LG 26LX2D-UA User manual

LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : AL-04DA
MODEL : 26LX2D-UA
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html

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CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
SPECIFICATION........................................................................................6
ADJUSTMENT INSTRUCTION ...............................................................10
SVC REMOCON ......................................................................................12
TROUBLE SHOOTING............................................................................13
BLOCK DIAGRAM...................................................................................16
WIRING DIAGRAM..................................................................................18
EXPLODED VIEW .................................................................................. 19
EXPLODED VIEW PARTS LIST..............................................................20
REPLACEMENT PARTS LIST ............................................................... 21
SVC. SHEET ...............................................................................................

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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
X-RADIATION, 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

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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

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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.

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1. Application range
This specification is applied to AL-04DA chassis.
2. Requirement for Test
Testing for standard of each part must be followed in below
condition.
(1) Temperature: 20°C ± 5°C
(2) Humidity : 65 ± 10%
(3) Power: Standard input voltage (AC 110-240V, 50/60Hz)
*Standard Voltage of each product 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 and Inspection Method
3.1 Performance : LGE TV test method followed.
3.2 Demanded other specification.
EMI : FCC Class B, IC Class B
SAFETY : UL1492, CSA, C22, No.1
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
4. General Specification
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 ~ 260V 50/60Hz
4. Market NORTH AMERICA
5. Screen Size 26 inch Wide
6. Aspect Ratio 16:9
7. Tuning System FS
8. LCD Module LC260WX2-SL03 (1366 x 768) LPL
9. Operating Environment 1) Temp : 0 ~ 40 deg
2) Humidity : ~ 80 %
10. Storage Environment 1)Temp : -20 ~ 60 deg
2) Humidity : 0 ~ 90 %

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RGB Iinput (PC/DTV)
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed
PC DDC
1 640 x 350 31.468 70.09 25.17 EGA O
2 640 x 350 37.861 85.08 31.50 EGA O
3 720 x 400 31.469 70.08 28.32 DOS O
4 720 x 400 37.927 85.03 35.50 DOS O
5 640 x 480 31.469 59.94 25.17 VESA(VGA) O
6 640 x 480 37.861 72.80 31.50 VESA(VGA) O
7 640 x 480 37.500 75.00 31.50 VESA(VGA) O
8 640 x 480 43.269 85.00 36.00 VESA(VGA) O
9 800 x 600 35.156 56.25 36.00 VESA(SVGA) O
10 800 x 600 37.879 60.31 40.00 VESA(SVGA) O
11 800 x 600 48.077 72.18 50.00 VESA(SVGA) O
12 800 x 600 46.875 75.00 49.50 VESA(SVGA) O
13 800 x 600 53.674 85.06 56.25 VESA(SVGA) O
14 1024 x 768 48.363 60.00 65.00 VESA(XGA) O
15 1024 x 768 56.476 70.06 75.00 VESA(XGA) O
16 1024 x 768 60.023 75.02 78.75 VESA(XGA) O
DTV
17 704 x 480 31.47 59.94 SDTV 480P
18 1280 x 720 45.00 60.00 HDTV 720P
19 1280 x 720 44.96 59.94 HDTV 720P
20 1920 x 1080 33.75 60.00 HDTV 1080I
21 1920 x 1080 33.72 59.94 HDTV 1080I
5. External Input Format
Component Video Input (Y, CB/PB, CR/PR)
No Resolution H-freq(kHz) V-freq.(kHz) Pixel clock Proposed
1 640 x 480 15.73 60 SDTV ,DVD 480I
2 704 x 480 31.47 59.94 SDTV 480P
3 1280 x 720 45.00 60.00 HDTV 720P
4 1280 x 720 44.96 59.94 HDTV 720P
5 1920 x 1080 33.75 60.00 HDTV 1080I
6 1920 x 1080 33.72 59.94 HDTV 1080I

