Samsung 400DXn, 460DXn Schematic

LCD-Monitor

Chassis : LS40BPT

LS46BPT

Model : 400DXn

SERVICE

TFT-LCD Monitor Contens

460DXn

Manual

400DXn / 460DXn

1. Precautions

2. Product specications

Disassembly and Reassemble

Troubleshooting

Exploded View & Part List

Wiring Diagram

Schematic Diagram

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

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 ..............................................................................2-2

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

2-4. Accessories (Sold separately) ........................................................................................2-4

3. Disassembly and Reassemble ............................................................................... 3-1

3-1. Disassembly (400DXn) ...................................................................................................3-1

3-2. Disassembly (460DXn) ...................................................................................................3-3

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

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

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

4-3. No PC(D-SUB) Video .....................................................................................................4-4

4-4. No DVI Video ..................................................................................................................4-6

4-5. No BNC Video ................................................................................................................4-8

4-6. No Component Video ...................................................................................................4-10

4-7. No AV Video ..................................................................................................................4-12

4-9. Faults and Corrective Actions .......................................................................................4-14

4-6. Adjustment ....................................................................................................................4-15

.................................2-3

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

5-1. Exploded View ................................................................................................................5-1

5-2. 400DXN Parts List ..........................................................................................................5-3

5-3. 460DXN Parts List ........................................................................................................5-49

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

6-1. Wiring Diagram (Main) ....................................................................................................6-1

6-2. Wiring Diagram (Network) ....................................................................................

6-3. Wiring Diagram (Photo - Main Board) ............................................................................6-3

6-4. Wiring Diagram (Photo - SMPS Board - 400DXn) ..........................................................6-4

6-5. Wiring Diagram (Photo - SMPS Board - 460DXn) ..........................................................6-5

6-6. Wiring Diagram (Photo - Network Power Board) ............................................................6-6

6-7. Wiring Diagram ...............................................................................................................6-7

6-8. Connector Functions ...................................................................................

6-9. Cables ............................................................................................................................6-9

..........6-2

...................6-8

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

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

7-2. Schematic Diagram .....................................................................................................7-17

GSPN (Global Service Partner Network)

Area Web Site

North America http://service.samsungportal.com

America http://latin.samsungportal.com

Latin CIS http://cis.samsungportal.com Europe http://europe.samsungportal.com China http://china.samsungportal.com Asia http://asia.samsungportal.com Mideast

This

Any unauthorized use of Manual can be punished under applicable International and/or domestic law.

& Africa http://mea.samsungportal.com

Service Manual is a property of Samsung Electronics Co.,Ltd.

Printed in Korea P/N: BN82-00135P-00

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.

1. 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.

1. It is essential that service technicians have an accurate voltage meter available at all times. Check the calibration of

2. 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

1. chassis and other metal parts in the monitor.

Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and

2. compartment covers or shields, isolation resistorcapacitor networks, mechanical insulators, etc.

Leakage Current Hot Check (Figure 1-1):

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

safety precautions, always follow the safety precautions.

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

1. 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

2. 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

3. 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,

4. input terminals and earphone jacks).

Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON.

5. 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;

6. always remove the instrument’s ground lead last.

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

1. 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

2. accumulation of an electrostatic charge.

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

3. 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

6. 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

7. 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.

2. 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

1. Precautions

Memo

1-4

2. Product specications

2-1. Feature & Specications

Model LS40BPT / LS46BPT

Feature

VMB (Vertical Marketing Business) Model

�

MFM (Multi Function Monitor):

�

Receives diverse support other than PC (DVI, HDMI, AV, S-video, Component)

Response Time 8ms SPVA adopted

�

Sound function reinforced by adopting SRS Trusurround

�

RS232 Remote Control (MDC software provided)

�

Video input: PC(D_SUB,DVI), BNC, DVI, HDMI, Component, AV, S-Video

�

Audio input: PC(D_SUB,DVI) Stereo, Video(AV, S-Video), Component, BNC, HDMI

�

Image & sound output: PC, BNC, AV, S-Video, Component out, speaker out

�

10W x 2 speaker

�

PIP automatic switch timer function: PIP automatically pops-up when setting time

�

PIP, OSD menu transparency control

�

Sleep timer (automatic switch-off) function

�

Wall & Ceiling Mounting (Optional VESA Wall Mount Kit)

