is displayed.
(4) Select Component1 as the input with 100% Horizontal
Color Bar Pattern(HozTV31Bar) in 1080i Mode.
(5) After receiving signal for at least 1 second, press the ADJ
Key on the Service R/C to enter the ‘Ez - Adjust’ and select
the ‘3. ADC 1080i Comp1/RGB’.
Pressing the Enter Key to adjust automatically.
(6) When the adjustment is over, 'MST3361 Component
Success’ is displayed. If the adjustment has errors,
'MST3361 Configuration Error’ is displayed.
(7) After the Component MST3361 adjustment is over, convert
the RGB-DTV Mode and display Pattern.
When the adjustment is over, 'MST3361 RGB_DTV
Success’ is displayed.
(8) Readjust after confirming the case Pattern or adjustment
condition where the adjustment errors.
(9) After adjustment is complete, exit the adjustment mode by
pressing the ADJ KEY.
<Fig. 2> Adjustment Mode
<Fig. 3> Adjustment Pattern: 480i/1080i 60Hz HozTV30 Bar
Pattern

- 14 -
7. EDID(The Extended Display
Identification Data)/DDC
(Display Data Channel) Download
This is the function that enables “Plug and Play".
7-1. HDMI EDID Data Input
(1) Required Test Equipment
1) PC, Jig for adjusting DDC. (PC serial to D-sub
Connection equipment)
2) S/W for writing DDC(EDID data write & read)
3) D-Sub cable
4) Jig for HDMI Cable connection
(2) Preparation for Adjustments &
Setting of Device
1) Set devices as below and turn on the PC and JIG.
2) Open S/W for writing DDC (EDID data write & read).
(operated in DOS mode)
7-2. EDID DATA for LA73E
:EDID for HDMI-1 (DDC (Display Data Channel) Data)
EDID Block 0 table =
EDID Block 1 table =
:EDID for HDMI-2 (DDC (Display Data Channel) Data)
EDID Block 0 table =
EDID Block 1 table =
:EDID for RGB-PC
EDID Block 0 table =
0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 00 11 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23
20 | 09 48 4C 2F CE 00 31 40 45 40 61 40 01 01 01 01
30 | 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 | 36 00 C4 8E 21 00 00 1E 0E 1F 00 80 51 00 1E 30
50 | 40 80 37 00 C4 8E 21 00 00 1C 00 00 00 FD 00 38
60 | 4B 1F 3C 09 00 0A 20 20 20 20 20 20 00 00 00 FC
70 | 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 98
0 | 02 03 16 F1 46 84 05 03 02 20 22 23 15 07 50 66
10 | 03 0C 00 10 00 80 01 1D 00 72 51 D0 1E 20 6E 28
20 | 55 00 C4 8E 21 00 00 1E 01 1D 80 18 71 1C 16 20
30 | 58 2C 25 00 C4 8E 21 00 00 9E 8C 0A D0 8A 20 E0
40 | 2D 10 10 3E 96 00 C4 8E 21 00 00 18 8C 0A D0 8A
50 | 20 E0 2D 10 10 3E 96 00 13 8E 21 00 00 18 00 00
60 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 25
0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 00 11 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23
20 | 09 48 4C 2F CE 00 31 40 45 40 61 40 01 01 01 01
30 | 01 01 01 01 01 01 01 1D 00 72 51 D0 1E 20 6E 28
40 | 55 00 C4 8E 21 00 00 1E 01 1D 80 18 71 1C 16 20
50 | 58 2C 25 00 C4 8E 21 00 00 9E 00 00 00 FC 00 4C
60 | 47 20 54 56 0A 20 20 20 20 20 20 20 00 00 00 FD
70 | 00 38 4B 1F 3C 09 00 0A 20 20 20 20 20 20 01 66
0 | 02 03 16 F1 46 84 05 03 02 20 22 23 15 07 50 66
10 | 03 0C 00 20 00 80 8C 0A D0 8A 20 E0 2D 10 10 3E
20 | 96 00 C4 8E 21 00 00 18 8C 0A D0 8A 20 E0 2D 10
30 | 10 3E 96 00 13 8E 21 00 00 18 00 00 00 00 00 00
40 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
50 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
60 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 B3
0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 00 11 01 03 68 73 41 96 0A CF 30 A3 57 4C B0 23
20 | 09 50 4E A1 08 00 01 01 01 01 01 01 01 01 01 01
30 | 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 | 36 00 C4 8E 21 00 00 1E 0E 1F 00 80 51 00 1E 30
50 | 40 80 37 00 C4 8E 21 00 00 1C 00 00 00 FD 00 38
60 | 4B 1F 3C 09 00 0A 20 20 20 20 20 20 00 00 00 FC
70 | 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 00 D0
LCD TV SET
(or Digital Board)

