Samsung T240HD, T260HD Schematic

LCD-Monitor

Chassis : LTD24NS

LTD26NS

Model :

SERVICE

TFT-LCD Monitor Contents

T240HD T260HD

Manual

T240HD / T260HD

1. Precautions

2. Product specications

3. Disassembly and Reassembl

4. Troubleshootin

5. Exploded View & Part Lis

6. Wiring Diagra

7. Schematic Diagra

Refer to the service manual in the GSPN (see the rear cover) for the more information.

Contents

1. Precautions .............................................................................................................. 1-1

1-1. Safety Precautions ......................................................................................................... 1-1

1-2. Servicing Precautions ..................................................................................................... 1-2

1-3. Static Electricity Precautions .......................................................................................... 1-2

1-4. Installation Precautions .................................................................................................. 1-3

2. Product specications ............................................................................................ 2-1

2-1. Feature & Specications ................................................................................................. 2-1

2-2. Spec Comparison to the Old Models .............................................................................. 2-3

2-3. Accessories .................................................................................................................... 2-4

3. Disassembly and Assembly ................................................................................... 3-1

3-1. Disassembly ................................................................................................................... 3-1

4. Troubleshooting ...................................................................................................... 4-1

4-1. First Checklist for Troubleshooting ................................................................................ 4-1

4-2. No Power ........................................................................................................................ 4-2

4-3. PC (ANALOG) No Screen ............................................................................................ 4-5

4-4. DVI No Screen ............................................................................................................... 4-8

4-5. HDMI1 No Screen ........................................................................................................ 4-11

4-6. HDMI2 No Screen ........................................................................................................ 4-13

4-7. Faults and Corrective Actions ....................................................................................... 4-14

4-8. Adjustment .................................................................................................................... 4-15

4-10. Service Adjustment ..................................................................................................... 4-16

5. Exploded View & Part List ...................................................................................... 5-1

5-1. Exploded View (24”) ....................................................................................................... 5-1

5-2. Parts List ..................................................................................................................................................... 5-3

5-3. Exploded View (26”) ..................................................................................................... 5-24

5-4. Parts List ................................................................................................................................................... 5-26

6. Wiring Diagram ........................................................................................................ 6-1

6-1. Wiring Diagram - Main Board ......................................................................................... 6-1

6-2. Wiring Diagram - Main Board ......................................................................................... 6-2

6-3. Wiring Diagram - IP Board .............................................................................................. 6-3

7. Schematic Diagram ................................................................................................. 7-1

7-1. Circuit Descriptions ......................................................................................................... 7-1

7-2. Block Diagram (IP Board) ............................................................................................... 7-2

7-3. Power Tree (Main Board) ............................................................................................... 7-3

7-4. Schematic Diagrams ...................................................................................................... 7-5

7-4-1. Schematic Diagrams (POWER) .................................................................................. 7-5

7-4-2. Schematic Diagrams (Function / DDR Memory / Scaler) ............................................ 7-6

7-4-3. Schematic Diagrams (LVDS / OP AMP / Scaler) .........................................................7-7

7-4-4. Schematic Diagrams (Tuner / Channel Chip ) .............................................................7-8

7-4-5. Schematic Diagrams (Connector) ............................................................................... 7-9

7-4-6. Schematic Diagrams (TMDS Switch) ........................................................................ 7-10

7-4-7. Schematic Diagrams (Sound Amp / Headphone) ...................................................... 7-11

1. Precautions

1-1. Safety Precautions

Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as electrical shock.

1-1-1. Warnings

For continued safety, do not attempt to modify the circuit board.

Disconnect the AC power and DC power jack before servicing.

1-1-2. Servicing the LCD Monitor

When servicing the LCD Monitor, Disconnect the AC line cord from the AC outlet.

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:

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.

Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and compartment covers or shields, isolation resistorcapacitor networks, mechanical insulators, etc.

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).

(READING SHOULD) NOT BE ABOVE 0.5mA

DEVICE UNDER TEST

TEST ALL

EXPOSED METAL

SURFACES

2-WIRE CORD

*ALSO TEST WITH

PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)

With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unit’s AC switch

LEAKAGE CURRENT TESTER

EARTH

GROUND

Figure 1-1. Leakage Current Test Circuit

rst 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 safetyrelated 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 identied 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, re and/or other hazards. Product safety is under review continuously and new instructions are issued whenever

appropriate.