�

2. Product specications

Specications

Item Description

Model LS40BPT LS46BPT

LCD Panel AMLCD 40” ( LTI400WT-L02 ) AMLCD 46” ( LTI460WT-L02 )

Optimum Resolution 1360x768@60Hz / 1366x768@60Hz depends on graphics card used

Display Size 40” (16:9) 46” (16:9)

Brightness 700cd/m²

Contrast Ratio 1200:1

Response Time 8 ms (by DDC2)

Viewing Angle 89/89/89/89 (Left/Right/Up/Down)

PC Input

Video System AV, S-Video, Component, HDMI

Supported Resolution

(Component)

Power Consumption Less than 280W Less than 330W

DPMS

D-SUB, DVI, BNC

1080I(50/60), 480I, 480P, 576I, 576P, 720P(50/60), 1080P(50/60)

1 W

Sound Output 10W x 2

Designs and specications are subject to change without prior notice.�

2-1

2-2

2. Product specications

2-2. Spec Comparison to the Old Models

Model BEETHOVENPLUS (400DXn/460DXn) LG (M4200N)

Design

Size 40”/46” (1366 x 768) → SPVA 42” (1366 x 768) → S-IPS

Panel

Input

Feature

Spec

PC D-Sub, DVI-D, BNC D-Sub, DVI-D

Video S-Video, CVBS, Component, HDMI -

TV - -

Speaker 10Watt x 2Ch -

Finction

VESA Wall Mount, Remote Control

700cd/m², 1200:1

178/178, 8ms

PIP/PBP, DNIe, MDC Program,

Integrated PC Function, Function Key Lock,

VESA Wall Mount, Remote Control

500cd/m², 1000:1

178/178, 10ms

2-3. Accessories

Product Description Ccde. No Remark

2. Product specications

Quick Setup Guide BH68-70448A

Warranty Card

(Not available in all locations)

Natural Color, MDC,

MagicNet Software

User’s Manual

D-Sub(15 Pin) Cable BN39-00244B

Power Cord 3903-000042

BNC to RCA

Adaptor Jack

Semi Stand BN96-04678A

BH68-00633A

BN59-00528F

3705-001262

Samsung Electronics

Service center

Screw (4EA)

TAPTITLE: M4 × L15

Remote Control BN59-00489A

Batteries (AAA × 2) 4301-000121

6003-001026

2-3

2. Product specications

2-4. Accessories (Sold separately)

Product Description Ccde. No Remark

DVI Cable BN39-00246F

Wall Mount KIT

Speaker Set

Samsung Electronics

Service center

BNC Cable

Speaker Wire Cable

LAN Cable

2-4

3. Disassembly and Reassemble

This section of the service manual describes the disassembly and reassembly procedures for the 400DXn/460DXn LCD monitor.

WARNING: This monitor contains electrostatically sensitive devices. Use caution when handling these components.

3-1. Disassembly (400DXn)

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.

Description Picture Description Screws

1. Remove 16 screws from the rear cover and lift up the rear cover.

2. Remove 12 screws from the shield and lift up the shield cover.

3. Remove 24 screws and FAN as showed the picture.

4. Remove the cables and separate the SMPS board and main board from bottom BRKT as showed the picture.

FAN 1

FAN 2

3-1

3-2

3. Disassembly and Reassemble

Description Picture Description Screws

5. Remove 4 screws, and lift up BRKT and stand BRKT.

6. Remove the screws between side BRKT and front cabinet, disconnect the cable of function PCB as showed left picture, and Remove the front cover and separate the panel.

7. Remove the screws from side BRKT (top/ bottom-3, left/right-2) and separate the side BRKT.

Reassembly procedures are in the reverse order of disassembly procedures.※

3-2. Disassembly (460DXn)

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.

Description Picture Description Screws

1. Remove 16 screws from the rear cover and lift up the rear cover.

3. Disassembly and Reassemble

2. Remove 12 screws and FAN from the shield and lift up the shield cover.

3. Remove 20 screws as showed the picture.

4. Remove the cables and separate the SMPS board and main board from bottom BRKT as showed the picture.

FAN 1

FAN 2

FAN 3

FAN 2

5. Remove 4 screws, and lift up BRKT and stand BRKT.

3-3

3. Disassembly and Reassemble

Description Picture Description Screws

6. Remove the screws between side BRKT and front cabinet, disconnect the cable of function PCB as showed left picture, and Remove the front cover and separate the panel.

