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CONFIDENTIAL
LCD-TV
Chassis Model
AL29AO LW29A13W
AL40AO LW40A13W
SERVICE Manual
LCD-TV CONTENTS
1. Precautions
2. Product Specifications
3. Disassembly & Reassembly
4. Alignment & Adjustments
5. Troubleshooting
6. Exploded View & Parts List
7. Electrical Parts List
8. Block Diagram
9. Wiring Diagram
10. Schematic Diagrams
11. Panel Description
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
1-1-1 Warnings
1. For continued safety, do not attempt to modify the
(READING SHOULD
circuit board. NOT BE ABOVE 0.5mA)
2. Disconnect the AC power and DC Power Jack
before servicing. DEVICE
LEAKAGE
CURRENT
UNDER TESTER
1-1-2 Servicing the LCD Monitor TEST
TEST ALL
EXPOSED METAL
1. When servicing the LCD Monitor disconnect the SURFACES
AC line cord from the AC outlet.
2-WIRE CORD
2. It is essential that service technicians have an
accurate voltage meter available at all times. Check
the calibration of this meter periodically. ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED) EARTH
1-1-3 Fire and Shock Hazard GROUND
Before returning the monitor to the user, perform the Figure 1-1. Leakage Current Test Circuit
following safety checks:
1. Inspect each lead dress to make certain that the 4. With the unit completely reassembled, plug the AC
leads are not pinched or that hardware is not line cord directly into a 120V AC outlet. With the
lodged between the chassis and other metal parts in unit's AC switch first in the ON position and then
the monitor. OFF, measure the current between a known earth
2. Inspect all protective devices such as nonmetallic ground (metal water pipe, conduit, etc.) and all
control knobs, insulating materials, cabinet backs, exposed metal parts, including: metal cabinets,
adjustment and compartment covers or shields, screwheads and control shafts. The current
isolation resistor-capacitor networks, mechanical measured should not exceed 0.5 milliamp. Reverse
insulators, etc. the power-plug prongs in the AC outlet and repeat
3. Leakage Current Hot Check (Figure 1-1): the test.
WARNING:
Do not use an isolation transformer during this test. 1-1-4 Product Safety Notices
Use a leakage current tester or a metering system
Some electrical and mechanical parts have special
that complies with American National Standards
safety-related characteristics which are often not
Institute (ANSI C101.1, Leakage Current for evident from visual inspection. The protection they give
Appliances), and Underwriters Laboratories (UL may not be obtained by replacing them with
Publication UL1410, 59.7). 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/LW40A13W 1-1
1 Precautions
CONFIDENTIAL
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.
1-2-1 General Servicing Precautions
1. Always unplug the unit's AC power cord from the 4. Check the insulation between the blades of the AC
AC power source and disconnect the DC Power plug and accessible conductive parts (examples:
Jack before attempting to: metal panels, input terminals and earphone jacks).
(a) remove or reinstall any component or assembly, 5. Insulation Checking Procedure: Disconnect the
(b) disconnect PCB plugs or connectors, (c) connect power cord from the AC source and turn the power
a test component in parallel with an electrolytic switch ON. Connect an insulation resistance meter
capacitor. (500 V) to the blades of the AC plug.
2. Some components are raised above the printed The insulation resistance between each blade of the
circuit board for safety. An insulation tube or tape AC plug and accessible conductive parts (see
is sometimes used. The internal wiring is above) should be greater than 1 megohm.
sometimes clamped to prevent contact with
6. Always connect a test instrument's ground lead to
thermally hot components. Reinstall all such
the instrument chassis ground before connecting
elements to their original position.
the positive lead; always remove the instrument's
3. After servicing, always check that the screws, ground lead last.
components and wiring have been correctly
reinstalled. Make sure that the area around the
serviced part has not been damaged.
1-3 Electrostatically Sensitive Devices (ESD) Precautions
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. Immediately before handling any semiconductor 6. Do not remove a replacement ESD from its
components or assemblies, drain the electrostatic protective package until you are ready to install it.
charge from your body by touching a known earth Most replacement ESDs are packaged with leads
ground. Alternatively, wear a discharging wrist- that are electrically shorted together by conductive
strap device. To avoid a shock hazard, be sure to foam, aluminum foil or other conductive materials.
remove the wrist strap before applying power to 7. Immediately before removing the protective
the monitor. material from the leads of a replacement ESD,
2. After removing an ESD-equipped assembly, place it touch the protective material to the chassis or
on a conductive surface such as aluminum foil to circuit assembly into which the device will be
prevent accumulation of an electrostatic charge. installed.
3. Do not use freon-propelled chemicals. These can Caution: Be sure no power is applied to the
generate electrical charges sufficient to damage chassis or circuit and observe all
ESDs. other safety precautions.
4. Use only a grounded-tip soldering iron to solder or
desolder ESDs. 8. Minimize body motions when handling
unpackaged replacement ESDs. Motions such as
5. Use only an anti-static solder removal device. Some brushing clothes together, or lifting your foot from
solder removal devices not classified as "anti-static" a carpeted floor can generate enough static
can generate electrical charges sufficient to damage electricity to damage an ESD.
ESDs.
1-2 LW29A13W/LW40A13W
CONFIDENTIAL
2 Product Specifications
2-1 Specifications
Description
Item
LW29A13W LW40A13W
LCD Panel TFT-LCD panel, RGB vertical stripe, normally black TFT-LCD panel, RGB vertical stripe, normally black
transmissive, (29-Inch) viewable, 0.27 pixel pitch transmissive, (39.6-Inch) viewable, 0.27 pixel pitch
Scanning Frequency Horizontal : 30 KHz ~ 61 KHz (Analog) Vertical : 56 Hz ~ 75 Hz
Display Colors 16,777,216 Million colors
Maximum Resolution Horizontal : 1280 Pixels Vertical : 768 Pixels
Input Video Signal Digital, 0.7 Vp-p ± 5% positive at 75 , internally terminated
Input Sync Signal Type : Seperate H/V sync, Composite H/V, Sync-on-Green
Level : TMDS
Maximum Pixel Clock rate 90 MHz
Active Display (H / V) 518.4 ± 3 mm / 324 ± 3 mm
AC power voltage & Frequency AC 200 ~ 260 VAC, 60~50 Hz ± 3 Hz
Power Consumption 150W (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/R 22.5 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-kit 28.6 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)
Stand 37.6 x 1.3 x 11.8 Inches (956 x 33.4 x 300 mm)
Weight
Set 13.7 kg (30.2 lbs) 21.5 kg (47.4 lbs)
Speaker L/R 2.4 kg (5.2 lbs) 4.9 kg (10.8 lbs)
Wall/Mount-kit 4.9 kg (10.8 lbs) 5.7 kg (12.6 lbs)
Stand 5.6 kg (12.3 lbs)
Environmental Considerations Operating Temperature : 50°F ~ 104°F (10°C ~ 40°C)
Humidity : 10 % ~ 80 %
Storage Temperature : -4°F ~ 113°F (-20°C ~ 45°C)
Humidity : 5 % ~ 95 %
Tunning Frequency Synthesize
TV System
Color PAL, SECAM, NTSC4.43
Sound B/G, D/K, I, L, L'
Antena Input 75, Coaxial Cable
Audio Characteristics ·Audio Input : RCA Jack (L, R), 0.5 Vrms (-9 dB)
·Audio Input (PC) : 3.5ø Stereo Jack, 0.5 Vrms (-9 dB)
·Audio Output : RCA Jack (L, R), 0.5 Vrms (-9 dB)
·Speaker Output : Max. 10 W Output (3.5ø Stereo Jack, 2)
·Headphone Output : Max. 10 mW Output (3.5ø Stereo Jack, 32)
·Frequency : RFc 80 Hz~15 KHz (at -3 dB)
·Response : RFc 80 Hz~20 KHz (at -3 dB)
·SyncMaster LW29A13W/LW40A13W comply with SWEDAC (MPRII) recommendations for reduced electromagnetic fields.
·Designs and specifications are subject to change without prior notice.
LW29A13W/LW40A13W 2-1
2 Product Specifications
CONFIDENTIAL
2-2 Pin Assignments
Pin No. Signal Assignment Pin No. Signal Assignment Pin No. Signal Assignment
1 T.M.D.S. Data2- 9 T.M.D.S. Data1- 17 T.M.D.S. Data0-
2 T.M.D.S. Data2+ 10 T.M.D.S. Data1+ 18 T.M.D.S. Data0+
3 T.M.D.S. Data2/4 Shield 11 T.M.D.S. Data1/3 Shield 19 T.M.D.S. Data0/5 Shield
4 T.M.D.S. Data4- 12 T.M.D.S. Data3- 20 T.M.D.S. Data5-
5 T.M.D.S. Data4+ 13 T.M.D.S. Data3+ 21 T.M.D.S. Data5+
6 DDC Clock 14 +5V Power 22 T.M.D.S. Clock Shield
Ground
7 DDC Data 15 (return for +5V, HSync. and 23 T.M.D.S. Clock+
VSync.
8 Analog Vertical Sync. 16 Hot Plug Detect 24 T.M.D.S. Clock-
C1 Analog Red C2 Analog Green C3 Analog Blue
C4 Analog Horizontal Sync. C5 Analog Ground
(analog R, G & B return)
2-2 LW29A13W/LW40A13W
2 Product Specifications
CONFIDENTIAL
2-3 Timing Chart
This section of the service manual describes the timing that the computer industry recognizes as standard
for computer-generated video signals.
2-3-1 LCD Panel Mode : 1 mode
µs
µs
µs
µs
µs
µs
µs
µs
LW29A13W/LW40A13W 2-3
2 Product Specifications
CONFIDENTIAL
2-3-2 Supported Modes (1)
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
2-4 LW29A13W/LW40A13W
2 Product Specifications
CONFIDENTIAL
2-3-2 Supported Modes (2)
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
LW29A13W/LW40A13W 2-5
2 Product Specifications
CONFIDENTIAL
2-3-2 Supported Modes (1)
µs µs
µs µs
µs µs
µs µs
µs µs
µs µs
µs µs
µs µs
2-6 LW29A13W/LW40A13W
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.
LW29A13W/LW40A13W 3-1
3 Disassembly and Reassembly
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.
3-2 LW29A13W/LW40A13W
CONFIDENTIAL
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.
LW29A13W/LW40A13W 4-1
4 Alignments and Adjustments
CONFIDENTIAL
Memo
4-2 LW29A13W/LW40A13W
CONFIDENTIAL
5 Troubleshooting
5-1 No Power
Does proper DC 28 V appear at No
Check SMPS PCB and Adapter.
DC jack connected to CN112?
Yes
Does proper DC 5 V appear No
at Pin 1 of IC849 and Pin 2 of Check IC849, IC830 and IC828, IC852.
IC828, IC830, IC852?
Yes
Does proper DC 12 V appear at No
Check IC829.
Pin 2 of IC829?
Yes
Does proper DC 2.5 V appear at No
Check IC804, IC806 and IC807.
Pin 2 of IC804, IC806 and IC807?
Yes
Does proper DC 3.3 V appear at No
Check IC800, IC801 and IC805.
Pin 2 of IC800, IC801 and IC805?
Yes
Check IC811 and IC817.
LW29A13W/LW40A13W 5-1
5 Troubleshooting
CONFIDENTIAL
5-2 No Video (PC Analog Signal)
Power indicator is green
Does the signal appear at No Check the R, G, B signal line and
Pin 7, 15 and 22 of IC203? related the R, G, B signal line.
Yes
Does the clock pulse appear at No
Check IC203 and related circuit of IC203.
Pin 30 and 31 of IC203?
Yes
Does the colck pluse No
Check related circuit of IC838.
appear at Pin 4, 10 of IC838?
Yes
Replace LCD Panel.
5-2 LW29A13W/LW40A13W
5 Troubleshooting
CONFIDENTIAL
5-3 No Video (PC Digital Signal)
Power indicator is green
Does the signal appear at No Check R2018, 2019, 2020, 2021,
Pin 80, 81, 85, 86, 90, 91,
2022, 2023, 2024 and 2025.
93 and 94 of IC833?
Yes
Does the signal No
appear at RA603, RA631, Check IC833 and related circuit of IC833.
RA632 and RA633?
Yes
Replace LCD Panel.
5-4 No Picture (CVBS, S-VHS, Scart Video)
Check Pin 13, 15 (RF_CVBS1,
FR_CVBS2) of CN622? No
Check Tuner, Scart1, Scart2 connector.
Pin 9 (Scart1_Vin) of CN601
Pin 9 (Scart2_Vin) of CN621
Yes
Check Pin 3 (YIN), 5 (CIN) No
Check RCA, S-VHS connector.
and 7 (VCR) of CN601?
Yes
No Check related circuit of IC842
IC842 (VSP9437B)?
and replace IC842.
Yes
IC308, IC309 and replace it.
LW29A13W/LW40A13W 5-3
5 Troubleshooting
CONFIDENTIAL
5-5 No Sound (LW29A13W)
Does the Low signal at No
Check Pin 1 and 6 of CN113.
Pin 16 and of IC702?
Yes
Does the Low signal at No
Replace IC702.
Pin 17 of IC702
Yes
Check Pin 67 (QSS_IF),
Pin 53, 54 (Scart1_In), Pin 50, 51 No
Check CN703.
(Scart1_In), Pin 48, 47 (RCA),
of U458 (MSP3451)?
Yes
Replace IC831 (MSP 3451).
5-4 LW29A13W/LW40A13W
5 Troubleshooting
CONFIDENTIAL
5-6 No Sound (LW40A13W)
Does the Low signal at No
Check Pin 1 of CN624.
Pin 16 and of IC13?
Yes
Does the Low signal at No
Replace IC13.
Pin 17 of IC13
Yes
Check Pin 50, 52
(QSS_IF), Pin 44, 45 (RCA), No
Check CN629.
Pin 41, 42 (Scart1_In),
Pin 38, 39 (Scart1_In) of IC18?
Yes
Does the Digital signal at No
Check IC18 and related IC18?
Pin 8, 9 and 10 of IC15?
Yes
Check IC15 and realted IC15.
LW29A13W/LW40A13W 5-5
5 Troubleshooting
CONFIDENTIAL
5-7 LW40A13W (Digital Sound - coaxial optical)
Does the Low signal at No
Check Pin 1 of CN624.
Pin 16 of IC13?
Yes
Does the Low signal at No
Replace IC13.
Pin 17 of IC13?
Yes
Does the Digital signal at Pin 41 No
Check the CN627.
(coaxial), 43 (optical) IC15?
Yes
Does the Digital signal at No
Check IC15 and related IC15.
Pin 11, 12, 13 of IC15?
Yes
Check IC14.
5-6 LW29A13W/LW40A13W
CONFIDENTIAL
6 Exploded View and Parts List
6-1 LW29A13W
LW29A13W/LW40A13W 6-1
6 Exploded View & Parts List
CONFIDENTIAL
6-2 LW40A13W
6-2 LW29A13W/LW40A13W
CONFIDENTIAL
8 Block Diagram
8-1 LW29A13W
LW29A13W/LW40A13W 8-1
8 Block Diagrams
CONFIDENTIAL
8-2 LW40A13W
8-2 LW29A13W/LW40A13W
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
10
10
NC
NC
NC
NC
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
+28V
+28V
+28V
BL_EN
BRIGHT
1 GND
+14V_INV
+14V_INV
+14V_INV
+14V_INV
+14V_INV
+14V_INV
+14V_INV
+14V_INV
+14V_INV
+14V_INV
2 +5IN GND 1
LW29A13W/LW40A13W
3 CHUP GND 2
CN611
4 VOLUP 3
CN609
GND
9 Wiring Diagram
5 GND GND 4
6 CHDOWN GND 5
CN112
CN607
CN608
CN618
7 VOLDOWN +14V_INV 6
8 SOURCE +14V_INV 7
9 MENU +14V_INV 8
10 GND +14V_INV 9
+14V_INV 10
1 RX2+ 16 GND
2 GND 17 CHK_DSUB GND 1
3 RX2- 18 DDC_SCL_D
CN620
GND 2
4 GND 19 SSC_SDA_D GND 3
CN610
5 RX1+ 20 GND GND 4
6 GND 21 PC_V GND 5
7 RX1+ 22 GND +14V_INV 6
8 GND 23 PC_H +14V_INV 7
9 RX0+ 24 GND +14V_INV 8
10 GND 25 BLUE +14V_INV 9
11 RX0- 26 GND +14V_INV 10
12 GND 27 GREEN
13 RXC+ 28 GND
14 GND 29 RED
15 RXC- 30 GND NC 1
GND 2
NC 3
CN606
BRIGHT 4
1 IRINT 16 GND NC 5
2 GND 17 MC_SCLK BL_EN 6
NC 7
CN622
3 +5V_M 18 MC_DATA
GND 8
4 POWERON 19 GND
GND 9
5 LED_GREEN 20 AFT
6 LED_RED
7 +5V_TUNER
8 GND
9 MC_DATA 1
QSS_IF1
10 GND MC_SCLK 2
RESETn 3
CN619
11 QSS_IF2
12 GND RESETn 4
13 RF_CVBS1 NC 5
14 GND GND 6
15 RF_CVBS2
+5V_M 1
RXD 2
1 GND 16 SCART_VGIN
TXD 3
CN400
2 YIN 17 GND
RESETn 4
CN601
3 GND 18 SCART_VBIN
GND 5
4 CIN 19 GND
GND 6
5 GND 20 SCART_SWIN
6 VCR
7 GND
8 SCART_VIN
9 AC3_CTRL 16 GND 1
GND
10 SCART_VOUT GND 17 NSPPW 2
MC_DATA 18 GND 3
CN623
11 GND
12 SCART_BLIN MC_SCLK 19 +5V_IN 4
13 GND GND 20 GND 5
14 SCART_VRIN MAINPW 6
15 GND GND 7
A_SHUTDOWNB 8
GND 9
RESET_V 10
GND 11
1 GND 16 SCART_VGIN A_SY_BY 12
2 GND 17 GND GND 13
CN628
3 GND 18 SCART_VBIN AC3_MUTE 14
CN621
4 GND 19 GND GND 15
5 GND 20 SCART_SWIN
6 GND
7 GND
8 SCART_VIN +28V 1
TXOUT0-_B
TXOUT0+_B
TXOUT1-_B
TXOUT1+_B
GND
TXOUT2-_B
TXOUT2+_B
TXCLKOUT-_B
TXCLKOUT+_B
TXOUT3-_B
TXOUT3+_B
GND
TXOUT0-_A
TXOUT0+_A
GND
9 GND +28V 2
C1293
CN627
10 3
CN624
SCART_VOUT +28V
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
11 GND GND 4
12 SCART_BLIN GND 5
13 GND GND 6
14 SCART_VRIN
15 GND
GND
GND
GND
GND
GND
GND
+5V_PNL
+5V_PNL
+5V_PNL
+5V_PNL
+5V_PNL
+5V_PNL
GND
QSS_IF2
GND
QSS_IF1
TXOUT1-_A
TXOUT1+_A
TXOUT2-_A
TXOUT2+_A
TXCLKOUT-_A
TXCLKOUT+_A
TXOUT3-_A
TXOUT3+_A
LVDS_EN
BL_EN
RTA_DATA
RTA_SCLK
+5V_RTA
+5V_RTA
+5V_RTA
4
3
2
1
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
15
14
13
12
11