1-1

1-2

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:

1-2-1 General Servicing Precautions

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.

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.

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.

Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels, input terminals and earphone jacks).

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 theblades 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.

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.

If unforeseen circumstances create conict between the following servicing precautions and any of the

safety precautions, always follow the safety precautions.

1-3. Static Electricity 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 eld-effect

transistors. The following techniques will reduce the incidence of component damage caused by static electricity.

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 wrist-strap device. To avoid a shock hazard, be sure to remove the wrist strap before applying power to the monitor.

After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent accumulation of an electrostatic charge.

Do not use freon-propelled chemicals. These can generate electrical charges sufcient to damage ESDs.

Use only a grounded-tip soldering iron to solder or desolder ESDs.

Use only an anti-static solder removal device. Some solder removal devices not classied as “anti-static” can generate electrical charges sufcient to damage ESDs.

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.

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.

Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together,

or lifting your foot from a carpeted oor can generate enough static electricity to damage an ESD.

1. Precautions

1-4. Installation Precautions

For safety reasons, more than two people are required for carrying the product.

Keep the power cord away from any heat emitting devices, as a melted covering may cause re or electric shock.

Do not place the product in areas with poor ventilation such as a bookshelf or closet. The increased internal

temperature may cause re.

Bend the external antenna cable when connecting it to the product. This is a measure to protect it from being exposed

to moisture. Otherwise, it may cause a re or electric shock.

Make sure to turn the power off and unplug the power cord from the outlet before repositioning the product. Also check

the antenna cable or the external connectors if they are fully unplugged. Damage to the cord may cause re or electric

shock.

Keep the antenna far away from any high-voltage cables and install it rmly. Contact with the highvoltage cable or the

antenna falling over may cause re or electric shock.

When installing the product, leave enough space (10cm) between the product and the wall for ventilation purposes.

A rise in temperature within the product may cause re.

1-3

2. Product specications

2-1. Feature & Specications

Feature

Supreme Digital Interface & Networking

�

- With a built-in HD digital tuner, it supports HD broadcasting with no particular set-top box and provides simple access with a single remote control.

Excellent Picture Quality

�

Dynamic Contrast

�

- Automatically detects the input visual signal and adjusts to create optimum contrast.

DTV Tuner, HDMI, Stereo, Dolby Digital support

�

Convenience

�

-The TV utilizes the HDMI system to implement perfect digital sound and picture quality.

Specications

Item Description

Model T240HD T260HD

LCD Panel TFT-LCD Panel, RGB Vertical stripe,

normally White, 24-Inch viewable,

0.270(H)x0.270(V) mm Pixel Pitch

Scanning Frequency Horizontal : 30 kHz ~ 81 kHz (Automatic)

Vertical: 56 Hz ~ 75 Hz(Automatic)

Display Colors 16.7 Million colors

Maximum resolution

Input Signal Analog 0.7 Vp-p ±5% positive at 75Ω, internally terminated

Input Sync Signal Type : Seperate H/V

Maximum Pixel Clock rate 162 MHz

Active Display (Horizontal/Vertical)

AC power voltage & Frequency

Power Consumption

Dimensions Set (W x D x H)

Horizontal: 1920pixels

Vertical: 1200pixels

Level : TTL level

518.4 (H) x 324.0 (V) 550.08 (H) x 343.8 (V)

AC 110 ~ 240V, 50 ~ 60 Hz

54W ＜ 2W

573 x 409 x 87 mm (Without Stand)

573 x 477 x 245 mm (With Stand)

TFT-LCD Panel, RGB Vertical stripe, normally White, 26-Inch viewable,

0.2865(H)X0.2865(V) mm Pixel Pitch

610 x 435 x 86.5 mm (Without Stand)

610 x 502.5 x 245 mm (With Stand)

Weight Set

(After installation Stand)

TV System Tuning Frequency Synthesize

7.3 Kg 8.6 Kg

System NTSC

Sound MONO, STEREO

2-1

2-2

2. Product specications

Specications

Item Description

Model T240HD T260HD

Environmental Considerations Operating Temperature: 50˚C ~ 104˚F(10˚C ~ 40˚C)

Operating Humidity : 10% ~ 80%

Storage Temperature: -4˚C ~ 113˚C(-20˚C ~ 45˚C)