7. Remove the screws from side BRKT (top/ bottom-3, left/right-2) and separate the side BRKT.

Reassembly procedures are in the reverse order of disassembly procedures.※

3-4

4. Troubleshooting

4-1. Troubleshooting

Before troubleshooting, setup the PC ‘s display as below.

• Resolution: 1680 x 1050

• H-frequency: 64 kHz

• V-frequency: 60 Hz If no picture appears, make sure the power cord is correctly connected.

2. Check the following circuits.

• No raster appears: Function PBA, Main PBA, I/P PBA

• 55V develop but no screen: Main PBA

• 5V does not develop: I/P PBA If you select Brightness adjust menu and push the “ (Enter/Source)” button for 5 seconds, the monitor automatically

4. returns to factory reset.

4-1

4. Troubleshooting

4-2. No Power

Symptom

Major

checkpoints

When turning on the Power button after connecting the power, the LED at the front of the monitor does not operate.

Check the IP board power fuse and the IP board output power. Check the connections for the IP board and the Main board inside the monitor. Check the LED of Power & IR function board and connections between the function assy and

main board. Check the Main board power part and check also whether there is any abnormal output at other

output terminals.

C644

Diagnostics

CN601

C627

IC 607

Main Board Front Main Board Back

Does the LED operate properly and

power assy and main board are

connected well?

Yes

Does 13V appear at Pin #5,6,7 of

CN601?

Yes

IC610

Change the power function

assy or Reconnect the cable.

Check the IP Board and

connection.

Does 13V appear at C627, C644?

Yes

Dose 3.3V appear at Pin #1 of IC607?

Yes

Dose 1.8V appear at Pin #1 of IC610?

Yes

MICOM(IC300) operates abnormally.

Replace the Main Board.

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

4-2

Check the peripheral circuit of

CN601.

Replace IC607

Replace IC610

4-3. No PC (ANALOG) Video

Symptom Though the LED power turns on, the screen is blank when connecting the VGA cable.-

Check the D-sub cable connections.

Check whether the LVDS cable is connected correctly to the panel.

Major

checkpoints

Check whether the lamp connector of the panel is connected correctly to the IP board.

Check the circuit related PC input and scaler operation.

4. Troubleshooting

CN303

X301

CN101, C109, C110

Diagnostics

Main Board Front

Dose the LED light up when the

power turnen on?

Yes

Dose 5V appear at Pin #5 of CN101?

Yes

Dose the waveform at C109(V-sync)

and C110(H-Sync) appear?

Yes

X301 oscillate properly?

Yes

Does the clock be entered at Pin #19

of CN303?

Yes

If the cable between the Main board

and Panel has no problem, Replace

the Panel.

Check the power circuit.

Check the connection of

cable.

Check the PC status.

Replace or check related

circuit.

Scaler may have problem.

Replace Main board.

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

4-3

4. Troubleshooting

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

on the monitor

CN101

4-4

IC300

1 2

4. Troubleshooting

4-5

4. Troubleshooting

4-4. No PC (DVI) Video

Symptom The LED power turns on but the screen is blank when the DVI cable is connected.-

Check the DVI cable connections.

Check whether the LVDS cable is connected correctly to the panel.

Major

checkpoints

Check whether the lamp connector of the panel is connected correctly to the IP board.

Check the circuit related DVI input and scaler operation.

X301

X101

r172 r169 r171

Cn303

Diagnostics

Main Board Front

Dose the LED light up when power is

turned on?

Yes

Dose 5V appear at R172?

Yes

Dose the waveform

at R169(SCL) and R171(SDA)?

Yes

Does X101 operates properly?

Yes

Dose the clock appear at R126?

Yes

X301 oscillate properly?

Yes

Check the Power circuit.

Check the connection of

cable.

Check the PC status.

Replace or check related

circuit.

Replace IC104.

Replace or check related

circuit.

Does the clock be entered at Pin #19

of CN303?

Yes

If the cable between the Main board

and Panel has no problem, Replace

the Panel.

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

4-6

Scaler may have problem.

Replace Main board.