- 15 -
8. Adjustment of White Balance
8-1. The Purpose and Principal of Color
Temperature Adjustment
(1) Purpose: to reduce the difference in color temperature
among modules
(2) Principal: A module is in full dynamic range when RGB
Gain on OSD is 192. To adjust the white balance without
causing full dynamic range and full data, fix one of RGB
Gains at 192 and control the other two by reducing them
from 192.
8-2. Required Equipment
(1) Color Analyzer : CA-110 or CA-210
(2) Automatic adjustor (with automatic adjustment necessity
and the RS-232C communication being possible)
8-3. Connection Diagram of Equipment
for Measuring (Automatic Adjustment)
Use the internal pattern to adjust White Balance. The pattern
is automatically given when the automatic adjustment device
is connected or when a user presses ADJ on the remote
controller to start Ez Adjust and then selects 6.White-Balance.
[Requirements for Automatic Adjustment
(1) The illuminance of surroundings
10 lux or less; preventing light in surroundings as much as
possible
(2) The location of the Probe
1) For PDP: place the color analyzer (CA-110, CA-210)
close to the surface of a module and start the
adjustment.
2) For LCD: place the color analyzer (CA-110, CA-210)
close to the surface of a module within 10 cm and keep
the probe of the color analyzer at 80° to 100° angle from
the surface of a module.
(3) Aging time
1) Once Aging is started, keep the power on without power
supply interruption for at least 15 minutes for heat run.
2) For PDP, use the internal pattern to adjust White
Pattern.
3) For LCD, use NO SIGNAL or Full White Pattern to
ensure the backlight is turned on.
8-4. Adjustment of White Balance
(Automatic Adjustment)
(1) Turn on the POWER ON( ) of the remote controller to set
the adjustment and then start the automatic adjustment or
set the Baud Rate to 115200.Â) of the remote controller to
(2) Start the adjustment from “wb 00 00” and complete it at
“wb 00 ff”. (Adjust the offset if necessary)
wb 00 00 the automatic adjustment of White Balance is
started.
wb 00 10 adjusting gain (internal pattern appears) is
started.
ja 00 ff adjusting data
jb 00 c0
...
wb 00 1f adjusting gain is completed.
Adjust the offset (from wb 00 20 to wb 00 2f) if necessary.
wb 00 ff the automatic adjustment of White Balance
(internal pattern disappears) is completed.
CA-100+
COLOR
ANALYZER
TYPE; CA-100+
Full W hite Pattern
RS-232C
Connection Diagram of Automatic Adjustment

- 16 -
[[RS-232C Command (Automatic Adjustment)
LA73E Chassis Model All]
8-5. Adjustment of White Balance
(Manual Adjustment)
Required Equipment : CA-210
(1) Enter ‘Ez - Adjust’ by pressing ADJ KEY on the Service
Remote Control.
(2) Select "9. TEST PATTERN" using CH +/- Key and HEAT
RUN at least 30 minutes by pressing the ENTER Key.
(3) Zero Calibrate of the Color Analyzer, then attach sensor to
LCD module surface when you adjust.
(4) Select ‘6. White-Balance’ of ‘Ez - Adjust’ by pressing the
ADJ KEY on the Service R/C. Then enter adjustment mode
by pressing the Right KEY (
G ) .
(The internal pattern of full white appears by pressing
G )
(5) The adjustment is conducted in three levels of color
temperature; COOL, MEDIUM, and WARM.
[Color temperature: Cool, Medium, Warm
(1) When R Gain is fixed at 192,
Control G Gain and B Gain by reducing them from 192.
(2) When B Gain is fixed at 192,
Control R Gain and G Gain by reducing them from 192.
(3) When G Gain is fixed to 192,
Control R Gain and B Gain by reducing them from 192.
Fix one of three Gains (R Gain, G Gain, and B Gain) at 192
and control the other two by reducing values from 192 to
prevent it from increasing.
(When RGB Gains are all 192, the module is in full dynamic
range.)
R Gain
G Gain
B Gain
R Cut
G Cut
B Cut
jg
jh
ji
Cool
ja
jb
jc
Mid
RS-232C COMMAND
[CMD ID DATA]
CENTER
(DEFAULT)(Decimal)
jd
je
jf
00
00
00
192
192
192
Warm
Min
Max
(Deci
mal)
64
64
64
Cool
64
64
64
Mid
64
64
64
Warm
9. USB S/W Download (Option)
9-1. Overview
USB Download enables quick response to S/W upgrading
and helps to configure the panel to the latest updates.
9-2. How to Download
(1) Before starting USB download, ensure that the power is
turned off and the display is turned on.
(2) Once the USB memory stick containing the upgraded file
is connected to the USB port on the main board, the
following picture appears on the screen.
(3) Check the current version at [Current TV Software Version
Information] and the target version at [New Found TV
Software Version Information]. Press Enter on the remote
controller to confirm the upgrade.
(4) The following picture shows the downloading in progress.
Once the download is completed, the power is
automatically turned on and off. (Otherwise, please turn
the power on and off)
(5) Once the download is completed, remove the USB
memory stick from the USB port. Press IN-START on the
remote controller to check the upgraded S/W version at
the top of the screen while the display is turned on.
Do not plug off.
Press EXIT to cancel the upgrade.
<S/W Upgrade Screen>
The software upgrade is now in progress.
Until the whole process if completed, please.
- Do not remove the memory card from the slot.
- Do not plug off.
Reading the file---Done
Upgrading---Done
The TV will restart automatically in 0 seconds.
<Downloading in progress Screen>

- 17 -
NoRGB DTV
YesAdaptive Picture Mode
¥Audio Output
10W*2
¥Freeze No
Others
Phase, SizeAdjust
DOS70,VGA60,S
VGA60,
XGA60,WXGA60,
SXGA60
RGB In (15 Pin)
YesAuto Navigation (Link)
YesBBE
YesSRS Trusurround TX
Yes(2D)Enhanced Noise Reduction
USE scalier On/Off OSD Menu
YesXD Engine
Use Brief Info
O(PSIP)Program Guide Type
1 RF
1 RF(Air /Cable)RF
RemarkBroadcomFeature
TROUBLESHOOTING & BLOCK DIAGRAM
- Prouct Brief spec

- Block diagram for CI DTV
- 18 -
Side AV V,LR
Rear AV V, LR
Rear S YC, LR
Side S YC, LR
MNT_V_Out
IN1
OUT1
IN4
IN1
IN4
IN5
OUT3
Comp_1 YCbCr
Comp_2YCbCr
IN3
IN4
CVBS
CVBS
ATSC/NT
SC Tuner
CableANT.
64-Bit I/F
BCM3560
12
LVDS Trans
CXA2069(AV S/W)
VDEC_CVBS/S_Y
VSB/QAM/NTSC/SIF
SPDIF Out
I2S Output
SPDIF_OUT
Flash Memory
16MB
HDMI/DVI
RS-232C
SDRAM
256Mbit X-tal
54MHz
Reset IC
Audio
PWM L/R
Sub Micom
(MTV416)
Sub Micom
(MTV416) EEP
ROM
HDMI & Component RGB-PC
Audio
Tuner
Comp_1 LR Comp_2 LR
RGB(Phone) LR AUDIO ADC
Audio R/L I2S I2S Audio Input
MST3361
R/G/B
H/V Sync DVI Input
Digital Output.
SDRAM
256Mbit
DDS
Data [24]
Hsync/Vsync/DE/Clk
2X1
S/W
2X1
S/W
HDCP
IIC
TMDS
DDS
SPDIF
Y,C
IF P/N for DTV
SIF for NTSC
SIF for NTSC
USB for upgrade S/W
LR
MNT_Out
AUDIO DAC
IIS
TMDS

- 19 -
- Powr flow diagram
+12.0V
+12.0V
KIA78R09
KIA78R09 FAN1,2,3
FAN1,2,3 FAN4
FAN4 SI4925DY
SI4925DY MP1593
MP1593 CMO, AUO
CMO, AUO
+9.0V
+9.0V
MC3307
MC3307
CXA2069
CXA2069
ST_5V
ST_5V
BA033FP
BA033FP MTV416GMF
MTV416GMF
3.3VST_MICOM
A3.3V_BCM
A3.3V_BCM
BCM3560
BCM3560
P_+19V
P_+19V
TPA3100
TPA3100
+3.3V
+3.3V
SC1566-2.5
SC1566-2.5 BCM3560
BCM3560 HYDU561622
HYDU561622 SC1566-2.5
SC1566-2.5
D2.6V_BCM A2.6V_BCM
BCM3560
BCM3560 SC1566-2.5
SC1566-2.5
+2.5V_MST
MST3361
MST3361
BCM3560
BCM3560 S29GL128M
S29GL128M THC63LVD
THC63LVD 74LVC14A
74LVC14A MST3361
MST3361
3.3V_MST
DDC
DDC A1.2V_BCM, D1.2V_BCM
BCM3560
BCM3560
+6.0V
+6.0V PQ05DZ1U
PQ05DZ1U
CS4344
CS4344
+5.0V
MM1732
MM1732
CS5331A
CS5331A
FMS6407
FMS6407 FMS6400
FMS6400 TPS2042
TPS2042 74F08D
74F08D
M62320FP
M62320FP
TUNER
TUNER FSA1156
FSA1156
+5V_TU
LM75CIMX
LM75CIMX
AZ1117H-3.3
AZ1117H-3.3 BCM3560
BCM3560
D3.3V_BCM
KIA78R09
KIA78R09
5V_PANEL
AT24C512W
AT24C512W AT24C02N
AT24C02N

- 20 -
- 12C Control block diagram
BCM3560
AV S/W(CXA2069)
Main EEPROM
4.7K J
5.0V
I2C_Channel 0 I2C_Channel 1 ATSC/NTSC Tuner I2C_Channel 2 I2C_Channel 3 Sub-Micom
I2C0_5V I2C1_5V
I2C1_3.3 V
I2C2_3.3 V I2C3_3.3 V
2.7K J
2.7K J
3.3V
M62320
4.7K J
5.0V
PDP Module
I2C Address
0x90
0xC2
0x74
0xA6
0x1C
0x50 0x9C
MST3361
3.3V