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HDMI Input (PC/DTV)
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed
1 PC DDC
2 640 x 480 31.469 59.94 25.17 VESA(VGA) O
3 640 x 480 37.861 72.80 31.50 VESA(VGA) O
4 640 x 480 37.500 75.00 31.50 VESA(VGA) O
5 800 x 600 35.156 56.25 36.00 VESA(SVGA) O
6 800 x 600 37.879 60.31 40.00 VESA(SVGA) O
7 800 x 600 48.077 72.18 50.00 VESA(SVGA) O
8 800 x 600 46.875 75.00 49.50 VESA(SVGA) O
9 1024 x 768 48.363 60.00 65.00 VESA(XGA) O
10 1024 x 768 56.476 70.06 75.00 VESA(XGA) O
11 1024 x 768 60.023 75.02 78.75 VESA(XGA) O
DTV
12 720 x 480 31.500 60 27.03 SDTV 480P O
13 720 x 480 31.469 59.94 27.00 SDTV 480P O
14 1280 x 720 45.000 60.00 74.25 HDTV 720P O
15 1280 x 720 44.955 59.94 74.175 HDTV 720P O
16 1920 x 1080 33.750 60.00 74.175 HDTV 1080I O
17 1920 x 1080 33.716 59.94 74.25 HDTV 1080I O

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6. General spec(Module)
No Item Min Typ Max Unit Remark
1 Active Screen Size 600.53(diagonal) mm 26.005 inches
2 Outline Dimension 626(H) x 373(V) x 44.1(D) mm Typ.
3 Pixel Pitch 147.5 x 421.5 x RGB
4 Pixel Format 1366(H)x768(V) RGB stripe arrangement
5 Color Depth 8bit 16.7 Mbit
6 Luminance ,White 500 cd/m2 Center 1 point
7 Viewing Angle (CR>10) R/L 178(Typ),U/P 178(Typ) degree
8 Power Consumption 71.6 Watt Typ.
9 Weight 5.0 kg
10 Display Operating Mode Transmissive mode ,normally black
11 Surface Treatment Hard coating (3H), Anti-glare treatment
12 Altitude Operating 0 - 14,000 feet 4,267.2 m
Storage/Shipment 0 - 40,000 feet 12,192.0 m
13 Lamp Life Time 50,000 (min.) Hrs 25±2°C

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1. Applicability
These specifications are applicable for all PDP TV models
with an AL-04DA chassis that are manufactured by the
Manufacturing Group of the Display Business Division, or
any of its related manufacturers.
2. Specifications
2.1 This chassis is the non-charging type chassis for
which the power unit is insulated. Therefore, the
insulated type transformer is not required but it is
recommended that it be used between the power
supply line and chassis input side before running the
chassis, in order to protect the adjustment equipment.
2.2 Adjustment should be made in the correct sequence.
However, the order can be changed for mass
production purposes.
2.3 The suggested surrounding temperature is 25±5°C,
and suggested relative humidity is 65±10% for the
adjustment of the chassis, unless specified.
2.4 The input voltage should be maintained at 110V and
60MHz.
2.5 The receiver should run for about 15 minutes before
starting adjustment, unless specified.
- Run prior operation after receiving 100% White
pattern (06CH).
(OR, 9. White Pattern state in Ez-Adjust.)
- How to enter into the White Pattern
1) Press the Power ON key in the adjustment remote
control.
2) Or, press the ADJ key on the adjustment remote
control to enter into Ez-Adjust and select 9. White
Pattern using CH +/- key. Then, press the OK ( )
key to display 100% Full White Pattern.
* In this mode, the SET can be put on HEAT RUN
without a separate signal generator.
Note) If you leave the stop image on for more than 20
minutes, you must be careful because an
afterimage will appear on the black level section.
(Applies to internal digital pattern (13CH) and cross
hatch pattern (09CH) with clear black/white
contrast, in particular).
3. Full assembly process adjustment
<Precaution>
Each PCB assembly must be checked using the check jig set
before the full assembly process. (The power PCB assembly
can damage the LCD module irreparably.)
3.1. Extended Display Identification Data (EDID) and
Display Data Channel (DDC) download
3.1.1 Overview
Developed by VESA, the EDID function is designed
to support the "plug & play" function, which enables
the computer to configure the user environment
automatically through communication with the
monitor.
3.1.2 Entering the HDMI EDID Data
1) Equipment
- PC and DDC adjustment jig (PC serial to D-sub
connection device)
- DDC recording software (EDID data write & read)
- D-Sub terminal
- Need separate HDMI cable connection jig.
3.2. Adjusting AD9883A-Set
3.2.1. Overview
AD9883A-Set adjustment automatically sets the
optimal black level, and readjusts the RGB
differences in analog -> digital converter.
Adjustment is made separately for the component
mode and RGB-DTV mode input.
3.2.2. Equipment
Adjustment remote control: 801GF (802B, 802F,
802R) or MSPG925FA Pattern Generator(It should
support 720P horizontal 100% color bar patter
display, and the output level should be accurately
corrected to 0.7±0.1Vp-p.)
Adjustment pattern: 720P/60Hz HozBar Pattern
(Format No. 217, Pattern No. 65)
3.2.3 Signal input method
Connect the component output and RGB D-Sub
output of the Pattern Generator to the component 1
and RGB D-Sub jack of the set.
ADJUSTMENT INSTRUCTION

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3.2.4. Adjustment method
A)When entering the component, input 100%
Horizontal Color Bar Pattern (HozTV30Bar) of the
supportable 720P mode, and select Component 1
or Component 2 input, and select Normal image.
B) Wait for at least one second after receiving the
signal and press the ADJ key on the adjustment
remote control to enter into Ez-Adjust. Then, select
"1. AD9883A-Set" and press the + key for
automatic adjustment.
C)If adjustment is completed successfully, the
"AD9883A Component Success" message will be
displayed. Otherwise, the "AD9883A Configuration
Error" message will be displayed.
D)If the adjustment for component AD9883A is
finished, it will automatically switch to RGB-DTV
mode, and the above-mentioned pattern will be
displayed. If adjustment is successfully completed,
"AD9883A RGB_DTV Success" message will be
displayed.
E) If adjustment is not completed successfully, check
the pattern or adjustment condition and try again.
F) If adjustment is completed successfully, press the
ADJ key to exit from the adjustment mode.
3.3. Adjusting White Balance
3.3.1 Equipment
- Color Analyzer (CA-100 or equivalent item)
- Automatic adjustment device (Needed for automatic
adjustment. It should support RS-232C
communication, Baud rate: 115,600)
- Pattern Generator (MSPG-925FA): Equipment with
DVI output.
- Pattern: High light 80% Full White
3.3.2 Measurer Connection Diagram (Automatic
adjustment)
Connection diagram for 32LX1D-U automatic
adjustment
Note) RS-232C Commands used for automatic
adjustment.
3.3.3. Manual White Balance Adjustment
When adjusting after carrying out zero calibration for
CA-100, the sensor should be tightly fixed on the
LCD module surface. Take the following steps for
manual adjustment.
A) Press the ADJ key on the adjustment remote
control to enter into "Ez-Adjust."
B) Select "9. White Pattern" using CH +/- key and
press the OK key. Then, perform Heat Run for
more than 30 minutes.
C) Make the Digital Pattern Generator supply Full
White Pattern signal.
(Connect the external input to "HDMI".)
D) Fix the sensor to the screen center and press the
ADJ key on the adjustment remote control to
select "6. White balance" in "Ez-Adjust". Then,
press the right direction key ( ) to enter into the
adjustment mode.
E) Adjust the high light using R Gain, G Gain, and B
Gain.
F) Use Volume +/- key for adjustment.
3.3.4. Adjustment Target value
- Brightness value
- Target value
X coordinate value / White balance / Special items /
Fix B-Gain.
3.4 Video (uPD) - Automatic Set Adjustment
This automatic adjustment function narrows the color
difference between the main and sub screen of the RF
and video signal. Adjustment is made for both RF
mode and video 1 mode. The signal source of RF is
internal 02Ch, and the signal source for video 1 is
100% full color bar.
3.5 RS232C Operation Check
Press In-start in the adjustment remote control and
enter '6. Baud Rate' menu. Then, change the baud
rate to 9600 and check RS232C operation.

