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1-1-1 Warnings
1.For continued safety, do not attempt to modify the
circuit board.
2.Disconnect the AC power and DC Power Jack
before servicing.
1-1-2 Servicing the LCD Monitor
1. When servicing the LCD Monitor disconnect the
AC line cord from the AC outlet.
2.It is essential that service technicians have an
accurate voltage meter available at all times. Check
the calibration of this meter periodically.
1-1-3 Fire and Shock Hazard
Before returning the monitor to the user, perform the
following safety checks:
1.Inspect each lead dress to make certain that the
leads are not pinched or that hardware is not
lodged between the chassis and other metal parts in
the monitor.
2.Inspect all protective devices such as nonmetallic
control knobs, insulating materials, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacitor networks, mechanical
insulators, etc.
3.Leakage Current Hot Check (Figure 1-1):
WARNING:
Do not use an isolation transformer during this test.
Use a leakage current tester or a metering system
that complies with American National Standards
Institute (ANSI C101.1, Leakage Current for
Appliances), and Underwriters Laboratories (UL
Publication UL1410, 59.7).
Figure 1-1. Leakage Current Test Circuit
4.With the unit completely reassembled, plug the AC
line cord directly into a 120V AC outlet. With the
unit’s AC switch first in the ON position and then
OFF, measure the current between a known earth
ground (metal water pipe, conduit, etc.) and all
exposed metal parts, including: metal cabinets,
screwheads and control shafts. The current
measured should not exceed 0.5 milliamp. Reverse
the power-plug prongs in the AC outlet and repeat
the test.
1-1-4 Product Safety Notices
Some electrical and mechanical parts have special
safety-related characteristics which are often not
evident from visual inspection. The protection they give
may not be obtained by replacing them with
components rated for higher voltage, wattage, etc. Parts
that have special safety characteristics are identified by
on schematics and parts lists. A substitute
replacement that does not have the same safety
characteristics as the recommended replacement part
might create shock, fire and/or other hazards. Product
safety is under review continuously and new
instructions are issued whenever appropriate.
LW29A13W/LW40A13W1-1
CONFIDENTIAL
1 Precautions
Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as
electrical shock.
1-1 Safety Precautions
DEVICE
UNDER
TEST
TEST ALL
EXPOSED METAL
SURFACES
(READING SHOULD
NOT BE ABOVE 0.5mA)
LEAKAGE
CURRENT
TESTER
2-WIRE CORD
ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)
EARTH
GROUND
!
1-2-1 General Servicing Precautions
1.Always unplug the unit’s AC power cord from the
AC power source and disconnect the DC Power
Jack before attempting to:
(a) remove or reinstall any component or assembly,
(b) disconnect PCB plugs or connectors, (c) connect
a test component in parallel with an electrolytic
capacitor.
2.Some components are raised above the printed
circuit board for safety. An insulation tube or tape
is sometimes used. The internal wiring is
sometimes clamped to prevent contact with
thermally hot components. Reinstall all such
elements to their original position.
3. After servicing, always check that the screws,
components and wiring have been correctly
reinstalled. Make sure that the area around the
serviced part has not been damaged.
1.Immediately before handling any semiconductor
components or assemblies, drain the electrostatic
charge from your body by touching a known earth
ground. Alternatively, wear a discharging wriststrap device. To avoid a shock hazard, be sure to
remove the wrist strap before applying power to
the monitor.
2.After removing an ESD-equipped assembly, place it
on a conductive surface such as aluminum foil to
prevent accumulation of an electrostatic charge.
3.Do not use freon-propelled chemicals. These can
generate electrical charges sufficient to damage
ESDs.
4.Use only a grounded-tip soldering iron to solder or
desolder ESDs.
5.Use only an anti-static solder removal device. Some
solder removal devices not classified as “anti-static”
can generate electrical charges sufficient to damage
ESDs.
4.Check the insulation between the blades of the AC
plug and accessible conductive parts (examples:
metal panels, input terminals and earphone jacks).