Storage Humidity: 5% ~ 95%

Antenna Input 75Ω

Sound Characteristic -MAX Internal speaker Out : Right : 3W / Left : 3W

-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 A/V : 80 Hz ~ 20 kHz

2. Product specications

2-2. Spec Comparison to the Old Models

Model T240HD / T260HD Curie (225MD)

Design

Screen Size 24” / 26” 22”

Resolution 1920 x 1200 (WUXGA) 60Hz 1680x1050 (WSXGA) 60Hz

Brightness 300cd/m2 400cd/m2

Contrast Ratio 1000:1 700:1

Response Time 5ms 5ms

24” : Left/Right/Up/Down : 80˚/80˚/80˚/80˚

Viewing Angle

26” : Left/Right/Up/Down : 85˚/85˚/80˚/70˚

PC Input D-SUB, DVI D-SUB, DVI

Power Consumption 54W 58W

DPMS Less than 2W Less than 1W

Sound Output 3W x 2 3W x 2

Image Size : If the resolution is not wide resolution, this option allows the screen size to be selected as normal or wide.

Left/Right/Up/Down : 85˚/85˚/80˚/80˚

2-3

2. Product specications

2-3. Accessories

Product Description Ccde. No Remark

Remote Control

Batteries (AAA x 2)

Power Cord 3903-000085

Stand Body BN96-07605D

BN59-00678A

Stand Base BN96-07604A

D-Sub Cable BN39-00244G

CBF SIGNAL-DVI(D) BN39-00246K

User’s Guide,

Monitor Driver,

Natural Color Pro Software

Cleaning Cloth BN63-01798A

BN96-07540A

Samsung Electronics

Service center

2-4

3. Disassembly and Assembly

This section describes the disassembly and reassembly sequences for this monitor.

Warning: As this monitor has parts that are sensitive to static electricity, be careful when handling them.

3-1. Disassembly

Caution: 1. Turn the monitor off before beginning the disassembly process.

2. When disassembling the monitor, do not use any metal tools except for the provided jig.

3. Remove the signal cable and the power cord before beginning the disassembly.

Description Photo Screws

1. Place monitor face down on cushioned table. Remove Stand, then remove 4 marked screws from the rear cover.

Caution : If you do not tilt the stand and use too

much force to remove it, the connection pin may break.

2. Remove the cover and the LCD panel using the provided jig on both grooves at the bottom.

3-1

3-2

3. Disassembly and Assembly

Description Photo Screws

3. Insertaatscrewdriverintothegrooveandthen

lift up and remove the cover.

4. After remove COVER-REAR, then disconnect SPEAKER , FUNCTION wire.

5. Disconnect LVDS cable from panel.

Description Photo Screws

6. After disconnecting SHIELD-LAMP of left side, disassemble lamp wire between panel and IP Board.

Caution : When removing the SHIELD-LAMP, do

not remove the GASKET-SHEET from the SHIELD-LAMP. If the GASKET-SHEET is damaged, you will not be able to receive free service.

3. Disassembly and Assembly

Shield Lamp

GASKET-SHEET

7. Remove 8 marked SCREW of left picture. Disconnect IP board.

※ Reassembly procedures are in the reverse order

of disassembly procedures.

3-3

3-4

3. Disassembly and Assembly

Description Photo Screws

8. Remove the four (4) screws.

9. Remove the LCD panel.

10. Remove the IR module by tilting the left snap to the right.

11. Remove the LED module by sliding the snap

designatedintherightgurebackwards.

Description Photo Screws

12. Remove the two (2) screws and then remove the holders from the four (4) snaps designated in the

rightgureusingtheprovidedjig.

13. Remove the two (2) connectors.

Caution : Servicing is not supported for the PCB.

3. Disassembly and Assembly

▶Assembly

14. The assembly is in the reverse order of the disassembly.

15. Connect the disassembled snap and the LED module again.

3-5

3. Disassembly and Assembly

Description Photo Screws

16.Fixtheconnectingwirewithlamenttape

Caution : If the wire is damaged when closing the

cover, an operating error may occur. Therefore, make sure to close the

coverafterxingitwithlamenttape.

lamenttape

※ The assembly is in the reverse order of disassembly.