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SVC REMOCON
NO KEY FUNTION REAMARK
1 POWER
2 POWER ON
3 MUTE
4 P-CHECK
5 S-CHECK
6 ARC
7 CAPTION
8 TXT
9 TV/AV
10 TURBO SOUND
11 TURBO PICTURE
12 IN-START
13 ADJ
14 MPX
15 EXIT
16 APC(PSM)
17 ASC(SSM)
18 MULTIMIDIA
19 FRONT-AV
20 CH
21 VOL
22 ENTER
23 PIP CH-(OP1)
24 PIP CH+(OP2)
25 PIP SWAP(OP3)
26 PIP INPUT(OP4)
27 EYE
28 MENU
29 IN-STOP
30 STILL
31 TIME
32 SIZE
33 MULTI PIP
34 POSITION
35 MODE
36 PIP
37 TILT
38 0~9
To turn the TV on or off
To turn the TV on automatically if the power is supplied to the TV. (Use the
POWER key to deactivate): It should be deactivated when delivered.
To activate the mute function.
To check TV screen image easily.
To check TV screen sound easily
To select size of the main screen (Normal, Spectacle, Wide or Zoom)
Switch to closed caption broadcasting
To toggle on/off the teletext mode
To select an external input for the TV screen
To start turbo sound
To start turbo picture
To enter adjustment mode when manufacturing the TV sets.
To adjust the screen voltage (automatic):
In-start mute Adjust AV(Enter into W/B adjustment mode)
W/B adjustment (automatic):
After adjusting the screen W/B adjustment Exit two times (Adjustment completed)
To enter into the adjustment mode. To adjust horizontal line and sub-brightness.
To select the multiple sound mode (Mono, Stereo or Foreign language)
To release the adjustment mode
To easily adjust the screen according to surrounding brightness
To easily adjust sound according to the program type
To check component input
To check the front AV
To move channel up/down or to select a function displayed on the screen.
To adjust the volume or accurately control a specific function.
To set a specific function or complete setting.
To move the channel down in the PIP screen.
To use as a red key in the teletext mode
To move the channel in the PIP screen
To use as a green key in the teletext mode
To switch between the main and sub screens
To use as a yellow key in the teletext mode
To select the input status in the PIP screen
To use as a blue key in the teletext mode
To set a function that will automatically adjust screen status to match
the surrounding brightness so natural color can be displayed.
To select the functions such as video, voice, function or channel.
To set the delivery condition status after manufacturing the TV set.
To halt the main screen in the normal mode, or the sub screen at the PIP screen.
Used as a hold key in the teletext mode (Page updating is stopped.)
Displays the teletext time in the normal mode
Enables to select the sub code in the teletext mode
Used as the size key in the PIP screen in the normal mode
Used as the size key in the teletext mode
Used as the index key in the teletext mode (Top index will be
displayed if it is the top text.)
To select the position of the PIP screen in the normal mode
Used as the update key in the teletext mode (Text will be
displayed if the current page is updated.)
Used as Mode in the teletext mode
To select the simultaneous screen
To adjust screen tilt
To manually select the channel.
Shortcut keys
Shortcut keys
Shortcut keys
Use the AV
key to enter
the screen
W/B
adjustment
mode.
Shortcut keys
Shortcut keys
Shortcut keys

- 13 -
TROUBLESHOOTING
No power
Connect the
connectors.
Replace Power_board
Push the
POWER ON key
O.K
Check
the condition of power
Related connectors. FAIL
FAIL
FAIL
FAIL
FAIL
FAIL
FAIL
FAIL
PASS
PASS
PASS
PASS
PASS
Measure the
stand_by voltage :
D_board P1401 5th pin
ST_ 6V
Check the
power board
Digital ref. voltage :
Power board
CN804 1th pin 24V
Replace the
Power_board
Replace Power board
Replace D_board
Measure D_board
Standby voltage :
D_board P818
6 pin 6V
Check
Power_board analog ref.
voltage A_board
P801 1th pin 24V
Measure
Power On signal level :
A_board P801
2nd pin > 5V
Measure
D_board supply voltage :
P1402 1th pin 3V
8th 6V, 10th 12V
Dose the
set turn on normally?

- 14 -
No raster
Replace D_board
Replace A_board
Standby
voltage check :
D_board P1401 5th 6V Check No power
(Go to No power)
Check No power
(Go to No power)
FAIL
FAIL
PASS
PASS
PASS
PASS
PASS
Measure
Standby voltage :
A_board P804 7th 6V
Measure
Standby voltage :
A_board P801
2nd pin 5V
Measure
module T-con voltage :
D_board C933 12V
Measure
D_board supply voltage :
P1402 1th pin 3V
8th 6V, 10th 12V
Measure
Analog supply :
A_board P804 7th 6V,
10,11th 3.3V
Check No power
(Go to No power)
FAIL
FAIL
Replace D_board
FAIL
Replace A_board
FAIL
PASS
Replace A_board
PASS
Replace D_board
PASS

- 15 -
No sound
Replace A_board
Replace Speaker
Replace
D_power_board
Check Sound supply:
A_board P804 #1, 18V
Speaker
output check :
Is there waveform
of P601 #1?
Measure
A_power board
trans output:
18V at power_board
CN803 #1
Check
If A_board 18V
is short-circuited.
Resistance btween A_board
P821 Pin No.2
and 3 infnity?
FAIL
PASS
PASS
FAIL
FAIL
Replace A_board
FAIL

BLOCK DIAGRAM
- 16 -

BLOCK DIAGRAM DESCRIPTION
- 17 -
In this system there are 2 tuners - ATSC/NTSC tuner(TDVS-H701P) and NTSC-only tuner.(TAFM-H103P)
So it is impossible to have a digital (main)/digital (sub) PIP.
CXA2181Q is the AV switch for the component signals and CXA2069Q is the AV switch for the composite signals.
The audio signals which separated by CXA2069 are sent to MSP4440.
AD9883 is AD converter and there are 2 NT decoders (uPD64011B) for main and sub NT signals each.
Gemstar is TV Guide On Screen system which provides program listings for cable-ready, cable box, and digital cable services as well
as over-the-air broadcast. And it needs 2 micoms (PIC18F242 is for IR blast and PIC18F1220 is for VBI slicing).
HD2.3 can receive TP data, MPEG2 video decoding and image processing. IEP2 chip enhances the output image quality.
Main CPU (PPC405GPr-266) is the central processing IC, which controls most of the ICs.
CPLD (XC95288, XC95144) implements the glue-logic.
SATA Link(Sil3512) converts the SATA I/F to PCI for the EPF(memory card I/F) data. This TV will display images or play
music from a memory card(CF,SD,xD, MMC etc.)
1394 communicates to either direction and can give and take image, sound, or each control commands with only one cable (this TV
can communicate with DVHS / Camcoder).
HDMI port can receive video data via High-Definition Multimedia Interface (HDMI) or the Digital Visual Interface (DVI).
Sil9012 is HDMI receiver IC and TSB43DA42 controls the 1394 I/F.
This TV is capable of receiving basic analog, digital basic and digital premium cable television programming by direct connection to a
cable system providing such programming. A security card provided by cable operator (CableCard) is required to view encrypted digital
programming. Channel informations can receive in the OOB channel.
LGDT3701A demodulates the VSB/QAM signals and also OOB signal (QPSK).
LGDT3502B generates the CableCard I/F signals and decodes copy protected stream.

- 18 -
13
12
9
4
5
14
15
10
11 11 11
3
2
7
6
1
19
18
8
20
17
21 22
16
WIRING DIAGRAM
Wiring Part List
NO. PART NO.
1 2 3 4 5
6631T11020Z
6631T20037L
6631T20037M
6631T20037P 6631T20037S
6631T25019B 6631T25019V 6631T25024E 6631T25024K
6631T25024J
6631V10004A
6631T25023Z
6631T20037D 6631T20037R
6631T25024F
6631T25024N
6631T25024M
6631T20010F
6850U00002D
6631T20038D
6631T20033R
6631T25024L
6 7 8 9
10
11 12 13 14 15
16 17 18 19 20
21 22
NO. PART NO. NO. PART NO. NO. PART NO. NO. PART NO.

- 19 -
EXPLODED VIEW
010
120
110 130 150
180
170
140 160
190 200 210
040
020 060
070 080
130 090 100 030
050

- 20 -
EXPLODED VIEW PARTS LIST
No. PART NO. DESCRIPTION
3091TKE039B Cover Assembly, 26LX2D BRAND DU SET AL-04DA
3091TKE039C Cover Assembly, 26LX2D BRAND DU C/SKD
6304FLP190A
LCD,Module-TFT, LC260WX2-SL03 DRIVER 26.0INCH 1366X768 500CD COLOR - - 600VS1 - LG PHILIPS LCD
3809TKE029H Cover Assembly, 26LX1D-UA AL-04DA NO SPRAY
3809TKE029K Cover Assembly, 26LX1D-UA NON NO SPRAY,C/SKD
3043TKK248B Base Assembly, 26LX2D-DU STAND ASSY
3043TKK248C Base Assembly, 26LX2D-DU STAND ASSY C/SKD
3550TKK875B Cover, MOLD ABS 26LX2D REAR A/V NO SPRAY
4951TKS211A Plate Assembly, FRAME MAIN ASSY, DU-26LG10
4951TKS211C Plate Assembly, FRAME MAIN ASSY, 26LX1D C/SKD
6871TPT303B PCB Assembly,Power, POWER T.T DU(DCR) COMM - SH(D112) DU/DN/DI-32LP10 BRAND
6871TST939A PCB Assembly,Sub, SUB T.T ETC 26LX1D-U TUNER BRAND -
3313TD2006A Main Total Assembly, 26LX2D-UA DIGITAL BRAND AL-04DA
4951TKK258A Plate Assembly, SHIELD 26LX1D
4951TKK258D Plate Assembly, SHIELD 26LX1D-UA C/SKD
6871TSTA48A PCB Assembly,Sub, CONTROL T.T ETC 26/32LX1D-UA KEY BRAND -
6871TST937A PCB Assembly,Sub, SUB T.T ETC 26LX1D-U IR&LIGHT BRAND -
EAB30827201
Speaker,Fullrange, C112K01K1450. FERRITE 15W 8OHM 83.5DB 170HZ 116 X 42 X 38.5 LUG
6871TST934B PCB Assembly,Sub, INTERFACE T.T NON 26LX1D-U EPF 26LX1D-U -
or 6871TST934A PCB Assembly,Sub, INTERFACE T.T ETC 26LX1D-U EPF BRAND -
6871TST940A PCB Assembly,Sub, SUB T.T ETC 26LX1D-U AUDIO BRAND -
4810TKK302A Bracket, MOLD HIPS DU-26LG10 REAR BARCKET, EPF
4951TKK262A Plate Assembly, SUPPORT FAN ASSY 5900V05005A
or 4951TKK262B Plate Assembly, SUPPORT FAN ASSY 5900V05005B
6871TST938A PCB Assembly,Sub, SUB T.T ETC 26LX1D-U SIDE BRAND -
3313TD2005A Main Total Assembly, 26LX2D-UA ANALOG BRAND AL-04DA
4950TKA191A Plate PRESS SBHG T1.2 REAR SHIELD, DU-26LG10
4950TKA191B Plate PRESS SBHG T1.2 REAR SHIELD, DU-26LX1D C/SKD
3551TKK572F Cover Assembly, 26LX1D-UA REAR ML-051A A/V ASSY NO SPRAY
010
020
030
040
050
060
070
080
090
100
110
120
130
140
150
160
170
180
190
200
210