5.Insulation Checking Procedure: Disconnect the
power cord from the AC source and turn the power
switch ON. Connect an insulation resistance meter
(500 V) to the blades of the AC plug.
The insulation resistance between each blade of the
AC plug and accessible conductive parts (see
above) should be greater than 1 megohm.
6.Always connect a test instrument’s ground lead to
the instrument chassis ground before connecting
the positive lead; always remove the instrument’s
ground lead last.
6.Do not remove a replacement ESD from its
protective package until you are ready to install it.
Most replacement ESDs are packaged with leads
that are electrically shorted together by conductive
foam, aluminum foil or other conductive materials.
7.Immediately before removing the protective
material from the leads of a replacement ESD,
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 body motions when handling
unpackaged replacement ESDs. Motions such as
brushing clothes together, or lifting your foot from
a carpeted floor can generate enough static
electricity to damage an ESD.
Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly
called Electrostatically Sensitive Devices (ESD). Examples of typical ESD are integrated circuits and some field-effect
transistors. The following techniques will reduce the incidence of component damage caused by static electricity.
1-2 Servicing Precautions
WARNING:An electrolytic capacitor installed with the wrong polarity might explode.
Caution:Before servicing units covered by this service manual, read and follow the Safety Precautions
section of this manual.
Note:If unforeseen circumstances create conflict between the following servicing precautions and any of the
safety precautions, always follow the safety precautions.
CONFIDENTIAL
LCD Panel
TFT-LCD panel, RGB vertical stripe, normally black TFT-LCD panel, RGB vertical stripe, normally black
Level : TMDS
Maximum Pixel Clock rate90 MHz
Active Display (H / V)
AC power voltage & FrequencyAC 200 ~ 260 VAC, 60~50 Hz ± 3 Hz
Power Consumption150W (max)230W (max)
Dimensions
Set
29.9 x 22.4 x 7.7 Inches (759.6 x 568.5 x 195 mm)
39.6x 28.1 x 2.3 Inches (1006 x 713 x 58 mm)
Speaker L/R22.5 x 5.1 x 6.1 Inches (570.5 x 130 x 155 mm)30.5 x 6.7 x 9.1 Inches (744 x 170 x 230 mm)
Wall/Mount-kit28.6 x 15.7 x 3.7 Inches (727 x 400 x 94 mm)37.8 x 15.7 x 3.7 Inches (960 x 400 x 94 mm)
Stand37.6 x 1.3 x 11.8 Inches (956 x 33.4 x 300 mm)
Weight
Set13.7 kg (30.2 lbs) 21.5 kg (47.4 lbs)
Speaker L/R2.4 kg (5.2 lbs)4.9 kg (10.8 lbs)
Wall/Mount-kit4.9 kg (10.8 lbs) 5.7 kg (12.6 lbs)
Stand5.6 kg (12.3 lbs)
Environmental ConsiderationsOperating Temperature : 50°F ~ 104°F (10°C ~ 40°C)
This section of the service manual describes the timing that the computer industry recognizes as standard
for computer-generated video signals.
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2-3-1 LCD Panel Mode : 1 mode
2 Product Specifications
2-4LW29A13W/LW40A13W
CONFIDENTIAL
2-3-2 Supported Modes (1)
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2 Product Specifications
LW29A13W/LW40A13W2-5
CONFIDENTIAL
2-3-2 Supported Modes (2)
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2 Product Specifications
2-6LW29A13W/LW40A13W
CONFIDENTIAL
2-3-2 Supported Modes (1)
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LW29A13W/LW40A13W3-1
CONFIDENTIAL
3 Disassembly and Reassembly
This section of the service manual describes the disassembly and reassembly procedures for the
LW29A13W/LW40A13W monitor.
WARNING: This monitor contains electrostatically sensitive devices. Use caution when handling
these components.
3-1 Disassembly
Cautions:1. Disconnect the monitor from the power source before disassembly.
2. Follow these directions carefully; never use metal instruments to pry apart the cabinet.
1. Remove 4 screws of the cover rear.
2. Remove the stand from LCD-TV.
3 Disassembly and Reassembly
3-2LW29A13W/LW40A13W
CONFIDENTIAL
3. Remove 4 screws of the cover rear.
4.Pull the cover rear.
3-2 Reassembly
Reassembly procedures are in the reverse order of Disassembly procedures.
CONFIDENTIAL
LW29A13W/LW40A13W4-1
4 Alignments and Adjustments
This section of the service manual explains how to use the DDC JIG to adjust the black, red, green, and blue
levels of the FPD when you replace the AD Board, and how to update the microprocessor when you
change the Panel or Lamp(s).
4-1 General Alignment Instruction
1. Usually, a color TV-VCR needs only slight touch-up adjustment upon installation.
Check the basic characteristics such as height, horizontal and vertical sync.
2. Use the specified test equipment or its equivalent.
3. Correct impedance matching is essential.
4. Avoid overload. Excessive signal from a sweep generator might overload the front-end
of the TV. When inserting signal markers,do not allow the marker generator to distort
test result.
5. Connect the TV only to DC power source with voltage and frequency as specified on
the backcover nameplate.
6. Do not attempt to connect or disconnect any wire while the TV is turned on. Make sure
that the power cord is disconnected before replacing any parts.
7. To protect aganist shock hazard,use an isolation transform.
4-2 Adjustment Procedures
Use the following procedures whenever you replace the AD Board, Panel, or one or both of the Lamps.
4-2-1 (a) Color Auto Adjustment
1. After displaying 16-Gray pattern of XGA mode press channel “+”, ”–”, and “menu” buttons.
2. During normal execution of Auto Algorithm the screen image may change. If Auto Algorithm does
not excute properly, try one more.
3. After normal execution of Auto Algorithm, confirm optimal settings by observing the contrast of
several different patterns on the display.
Memo
4 Alignments and Adjustments
4-2LW29A13W/LW40A13W
CONFIDENTIAL
CONFIDENTIAL
LW29A13W/LW40A13W5-1
5 Troubleshooting
Does proper DC 28 V appear at
DC jack connected to CN112?
Check SMPS PCB and Adapter.
Yes
No
Does proper DC 5 V appear
at Pin 1 of IC849 and Pin 2 of
IC828, IC830, IC852?
Check IC849, IC830 and IC828, IC852.
Check IC811 and IC817.
Yes
No
Does proper DC 2.5 V appear at
Pin 2 of IC804, IC806 and IC807?
Check IC804, IC806 and IC807
.
Yes
No
Does proper DC 3.3 V appear at
Pin 2 of IC800, IC801 and IC805?
Check IC800, IC801 and IC805.
Yes
No
Does proper DC 12 V appear at
Pin 2 of IC829?
Check IC829.
Yes
No
5-1 No Power
CONFIDENTIAL
5 Troubleshooting
5-2LW29A13W/LW40A13W
5-2 No Video (PC Analog Signal)
Power indicator is green
Does the signal appear at
Pin 7, 15 and 22 of IC203?
Check the R, G, B signal line and
related the R, G, B signal line.
Yes
No
Does the clock pulse appear at
Pin 30 and 31 of IC203?
Check IC203 and related circuit of IC203.
Yes
No
Does the colck pluse
appear at Pin 4, 10 of IC838?
Check related circuit of IC838.
Yes
No
Replace LCD Panel.
CONFIDENTIAL
5 Troubleshooting
LW29A13W/LW40A13W5-3
5-3 No Video (PC Digital Signal)
Power indicator is green
Does the signal appear at
Pin 80, 81, 85, 86, 90, 91,
93 and 94 of IC833?
Yes
No
Does the signal
appear at RA603, RA631,
RA632 and RA633?
Check IC833 and related circuit of IC833.
Check R2018, 2019, 2020, 2021,
2022, 2023, 2024 and 2025.
No
Yes
Replace LCD Panel.
5-4 No Picture (CVBS, S-VHS, Scart Video)
Check Pin 13, 15 (RF_CVBS1,
FR_CVBS2) of CN622?
Pin 9 (Scart1_Vin) of CN601
Pin 9 (Scart2_Vin) of CN621