3-6

4. Troubleshooting

4-1. First Checklist for Troubleshooting

Self-Test Feature Check



Your monitor provides a self test feature that allows you to check whether your monitor is functioning properly.

Turn off both your computer and the monitor.

Unplug the video cable from the back of the computer

Turn on the monitor.

3. If the monitor is functioning properly, you will see a box in the illustration below. .

This box appears during normal operation if the video cable becomes disconnected or damaged.

4. Turn off your monitor and reconnect the video cable; then turn on both your computer and the monitor.

If your monitor screen remains blank after using the previous procedure, check your video controller and computer system; your monitor is functioning properly.

Warning Messages



If there is something wrong with the input signal, a message appears on the screen or the screen goes blank although the power indicator LED is still on. The message may indicate that the monitor is out of scan range or that you need to check the signal cable.

Environment



The location and the position of the monitor may inuence the quality and other features of the monitor.

If there are any sub woofer speakers near the monitor, unplug and relocate the woofer to another room.

Remove all electronic devices such as radios, fans, clocks and telephones that are within 3 feet (one meter) of the monitor.

Useful Tips



▶ A monitor recreates visual signals received from the computer.

Therefore, if there is trouble with the computer or the video card, this can cause the monitor to become blank,

have poor coloring, noise, Video mode not supported, etc. In this case, rst check the source of the problem,

and then contact the Service Center or your dealer.

▶ Judging the monitor’s working condition

If there is no image on the screen or a “Not Optimum Mode”, “Recommended Mode 1920 x 1200 60Hz” message

comes up, disconnect the cable from the computer while the monitor is still powered on.

- If there is a message coming up on the screen or if the screen goes white, this means the monitor is in working

condition.

- In this case, check the computer for trouble.

4-1

4. Troubleshooting

4-2. No Power

Diagnostics

CN100

C129

C108

IC103

C135

Does proper 13V appear at pin

No. 2 of CN100? ①

Does proper 5V appear at pin No.

6 and 7 of CN100? ②

Yes

Does proper 13V appear at

C129? ①

Does proper 5V appear at

C108? ②

Yes

IC110

IC203

Main Board Front

Q100

Check IP Board

Check related circuit of CN100

Does proper 5V appear at pin No.1

of Q100? ②

Yes

Does proper 1.2V appear at

C135? ③

Yes

Change main board for

MICOM(IC203) problem

Caution Make sure to disconnect the power before working on the IP board.

Check related circuit of Q100

Check related circuit of IC103

4-2

4-2-1. Circuit diagrams when the power does not turn on

4. Troubleshooting

4-3

4. Troubleshooting

①

②

③

4-4

4-3. PC (ANALOG) No Screen

C509, C510

4. Troubleshooting

CN300

CN500

Main Board Front

Diagnostics

Caution Make sure to disconnect the power before working on the IP board.

Does led persists green light after

power on?

Yes

Does proper 5V appear at pin No.

9 of CN500?

Yes

Does proper V and H-sync appear

at C510 and C509? ④, ⑤

Yes

Does proper clock signals appear

at pin NO.11,12,23,24 of CN300?

Yes

Check connection between main

board and panel.

Change Panel.

Check IP board

Check D-sub cable connection

Check PC state

Change main board

because of scaler problem

4-5

4. Troubleshooting

4-3-1. Circuit diagrams and waveforms (Analog) when no screen is displayed

on the monitor

4-6

4-3-2. Waveforms when no screen is displayed (Analog PC)

④

⑤

4. Troubleshooting

4-7

4. Troubleshooting

4-4. DVI No Screen

CN300

Diagnostics

CN500

IC600

CN501

Does led persists green light after

power on?

Yes

Dose proper 5V appear at pin No.

14 of CN501?

Yes

Does proper signals appear at

pin No.6(SCL) ⑥ and No.7(SDA)

⑦ of CN501?

Yes

Does proper clock signals

appear at pin NO.38 and NO.39

of IC600?

Yes

Main Board Front

Check IP board

Check DVI cable connection

Check PC state

Change IC600

Does proper clock signals

appear at pin NO.11,12,23,24

of CN300?

Yes

Check connection between

main board and panel.

Change Panel.

Caution Make sure to disconnect the power before working on the IP board.

4-8

Change main board

because of scaler problem

+ 53 hidden pages

Samsung T240HD, T260HD Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual