Samsung LT-P266W Schematic
TFT-LCD TV/MONITOR
Chassis Model
NF26UO LT-P266W
SERVICE
Manual
TFT-LCD TV/MONITOR CONTENTS
1. Precautions
2. Product Specifications
3. Disassembly & Reassembly
4. Alignment & Adjustments
5. Troubleshooting
6. Exploded View & Parts List
7. Parts List
8. Block Diagram
9. Wiring Diagram
10. PCB Layout
11. Schematic Diagrams
12. Panel Description
❈ This Service Manual is a property of Samsung
Electronics Co., Ltd.
Any unauthorized use of Manual can be punished
under applicable International and/or domestic law.
Samsung Electronics Co.,Ltd.
416, Maetan-3Dong, Yeongtong-Gu, Suwon City, Kyungki-Do, Korea, 443-742
Printed in Korea
P/N : BN82-00109N-00
URL : http://itself.sec.samsung.co.kr/
1 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
!
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
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.
LT-P266W 1-1
1 Precautions
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
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.
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.
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
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.
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.
1-2 LT-P266W
2 Product Specifications
2-1 Specifications
Item
LCD Panel TFT-LCD Panel, RGB vertical stripe, normaly Black, 26-Inch viewable, 0.537 mm pixel pitch
Scanning Frequency Horizontal : 30 kHz ~ 68 kHz (Automatic)
Vertical : 56 Hz ~ 85 Hz (Automatic)
Display Colors 16.7 Million colors
Maximum Resolution Horizontal : 1280 Pixels
Vertical : 768 Pixel
Input Video Signal Positive at 75 Ω
Input Sync Signal Type : Seperate H/V
Level : TTL level
Maximum Pixel Clock rate 80 MHz
Active Display
Horizontal/Vertical
AC power voltage & Frequency
Power Consumption 130 W
Dimensions (W x H x D)
Set 29.17 x 10.89 x 20.70 Inches (741.0 X 276.8 X 526.0 mm) State of stand installed
Package
Weight
Set / Package 15.0 kg (33.07 lbs) / 16.8 kg (37.04 lbs)
687.36 mm/ 412.42 mm
AC 100 - 240V ~, 50/60 Hz
29.17 x 4.68 x 16.92 Inches (741.0 X 119.0 X 498.5 mm) State of stand disassembled
34.49 x 13.35 x 28.11 Inches (876.0 X 339.0 X 714.0 mm)
Description
Environmental Considerations Operating Temperature : 50 °F ~ 104 °F (10 °C ~ 40 °C)
Operating Humidity : 10 % ~ 80 %
Storage Temperature : -4 °F ~ 113 °F (-20 °C ~ 45 °C)
Storage Humidity : 5 % ~ 95 %
Tunning Frequency Synthesize
TV System
Antena Input 75Ω
– MAX Internal speaker Out : Right => 5W
Sound Characteristic
– BASS Control Range : -8 dB ~ + 8dB
– TREBLE Control Range : -8 dB ~ +8 dB
– Headphone Out : 10 mW MAX
– Output Frequency : RF : 80 Hz ~ 15 kHz
LT-P266W 2-1
System NTSC-M
Sound STEREO
Left => 5W
A/V : 80 Hz ~ 20 kHz
2 Product Specifications
12 345 67 8
9 10111213141516
17 18 19 20 21 22 23 24
2-2 Pin Assignments
2-2-1 DVI-D (Digital)
Ref) DVI-D : Digital only
Pin No.
1
2
3
4
5
6
7
8
9
10
Signal Assignment
RX2-
RX2+
GND
NC
NC
DDC Clock (SCL)
DDC Data (SDA)
Analog Vertical Sync.
RX1-
RX1+
Pin No.
11
12
13
14
15
16
17
18
19
20
Signal Assignment
GND
NC
NC
DDC Input Power(+5V)
IDENT_PC
5V
RX0-
RX0+
GND
NC
Pin No.