4. Troubleshooting

4-4-1. Circuit diagrams and waveforms (DVI) when no screen is displayed on

the monitor

CN103

IC104

4-7

4. Troubleshooting

1 2

3 4

4-8

4-5. Faults and Corrective Actions

Fault Photo Symptoms and Corrective Actions Remarks

Symptoms: DVI signals are not recognized. Causes: This fault occurs when the PC does not

recognize the mode information because the DVI DDC has not been input to the monitor.

Corrective Actions: Input the DVI DDC to the monitor.

* Refer to the Training Manual for

information on inputting the DVI DDC.

4. Troubleshooting

Symptoms: When the monitor is turned on,

only a full white pattern is displayed continually regardless of the signals.

Causes:

Corrective Actions: Replace or reconnect the LVDS

This fault occurs when only the lamp

power is supplied and no video signals are input to the panel due to a fault or incorrect connections of the LVDS cable.

cable correctly so that video signals can be supplied to the panel.

* A full white pattern is a feature of the

TN panel and is displayed when no

video signals are supplied.

4-9

4. Troubleshooting

4-6. Adjustment

4-6-1. Entering Service Mode with Remote Control

Entering Service Mode

- Power Off

INFO

MUTE 1 Power On8 2

FACTORY

(Using factory Remocon)

4-6-2. Service Mode Menu

CALIBRATION Part



PC analog Only ( 1024x768@60 16gray pattern) Color control operates normally only in certain modes of certain patterns, but in other cases, the operation may distort color. Also, color control is not normal when controlling color in a mode other than XGA 60Hz.

Extreme caution needed.!!

Component ( 720p color bar pattern) Color control operates normally only in certain modes of certain patterns, but in other cases, the operation may distort color.

Extreme caution needed.!!

4-10

WHITE BALANCE Part



Sharpness Part



4. Troubleshooting

Used for color control. But excessive setting may saturate the color.

Extreme caution needed.!!

RED / BLUE / GREEN

Adjust the Gain and Offset

Motion Part



Adjusting the sharpness of displayed image.

This function is used to adjust the appropriate value for each target region. Change only when it is needed.

Motion Adaptive De-Interacing

This function reduces image dragging around moving object and relives blinking around suspended object.

MADI QUANT

THRESH / GAIN : MADI QUANT THRESH is 3

divided grade of motion rate. Detecting the motion degree by comparing frames, it controls de-interacing rate.

4-11

4. Troubleshooting

SOUND / PANEL INFO. Part



SPREAD SPECTRUM Part



CM Threshold

The start point of operating carrier mute function.

A2 THRESHOLD

The threshold value of second carrier level recognizing MONO or STEREO.

Display the panel use time and the number of change.

Spread Spectrum Adjustment

The application status of Spread spectrum Amplitude and Period Setting

4-12

4. Troubleshooting

OPTION / RESET CHECKSUM Part

Options PC Cable Detect: When this menu set “Off”, the monitor

dosen’t check the Pin #9 of 15 pin D-sub cable. It is used for some computers opened PC check signal pin.

SW Download Mode: It is possible that micom code and CPU code download with same port (serial), so select the target IC to download “AnalogTV” or “IDTV”

IDTV WatchDog: Micom and CPU communicate continually and the micom send the reset signal to CPU when the CPU stops operating.

Reset: Factory Reset Reset the settings as factory default value. Need to turn the Power On/Off after reset.

CHECKSUM

The 4 digit serial number regarding the Micom(MCU) and MPEG decoder(CPU) code is displayed if you select this.

Indicates the version and date of Micom/CPU code below the service menus.

4-13

+ 64 hidden pages

Samsung 400DXn, 460DXn Schematic

Contents

1. Precautions

1-1. Safety Precautions

1-1-1. Warnings

1-1-2. Servicing the LCD Monitor

1-1-3. Fire and Shock Hazard

1-1-4. Product Safety Notices

1-2. Servicing Precautions

1-2-1 General Servicing Precautions

1-3. Static Electricity Precautions

1-4. Installation Precautions

2-2. Spec Comparison to the Old Models

2-3. Accessories

2-4. Accessories (Sold separately)

3. Disassembly and Reassemble

3-1. Disassembly (400DXn)

3-2. Disassembly (460DXn)

4. Troubleshooting

4-1. Troubleshooting

4-2. No Power

4-4. No PC (DVI) Video

4-5. Faults and Corrective Actions

4-6. Adjustment

4-6-1. Entering Service Mode with Remote Control