LG 32LB9D Series User manual

LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LB73B
MODEL : 32LB9D 32LB9D-AD
website:http://biz.LGservice.com
Internal Use Only

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 2 -
CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ..........................................................................3
SPECIFICATION ........................................................................................6
ADJUSTMENT INSTRUCTION .................................................................9
TROUBLE SHOOTING ...........................................................................14
BLOCK DIAGRAM...................................................................................27
EXPLODED VIEW .................................................................................. 32
REPLACEMENT PARTS LIST ............................................................... 34
SVC. SHEET ...............................................................................................

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 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

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 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 circuit
board 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

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Only for training and service purposes
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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.

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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1. Application range
This specification is applied to LB73B chassis.
2. Requirement for Test
Testing for standard of each part must be followed in below
condition.
(1) Temperature : 25°C±5°C(77±9°F)
(2) Humidity : 65%±10%
(3) Power : Standard input voltage (AC 100-240V, 50/60Hz)
*Standard Voltage of each products is marked by models
(4) Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM.
(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 : CB Specification
EMC : CISPR 13 Specification
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
4. General TV Specification
No Item Specification Remark
1 Broadcasting system PAL-B/G, DTV : DVB-T
2 Available Channel 1) VHF : 0~12
2) UHF : 20 ~ 75
3) CATV: 02 ~ 44
4) DTV : 06 ~ 12, 27 ~ 69
3 Tuner IF 1) PAL : 38.90MHz(Picture)
34.40MHz(Sound)
2) DVB-T : 36.125MHz
4 Input Voltage AC 240 V, 50Hz Mark : 240V, 50Hz
5 Aspect ratio 16:9 (wide)
6 Screen Size 32 inch Wide (1366 x 768)
7 LCD Module LC320WX4-SLD2
8 Operating Environment Temperature : 0 ~ 40 deg
Humidity : 85%
9 Storage Environment Temperature : -20 ~ 60 deg
Humidity : 85%

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Only for training and service purposes
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5. Chroma & Brightness
No Item Min Typ Max Unit Remark
1 White peak Brightness 400 500 cd/m2
(Center 1point / Full White Pattern)
2 White average brightness cd/m2N/A
3 Brightness uniformity 80 % Full white
4 Color coordinate RED X 0.638 ± 0.03
Y 0.340 ± 0.03
GREEN X 0.279 ± 0.03
Y 0.611 ± 0.03
BLUE X 0.146 ± 0.03
Y 0.062 ± 0.03
WHITE X 0.272 ± 0.03
Y 0.278 ± 0.03
5 Color coordinate uniformity N/A
6 Contrast Ratio 800 : 1 1000 : 1
7 Color Temperature Cool 11000 <Test condition>
Standard 9300 HDMI Input,
Warm 6500 85% Full white pattern
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
6. Component Video Input (Y, PB, PR)
No Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Remarks
1. 720*576 15.625 50.00 13.50 SDTV576i
2. 720*576 31.25 50.00 27.00 SDTV576p
3. 720*480 15.73/15.75 59.94/60.00 13.50 SDTV 480i
4. 720*480 31.47/31.50 59.94/60.00 27.00 SDTV 480p
5. 1280*720 44.96/45.00 59.94/60.00 74.25 HDTV 720P
6. 1280*720 37.50 50.00 74.25 HDTV 720P
7. 1920*1080 33.72/33.75 59.94/60.0 74.25 HDTV 1080i
8. 1920*1080 28.125 50.00 74.25 HDTV 1080i
9. 1920*1080 26.97/27.00 23.976/24.00 74.1757/74.25 HDTV 1080P
10. 1920*1080 33.716/33.750 29.97/30.00 74.1762/74.25 HDTV 1080P
11. 1920*1080 56.25 50.00 148.50 HDTV 1080P
12. 1920*1080 67.43/67.50 59.94/60.00 148.50 HDTV 1080P

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Only for training and service purposes
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8. RGB, HDMI/DVI input (PC / DTV)
No Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Remarks
PC DDC
1 720*400 31.469 70.08 28.32 DOS O
2 640*480 31.469 59.940 25.175 VESA(VGA) O
3 640*480 37.500 75.000 31.500 VESA(VGA) O
4 800*600 37.879 60.317 40.000 VESA(SVGA) O
5 800*600 46.875 75.000 49.500 VESA(SVGA) O
6 1024*768 48.363 60.004 65.000 VESA(XGA) O
7 1024*768 56.476 70.069 75.000 VESA(XGA) O
8 1024*768 60.023 75.029 78.750 VESA(XGA) O
9 1280*768 47.776 59.870 79.500 VESA(WXGA) O
10 1360*768 47.712 60.015 85.500 VESA(WXGA) O
11 1366*768 47.13 59.65 72.00
DTV
1 720*576 31.25 50.00 27.00 SDTV576p
2 720*480 31.47/31.50 59.94/60.00 27.00 SDTV 480p
3 1280*720 44.96/45.00 59.94/60.00 74.25 HDTV 720P
4 1280*720 37.50 50.00 74.25 HDTV 720P
5 1920*1080 33.72/33.75 59.94/60.0 74.25 HDTV 1080i
6 1920*1080 28.125 50.00 74.25 HDTV 1080i
7 1920*1080 26.97/27.00 23.976/24.00 74.1757/74.25 HDTV 1080P
8 1920*1080 33.716/33.750 29.97/30.00 74.1762/74.25 HDTV 1080P
9 1920*1080 56.25 50.00 148.50 HDTV 1080P
10 1920*1080 67.43/67.50 59.94/60.00 148.50 HDTV 1080P
7. RGB input (PC)
No Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Remarks
PC DDC
1 720*400 31.469 70.08 28.32 DOS X
2 640*480 31.469 59.940 25.175 ESA(VGA) O
3 640*480 37.500 75.000 31.500 VESA(VGA) O
4 800*600 37.879 60.317 40.000 VESA(SVGA) O
5 800*600 46.875 75.000 49.500 VESA(SVGA) O
6 1024*768 48.363 60.004 65.000 VESA(XGA) O
7 1024*768 56.476 70.069 75.000 VESA(XGA) O
8 1024*768 60.023 75.029 78.750 VESA(XGA) O
9 1280*768 47.776 59.870 79.500 VESA(WXGA) O
10 1360*768 47.712 60.015 85.500 VESA(WXGA) O
11 1366*768 47.13 59.65 72.00

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 9 -
ADJUSTMENT INSTRUCTION
1. Application Object
These instructions are applied to all of the 32" LCD TV,
LB73B
Chassis
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
25±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 220V~,
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 8. White Pattern status of Ez-Adjust)
* How to enter White Pattern
1) Press the POWER ON key on the adjustment remote
control or press the ADJ key on the adjustment remote
control to enter Ez-Adjust.
2) Select the ‘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, It is possible to heat run the set without
separate signal generator.
Caution : When you keep the still screen on for more than
20 minutes (Especially 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. EDID(The Extended Display Identification Data)
/DDC(Display Data Channel) Download
3-1. Synopsis
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 DDC2B protocol.
3-2. 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) Adjustment preparation & device configuration
1) Configure as Fig. 1, and turn on the PC and JIG.
2) Run the DDC recording S/W (EDID Data Write & Read).
(Execute in DOS mode)
3-3. EDID DATA
(1) EDID for HDMI-1 (DDC (Display Data Channel) Data)
(2) EDID for HDMI-2 (DDC (Display Data Channel) Data)
LCD TV SET
<Fig. 1> Connection Diagram of CPLD Download
0123456789ABCDEF
000FFFFFFFFFFFF001E6D010001010101
10 00 11 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23
20 09 48 4C AF CE 00 31 40 45 40 61 40 81 80 A9 40
30 D1 C0 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 C4 8E 21 00 00 1A 02 3A 80 18 71 38 2D 40
50 58 2C 45 00 C4 8E 21 00 00 1E 00 00 00 FD 00 30
60 58 1F 64 11 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 00
0123456789ABCDEF
0 02031EF14E2022101F0102 0304051293
10 14 07 16 23 15 07 50 66 03 0C 00 10 00 80 01 1D
20 00 72 51 D0 1E 20 6E 28 55 00 C4 8E 21 00 00 1E
30 01 1D 80 18 71 1C 16 20 58 2C 25 00 C4 8E 21 00
40 00 9E 8C 0A D0 90 20 40 31 20 0C 40 55 00 4C 6C
50 42 00 00 18 01 1D 00 BC 52 D0 1E 20 B8 28 55 40
60 C4 8E 21 00 00 1E 01 1D 80 D0 72 1C 16 20 10 2C
70 25 80 C4 8E 21 00 00 9E 00 00 00 00 00 00 00 58
0123456789ABCDEF
000FFFFFFFFFFFF001E6D010001010101
10 00 11 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23
20 09 48 4C AF CE 00 31 40 45 40 61 40 81 80 A9 40
30 D1 C0 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 C4 8E 21 00 00 1A 02 3A 80 18 71 38 2D 40
50 58 2C 45 00 C4 8E 21 00 00 1E 00 00 00 FD 00 30
60 58 1F 64 11 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 00
0123456789ABCDEF
0 02031EF14E2022101F0102 0304051293
10 14 07 16 23 15 07 50 66 03 0C 00 20 00 80 01 1D
20 00 72 51 D0 1E 20 6E 28 55 00 C4 8E 21 00 00 1E
30 01 1D 80 18 71 1C 16 20 58 2C 25 00 C4 8E 21 00
40 00 9E 8C 0A D0 90 20 40 31 20 0C 40 55 00 4C 6C
50 42 00 00 18 01 1D 00 BC 52 D0 1E 20 B8 28 55 40
60 C4 8E 21 00 00 1E 01 1D 80 D0 72 1C 16 20 10 2C
70 25 80 C4 8E 21 00 00 9E 00 00 00 00 00 00 00 48

(3) EDID for HDMI-3 (DDC (Display Data Channel) Data)
(4) EDID for RGB
4. MST3361M-Set Adjustment
4-1. Synopsis
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.
4-2. Test Equipment
Adjustment remote controller, 801GF (802B, 802F, 802R),
MSPG925FA, MSPG-1025D Pattern Generator (480i/
1080P Horizontal 60Hz Color Bar Pattern output must be
possible and output level must be adjusted accurately to
0.7±0.1Vp-p.)
4-3. Adjustment
(1) How to adjustment the Component1
1) Input color bar pattern of 480i 60Hz mode that is supported
to Component 1 input and select ‘Component 1’.
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 ‘1. ADC 480i Comp1’. Press the Vol+
Key to adjust the component1.
3) When the adjustment is completed normally, a message
saying “ADC Component1 Success” is displayed and
when the adjustment is not completed normally, a
message saying ‘ADC Component1 480i Fail’ is
displayed.
4) 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.
(2) How to adjustment the Component2, RGB
1) Input color bar pattern of 1080p 60Hz mode that is
supported to Component 2, RGB input and select
‘Component 2’.
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. Adjust 1080p Comp2/ RGB’. Press the
Vol+ key to adjust the component 2.
3) When the adjustment is completed normally, a message
saying ‘ADC Component2 Success’ is displayed. and
when the adjustment is not completed normally, a
message saying ‘ADC Component2 1080p Fail’ is
displayed.
4) When the adjustment is not normally completed, make
the adjustment again after checking the pattern or
adjustment condition. The error message is as 4-3/ (1)/
4).
5) After adjustment is complete, exit the adjustment mode
by pressing the ADJ KEY.1
- 10 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
(Fig. 2) Adjust Pattern :100% 8 Color Bar Pattern
0123456789ABCDEF
000FFFFFFFFFFFF001E6D010001010101
10 00 11 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23
20 09 48 4C AF CE 00 31 40 45 40 61 40 81 80 A9 40
30 D1 C0 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 C4 8E 21 00 00 1A 02 3A 80 18 71 38 2D 40
50 58 2C 45 00 C4 8E 21 00 00 1E 00 00 00 FD 00 30
60 58 1F 64 11 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 00
0123456789ABCDEF
0 02031EF14E2022101F0102 0304051293
10 14 07 16 23 15 07 50 66 03 0C 00 30 00 80 01 1D
20 00 72 51 D0 1E 20 6E 28 55 00 C4 8E 21 00 00 1E
30 01 1D 80 18 71 1C 16 20 58 2C 25 00 C4 8E 21 00
40 00 9E 8C 0A D0 90 20 40 31 20 0C 40 55 00 4C 6C
50 42 00 00 18 01 1D 00 BC 52 D0 1E 20 B8 28 55 40
60 C4 8E 21 00 00 1E 01 1D 80 D0 72 1C 16 20 10 2C
70 25 80 C4 8E 21 00 00 9E 00 00 00 00 00 00 00 38
0123456789ABCDEF
000FFFFFFFFFFFF001E6D010001010101
10 0E 11 01 03 18 73 41 96 0A CF 74 A3 57 4C B0 23
20 09 48 4C AF CF 00 31 40 45 40 61 40 81 80 A9 40
30 D1 C0 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 C4 8E 21 00 00 1A 02 3A 80 18 71 38 2D 40
50 58 2C 45 00 C4 8E 21 00 00 1E 00 00 00 FD 00 30
60 58 1F 64 11 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 59
0123456789ABCDEF
0 020304000E1F008051001E3040803700
10 C4 8E 21 00 00 1C 00 00 00 00 00 00 00 00 00 00
20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30 00 00 00 00 00 00 00 00 00 00 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 25