21
22
23
24
Signal Assignment
NC
GND
RXC+
RXC-
2-2 LT-P266W
2 Product Specifications
2-2-2 Component 1, 2
RCA Green
RCA Blue
RCA Red
RCA White
RCA Red
Y
GND
Pb (Cb)
GND
Pr (Cr)
GND
Audio L
GND
Audio R
GND
2-2-3 S-Video
Pin
1
2
3
4
5
Separate
GND
Y
C
GND
GND
2-2-4 A/V
RCA Yellow
RCA White
RCA Red
CVBS
Audio L
GND
Audio R
GND
LT-P266W 2-3
2 Product Specifications
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 Mode1 mode
2-4 LT-P266W
2-3-1 Supported Modes (1)
2 Product Specifications
LT-P266W 2-5
2 Product Specifications
2-3-1 Supported Modes (2)
2-6 LT-P266W
2-3-1 Supported Modes (3)
2 Product Specifications
LT-P266W 2-7
2 Product Specifications
Memo
2-8 LT-P266W
3 Disassembly and Reassembly
This section of the service manual describes the disassembly and reassembly procedures for the
LT-P266W 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.
1. Place LCD TV face down on cushioned table.
Remove 4 screws from grip on the stand and
remove the stand.
2. Remove 10 screws from the rear cover and lift
up the rear cover.
3. Disconnect speaker cable, function cable from
the shield and remove 19 screws from the
shield.
4. Remove 18 screws from the boards and
disconnect LVDS cable, inverter cable from the
boards.
5. Remove 18 screws from the cabinet BRKT and
lift up the panel.
LT-P266W 3-1
3 Disassembly and Reassembly
3-2 Reassembly
6. Remove 4 screws from the panel BRKT.
(Top/Bottom)
Disconnect BRKT from the panel.
7. Remove 4 screws from the panel BRKT.
(Lelt/Right)
Disconnect BRKT from the panel.
Reassembly procedures are in the reverse order of dissasembly procedures.
3-2 LT-P266W
4 Alignments and Adjustments
4-1 General Alignment Instuction
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 an AC 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.
LT-P266W 4-1
4 Alignments and Adjustments
4-2 Factory Mode Adjustments
4-2-1 Entering Factory Mode
1. To enter “Service Mode” Press the remote -control keys in this sequence :
- If you do not have Factory remote - control
- If you have Factory remote - control
- The buttons are active in the service mode.
1. Remote - Control Key : Power, Arrow Up, Arrow Down, Arrow Left
Arrow Right, Menu, Enter, Number Key(0~9)
2. Function - Control Key : Power, CH +, CH -, VOL +, VOL -,
Menu, TV/VIDEO(Enter)
4-2-2 Factory Mode Tree
4-2 LT-P266W
4 Alignments and Adjustments
LT-P266W 4-3
4 Alignments and Adjustments
4-4 LT-P266W
4 Alignments and Adjustments
LT-P266W 4-5
4 Alignments and Adjustments
4-6 LT-P266W
4 Alignments and Adjustments
LT-P266W 4-7
4 Alignments and Adjustments
4-8 LT-P266W
4 Alignments and Adjustments
* Unless otherwise specifid, do not adjust data in Factory Mode.
* Data may be changed for display improvement.
LT-P266W 4-9
4 Alignments and Adjustments
4-3 White Balance Adjustment
1. In factory mode (1, 3, 6), you can adjust the white balance.
2. As the adjustment and data values differ depending on input sources, different adjustments are
requried for RF, DTV (Component 1, 2) and PC/DVI modes.
3. Optimum condition data for each mode are saved as default values. (Refer to Table 2, 3)
4. As the RF mode is applied with the same vlaues as for VIDEO and S-VIDEO, adjustment can be
made in any of RF, VIDEO and S-VIDEO modes.
Table 4-1. White Balance Setting Conditions
Table 4-2. Color Control Default Vlaue
Table 4-3. Color Control Default Vlaue
4-10 LT-P266W
4-3-1 Conditions for Measurement
1. On the basis of toshiba ABL pattern : High Light level (57 IRE)
- INPUT SIGNAL GENERATOR : MSPG-925LTH
* Mode NO 1 : 750X480@60 Hz
NO 6 : 1280X720@60 Hz
NO 21 : 1024X768@60 Hz
* Pattern NO 36 : 16 Color Pattern
NO 16 : Toshiba ABL Pattern
2. Optical measuring device : CA210 (FL)
Please use the MSPG-925 LTH generator for model LT-P266W.
4-3-2 Method of Adjustment
1. Adjust the basic level of DTV and PC input signals.
a) Set the input to the mode in which the adjustment will be made (DTV PC).
* Input signal - DTV Mode : Model #6 (1280*720 Mode), Pattern #36
- PC Mode : Model #21 (1024*768 Mode), Pattern #16 (Picture 4-1)
b) Enter factory Calibration, confirm the ADC data (DTV, PC Mode Only).
* ADC default value : Table 4-3.
4 Alignments and Adjustments
Picture 4-1 Toshiba ABL Pattern
2. Adjust the white balance of RF, DTV and PC Modes.
a) Set the input to the mode in which the adjustment will be made (RF DTV PC).
* Input signal - VIDEO Mode : Model #1 (750*480 Mode), Pattern #16
- DTV Mode : Model #6 (1280*720 Mode), Pattern #16
- PC Mode : Model #21 (1024*768 Mode), Pattern #16
b) Enter factory color control, confirm the data.
LT-P266W 4-11
4 Alignments and Adjustments
c) Adjust the low light. (Refer to table 1, 2 in adjustment position by mode)
- Adjust sub - Brightness to set the 'Y' value.
- Adjust red offset ('x') and blue offset ('y') to the color coordinates.
* Do not adjust green offset data.
Picture 4-2 Toshiba ABL Pattern
Low light
Measurement point
d) Adjust the high light. (Refer to table 1, 2 in adjustment position by mode)
- Adjust red gain ('x') and blue gain ('y') to the color coordinates.
* Do not adjust the green gain and sub-contrast (Y) data.
Picture 4-3 Toshiba ABL Pattern
High light
Measurement point
4-12 LT-P266W
4-3-3 Option Table
4 Alignments and Adjustments
* The default settings are most recommended for Option Data. Each data may be adjusted.
4-3-4 PW565
* Below figures are for contrast adjustment of PW565 (IC565). Do not change the data.
LT-P266W 4-13
4 Alignments and Adjustments
4-3-5 VPC 3230-MAIN
* Data may be adjusted.
4-3-6 ADC
*Adjust the R(Pr), G(Y), B(Pb) gain and offset to the basic level of DTV and PC Input signals.
4-14 LT-P266W
4-3-7 DNIe
* Control the specify item that a output signals of scalar (PW565).
* This data can be changed without notice.
4 Alignments and Adjustments
4-3-8 MDIN-150
* Control the specify item that a output signals (RF, CVBS, S-VHS Modes) of MDIN-150 (IC405).
* This data can be changed without notice.
4-3-9 3D Comb
* Control the specify item that a input signals (RF, CVBS, S-VHS Modes) of D64083 (IC303).
* This data can be changed without notice.
4-3-10 Test Pattern
* Use below test patters to demonstrate the image display of PW565 (IC602).
1) Luma Ramp (16 step)
2) Luma Ramp (128 Step)
3) White 16
4) White 240
5) Color Bar
6) RGB Ramp (32 Step)
4-3-11 Check sum
* XXXX : Displays the current check sum size of the MICOM.
(Varies depending on program update)
4-3-12 Reset
* Initializes the data in the MICOM. (Set to default value)
Use ‘Reset’ to restore adjustmints made in Factory Mode to the original settings.
4-3-13 T_NPL26NUS_0400 03/30/2004 9:19:40
* Displays the MICOM program version
LT-P266W 4-15
4 Alignments and Adjustments
4-4 How to use SW(FlashupgradNT) for LT-P266W Set program update
1. Store program practice file in new folder.
2. Connect Set and Jig Cable to execute Program Update.
(Refer to the Picture 4-4 attachment)
3. After completing the JIG Cable connection, store Update practice program (hex file 3EA) in new folder.
(guiR, romcode, factoryGui).
4. Click FlashupgradNT.exe icon 2 times and execute it.
(Upgrader OSD screen is marked)
Picture 4-4
5. Select OFull.inf in Flash.
(flaher, romcode, guir, factorygui items look in Files To)
Picture 4-5
4-16 LT-P266W
Loading...