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 11 -
5. Adjustment of White Balance
5-1. Required Equipment
(1) Color analyzer : CA-210(CH 9)
- When you adjust LCD color temperature, on color
analyzer (CA-210), you should use Channel 9 which is
Matrix compensated (White, Red, Green, Blue revised)
by CS-1000 and adjust in accordance with White balance
adjustment coordinate which is specified on the next.
(2) Automatic adjustor (with automatic adjustment hour
necessity and the RS-232C communication being possible.
Baud Rate = 115200)
(3) Video Signal Generator MSPG-925F 720p, 216 Gray
(Model : 217, Pattern : 78)
5-2. Measuring device connection diagram
(Automatic Adjustment)
5-3. 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 5.White Balance menu, you can select NONE, INNER,
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 6.White-Balance, and the pattern is
automatically displayed. (When you set the Option to INNER,
the default is always set to INNER)
1) Connect the set according to the internal pattern or HDMI
input in accordance with 5.2 measuring device connection
diagram.
2) Set the Baud Rate of RS-232C to 115200. It is set to
115200 as default.
3) Connect the RS-232C Cable to the set.
4) Connect the HDMI Cable to the set. (Limited to the set with
HDMI option)
5) Select and adjust the model applicable to LB73B chassis
from the adjuster.
Caution) When you adjust automatically, RS-232C Command
is used.
Wb 00 00 Start automatic adjustment of white balance
Wb 00 10 Start gain adjustment (Internal pattern)
Ja 00 ff Adjustment data
Jb 00 c0
…
Wb 00 1f End gain adjustment
* Adjust offset as necessary (wb 00 20(Start), wb 00 2f(End))
Wb 00 ff End automatic adjustment of white balance
(Internal pattern disappears)
Caution) Adjustment map
* 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.
R Gain
G Gain
B Gain
R Cut
G Cut
B Cut
CENTER
(DEFAULT)(Hex)
00
00
00
192
192
192
127
127
127
Min
Max
192
192
192
64
64
64
Cool
192
192
192
64
64
64
Mid
192
192
192
64
64
64
Warm
RS-232C COMMAND
[CMD ID DATA]
jg
jh
ji
Cool
ja
jb
jc
Mid
jd
je
jf
Warm
Color Analyzer
Full W hite Pattern
RS-232C
(Inner Pattern)
<Fig. 3> Connection diagram for internal pattern
<Fig. 4> Connection diagram for HDMI input
Remark
RS-232C Command
[CMD ID DATA]
wb
wb
wb
wb
wb
wb
00
00
00
00
00
00
00
10
1f
20
2f
ff
Start white balance adjustment
Start Gain adjustment(Internal white pattern)
End Gain adjustment
Start Offset adjustment (Internal white pattern)
End Offset adjustment
End white Balance adjustment (Internal pattern disappear)

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5-4. Adjustment of White Balance
(For manual adjustment)
(1) Required Equipment
: 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 below
White balance adjustment coordinate.
(2) Sequence
1) Press the ADJ of adjustment adjustment remote control
to enter ‘EZ-ADJUST’.
2) Select 9.TEST PATTERN using the CH + / - KEY and
press the Enter KEY to execute a heat run for more
than 30 minutes.
3) 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.
4) Press the ADJ of adjustment remote control, select
‘6.White-Balance’ of ‘Ez – Adjust’ and enter the
adjustment mode using the right key (G).
(When you press the Gbutton, the screen enters the full
white internal pattern.)
5) The adjustment is executed in 3 different white balance
of COOL, MEDIUM and WARM.
2) In case that White balance is COOL.
- Fix R-Cut/ G-Cut/ B-Cut to 64 and adjust the color
coordinates t downward.
In case that White balance is Medium.
- Fix R-Cut/ G-Cut/ B-Cut to 64 and adjust the color
coordinates t downward.
In case that White balance is Warm
- Fix R-Cut/ G-Cut/ B-Cut to 64 and adjust the color
coordinates t downward.
- Adjust by using Vol ± key.
4) When the adjustment is completed, press the OK (A)
key button to move to the Ez –Adjust screen. Press the
ADJ KEY to exit the adjustment mode.
* Note : White Balance adjustment coordinate and white balance
1) Standard white balance standard white balance
coordinate when using CS-1000 device
COOL : T=11000K, Δuv=0.000, x=0.276, y=0.283
MEDIUM : T=9300K, Δuv=0.000, x=0.285, y=0.293
WARM : T=6500K, Δuv=0.000, x=0.313, y=0.329
2) Directed color coordinate when using CA-210 CH 9
* Brightness: Full white 216gray
6. Video Set adjustment
6-1. Synopsis
This is a adjustment to reduce the color difference of RF,
video signal.
6-2. Analog RF and AV-PAL Adjustment
1) 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 : 202(PAL), Pattern : 33(100%
color Bar), the following video is displayed on the screen.
* Because the above pattern can differ by the model and
pattern for each device, you must check the pattern first.
2) When the receiving signal is confirmed after inputting the
internal signal, press the ADJ key on the adjustment
remote control to enter ‘EZ-ADJUST’. Select ‘3.Adjust RF
and Video’ and press the right key (G) to enter the
adjustment mode.
3) When you enter the adjustment mode, the video is
automatically set to TV 3CH and the following window is
displayed.
4) When the adjustment is completed, a message saying ‘RF
Configuration Success’ is displayed. If the adjustment has
failed, a message saying ‘RF Configuration Fail’ is
displayed.
5) When the automatic adjustment of RF signal is completed,
it is automatically switched to the AV1 Mode, and
automatic adjustment for Video Mode is done. When the
automatic adjustment is completed, a message saying ‘AV-
PAL Configuration Success’ is displayed. If the adjustment
has failed, a message saying ‘AV-PAL Configuration Fail’
is displayed.
- 12 -
Color temperature Color analyzer Color coordinate
XY
COOL CA-210 0.276 ± 0.002 0.283 ± 0.002
MEDIUM CA-210 0.285 ± 0.002 0.293 ± 0.002
WARM CA-210 0.313 ± 0.002 0.329 ± 0.002
<Fig 5> Model : 202(PAL), Pattern 33(100% color Bar)
<Fig 6>

6-3. AV NTSC adjustment
1) Connect the Video Signal Generator (Master) to AV input
terminal with AV output. At this time, when you enter the
input pattern as Model : 201(NTSC), Pattern : 33(100%
color Bar), the following video is displayed on the screen.
2) Press the ADJ key on the adjustment remote control to
enter ‘EZ-ADJUST’. Select ‘4.Adjust AV_NTSC’ and press
the right key (G) to enter the adjustment mode.
3) When the adjustment is completed, a message saying ‘AV-
NTSC Configuration Success’ is displayed. If the
adjustment has failed, a message saying ‘AV-NTSC
Configuration Fail’ is displayed.
- 13 - LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
<Fig 6> Model : 201(NTSC), Pattern 33(100% color Bar)

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 14 -
SIF
NTP3000
I2S
SPDIF
I2S
CVBS(NT Main)
DDR2
64MBx2
DDR2
64MBx2
Flex Bus
RGB 30 bit
TPA
Analog
Front
End USB 1.1
I2C Port0 I2C CH1
I2C CH2 I2C CH3
MTV415
Mic om
MTV415
Micom
USB (upgrade ready!!)
Dead IC when Standby
Vi d eo
Scaler
0
Vi d eo
Scaler
1 or 2
Alive IC when Standby Audio
Vid eo
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)
Latch
x2
Latchx2
24C512
24C512
Cable
A/NT
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
COMP1
Opt.
FRC94xyH
DDR1
RGB od d
RGB even
120Hz
TPB
USB 1.1 USB(EMF)
PCI
3:1
Demux
24C16
24C16
Air
MSP4450K
MSP4450K
I2S
SIF
16MB
3:1
Demux
TROUBLESHOOTING
1. VIDEO
(1) NO OSD(FHD)

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 15 -
Check L729 Check
Power conn ector 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 L VDS Cable
Check PDP/LCD Module
Control bo ard
1 2 3 4 5
1 : _Check the L729 HIGH.
_Check Power connector.
Y
NY
Y Y Y
Y
N N
2 : _Check the THC63LVD1023 (IC601) input si gnal
#(Clk) : 74.25MHz
3 : _Ch eck th e P600 input sig nal
#47(DISP_EN) : #33 (TXAC-) : 74.25MHz
3.3V GND
#32 (TXAC+) :
4 : _Check the LVDS Cable 5 : _Ch eck th e PDP Modul e co ntrol bo ard
#17 (TXBC-) :
#16 (TXBC+) :
74.25MHz
74.25MHz
74.25MHz

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 16 -
EXT
1/2
X260
TP A
Comp 1/2
RGB
CVBS
TP C
TP B / 656
AT/NT/
TUNER
TP
MST
3361 HS,VS
DVI
HS,VS
YCbCr2 YCbCr or RGB
FRC9445H
RGB
CVBS
YCbCr1
DVO
Y/C1, Y/C2
Y/C1, Y/C2
AV1/2
AV1/2
HDMI
1/2/3 TMDS341A
Check A nten na Cable
Check Tu ner
5V, Video out
Check X260 i npu ts
M_TU_CVBS(C2117)
Check CVBS Video Path
1 : _Check Tun ers Vcc and Video out
(2) VIDEO PATH
(3) RF MODE

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 17 -
EXT
1/2
X260
TP A
Comp 1/2
RGB
CVBS
TP C
TP B / 656
AT/NT/
TUNER
TP
MST
3361 HS,VS
DVI
HS,VS
YCbCr2 YCbCr or RGB
FRC9445H
RGB
CVBS
YCbCr1
DVO
Y/C1, Y/C2
Y/C1, Y/C2
AV1/2
AV1/2
HDMI
1/2/3 TMDS341A
(4) DTV / CADTV
Check A nten na Cable
Check Tuner(TU600), 5V, IF out
3._ Check X 260 Input ( CLK, SOP, Valid, Error, Data)
Check X260 INPUT CLK, SOP,
Valid, Error, Data
TPCLK
TPSOP
TPVALID
nTPERR
TPDATA[7:0]

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 18 -
EXT
1/2
X260
TP A
Comp 1/2
RGB
CVBS
TP C
TP B / 656
AT/NT/
TUNER
TP
MST
3367 HS,VS
DVI
HS,VS
YCbCr2 YCbCr or RGB
FRC9445H
RGB
CVBS
YCbCr1
DVO
Y/C1, Y/C2
Y/C1, Y/C2
AV1/2
AV1/2
HDMI
1/2/3 TMDS341A
5 : _Check the MST3361(IC402) Output Signals
(Vsync) :
(DE) :
(Clk) :
(Hsync)
59.94Hz
Freq uenc y : Different acc ordi ng to
form at !!
(Data) :
4 : _Check MS T3361(IC402) Power pins, Input Signals, Signa l Shape is S ame (abo ve)
6 : _Check X 260 (IC101) Inputs
_Signal shape is sa me (above)
Check Si gnal format
(sup port ed for mat?)
Check S TMAV335(IC403) Power
Pins, Comp1(#2,#5,#11),
Comp2(#3,#6,#10), RGB(#9,#4,#7)
RGB_V,H(R400,R401)
Check S TMAV335(IC403) outputs
#14(MUX_OUT_Y),
#13(MUX_OUT_Pb),
#8(MUX_OUT_Pr)
Check M ST3361(IC402)
OSC, Pow er pin s,#44( Y_in),
#41(Cb_in ),#46(Cr_in )
#37(H),#38(V)
1
2
3
Check M ST3361(IC402) Outputs
V-out (#99) , H-out (#98) , Clock
(#96) , Data (30Bit) , DE(#97)
Check X260 ( IC101) Inpu ts
MST3361_HS(#T6) ,
MST3361_VS(#T5) , Clock ( #P3) ,
Data (30Bit) , DE(#U6)
4
5
6
3 : Check STMAV335(IC403) outputs
Signal shape is sa me (above)
1. Check Si gnal f ormat (ref. owenrís manual)
2. Check STM AV335(IC403) Pow er Input Signal
(5) COMPONENT / RGB

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 19 -
EXT
1/2
X260
TP A
Comp 1/2
RGB
CVBS
TP C
TP B / 656
AT/NT/
TUNER
TP
MST
3367 HS,VS
DVI
HS,VS
YCbCr2 YCbCr or RGB
FRC9445H
RGB
CVBS
YCbCr1
DVO
Y/C1, Y/C2
Y/C1, Y/C2
AV1/2
AV1/2
HDMI
1/2/3 TMDS341A
1 : _Check HDCP Error
_Retr y power off and on (TV or S TB/DVD )
_Check MST3361(IC402) HDCP IIC line (#69,#70)
2 : _Check EDID Download
(RX0C-,RX0C+) : Freq uenc y : Different acc ordi ng to
form at !!
4 : _Check MST3361(IC402) Outputs
SCL :
SDA :
3 : _ MST3361(IC402) inputs
(RX1C-,RX1C+) :
(Vsync) :
(DE) :
(Clk) :
(Hsync)
59.94Hz
Freq uenc y : Different acc ordi ng to
form at !!
(Data) :
5 : _Check X 260 (IC101) Inputs
_Sign al sh ape i s s ame (abo v e)
Snow noi se (Whit e dot) ? Pow er off and on
(TV or STB/DVD)
Video is normal & No Sound ?
Check HDCP Power Pin (IC404),
MST3361(IC402) IIC(#69,#70)
Check M ST3361(IC402) inputs
Pow er, Osc
#25,#26(RX1C-,RX1C+),
#14,#15(RX0C-,RX0C+)
Re-downloa d
EDID(IC406/407/408)
Check M ST3361(IC402) Outputs
V-out (#99) , H-out (#98) ,
Clock ( #96) , Data
1
2
3
4
N
Y
N
Y
Y
Check X260 ( IC101) Inpu ts
MST3361_HS(#T6) ,
MST3361_VS(#T5) , Clock ( #P3) ,
Data (30Bit) , DE(#U6)
5
(6) HDMI / DVI

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 20 -
Symptom : T V set out of ord er on po wers
Check X300 ( 24MHz)
Norm al?
Re-downloa d
MTV416GMF (IC309 )
Norm al?
YES
NO
Replace MTV416GMF (IC309 )
and Re-download
Check SI3865(Q702) 2,3pin 5V
Normal?
Replace Power board
Normal.
Check P702 all input voltage
Normal ?
YES
Check SI3865 (Q1901
,Q1902,Q1903) 2,3pin 3.3V
Normal?
YES
Check SI3865(Q702) 5pin 3.3V
Norm al?
Check SI3865 (Q1901,Q1902
, Q1903 ) 5pin 3.3V Normal?
NO
NO
NO Check P702 wafers & connectors.
Normal ?
YES
Check P701 #3,8Pin 5V
Normal ?
YES
Replace po wer board.
NO
NO
Replace SI3865(Q702)
YES
Replace SI3865(Q1901,Q1902,Q1903 )
YES
NO
YES
Symptom : No booting
Check X300 ( 24MHz)
Norm al?
Re-downloa d
MTV416GMF (IC309 )
Norm al?
YES
Replace MTV416GMF (IC309 )
and Re-download
Check SI3865(Q702) 2,3pin 5V
Norm al?
Check SI3865 (Q1901,Q1902
,Q1903) 2,3pin 3.3V Normal?
YES
Check SI3865(Q702) 5pin 3.3V
Normal?
Check SI3865 (Q1901,Q1902,
Q1903 ) 5pin 3.3V Normal?
NO NO
Replace SI3865(Q702)
YES
Replace SI3865(Q1901,Q1902,Q1903 )
YES
NO
YES
Check SI4800( Q315)1,2,3Pin
1.9V Normal? Replace SI4800( Q315) Replace SC2621(IC304)
YES
NO
NO
Check between FB1714 and
C345 1.2V Normal? Replace SI4800( Q300,Q301) Replace SC2621(IC304)
NO
NO
NO
(7) POWER