Samsung S27A750D, S23A750D Service Manual

Liquid crystal display

Chassis: WDQ2 Model: S23A750D

S27A750D

Service Manual

Thin film liquid crystal displays

Contents

S23A750D / S27A750D

1． Matters needing attention

2． Product specifications

3． Disassembly and reassembly

4． Troubleshooting

5． Wiring diagram

Table of Contents

1． Matters needing attention ............................................................................................................... 1-1

1-1 Security considerations................................................................................................................ 1-1

1-2 Maintenance considerations........................................................................................................ 1-2

1-3 Electrostatic sensitive device considerations.................................................................................. 1-3

1-4 Installation notes......................................................................................................................... 1-3

2． Product specifications ...................................................................................................................... 2-1

2-1 Features and specifications .......................................................................................................... 2-1

2-2 Compared with the old model specifications.................................................................................. 2-2

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

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

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

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

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

4-2 When the power supply is not available ........................................................................................ 4-2

4-3 When you monitor black screen (HDMI）..................................................................................... 4-9

4-4 When you monitor black screen (DP）....................................................................................... 4-13

4-5 Examples of faults and corrective actions..................................................................................... 4-17

4-6 Regulation................................................................................................................................ 4-18

5． Wiring diagram................................................................................................................................ 5-1

5-1 The wiring diagram ..................................................................................................................... 5-1

5-2 Power flow chart ........................................................................................................................ 5-2

5-3 Plate connection......................................................................................................................... 5-3

5-4 Connector function ..................................................................................................................... 5-9

5-5 Wiring....................................................................................................................................... 5-9

中国印刷

The repair manual, Samsung Electronics Co., Ltd. all. Unauthorized use of this manual may be subject to applicable international and/Or domestic legal punishment.

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

1-1-2. Servicing the LCD TV Monitor

1. When servicing the LCD TV 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):

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.

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

Disconnect the AC power and DC power jack before servicing.

DEVICE

UNDER

TEST ( READING SHOULD)

NOT BE ABOVE 0.5mA

LEAKAGE

CURRENT

TESTER

TEST ALL

EXPOSED METAL

SURFACES

WIRE CORD

*ALSO TEST WITH

PLUG REVERSED

(

USING AC ADAPTER

PLUG AS REQUIRED)

EARTH

GROUND

1-1

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 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.

1-2. Servicing Precautions

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.

An electrolytic capacitor installed with the wrong polarity might explode.

Before servicing units covered by this service manual, read and follow the Safety

Precautions section of this manual.

1-2

1. 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 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 wrist-strap 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.

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.

1-4. Installation Precautions

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

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

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

4. 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 fire or electric shock.

5. 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 fire or electric shock.

6. Keep the antenna far away from any high-voltage cables and install it firmly. Contact with the highvoltage cable or the antenna falling over may cause fire or electric shock.

7. 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 fire.

Be sure no power is applied to the chassis or circuit and observe all other safety

precautions.

1-3

2. Product specifications

2-1. Feature & Specifications

Feature

ሪ Elegance Touch of Color Design ሪ Energy Saving ሪ Interactive Energy Saving (luminance/proximity sensor) ሪ Deeper Color expression with Dynamic Contrast Ratio ሪ High picture quality and advanced functions

- FHD 120Hz 3D compatibility, 16:9 aspect ratio, high DCR, software optimized to Windows 7, low power consumption, and more

Specifications

Item

Description

Model

S23A750D

S27A750D

LCD Panel

TFT-LCD panel, RGB vertical stripe, normally white transmissive

23” Wide viewable

0.2655(H) x 0.2655(W) mm pixel pitch

27” Wide viewable

0.31125(H) x 0.31125(W) mm pixel pitch

Scanning Frequency

Horizontal: 24 kHz ~ 138 kHz / Vertical: 27 Hz ~ 120 Hz

Display Colors

16.7 million color (Hi-FRC)

Maximum resolution

Horizontal : 1920 pixels Vertical : 1080 pixels

Brightness

250cd/m

300cd/m

Contrast

1000:1

Dynamic Contrast Ratio

MEGA(Typ.)

Supported Resolution

VGA ~ WSXGA+

Input Signal

HDMI , DP Interface

Input Sync Signal

Seperate H/V sync, Composite H/V, Sync-on-Green Level: TTL level

Maximum Pixel Clock rate

300 MHz

-1

Active Display (Horizontal/Vertical)

509.76 (H) x 286.74 (V)

597.6 (H) x 336.15 (V)

AC power voltage & Frequency

AC 110 ~ 240V, 50 ~ 60 Hz

Power Consumption

Typical 45 W / Max 48 W DPMS: Typical 1 watt / Max 1 watt

Typical 53 W / Max 56 W DPMS: Typical 1 watt / Max 1 watt

Dimensions Set (W x D x H)

543.4 x 404.5 x 191.1 mm (with Stand)

543.4 x 321.0 x 18.9 mm (without Stand)

631.2 x 453.9 x 191.1 mm (with Stand)

631.2 x 370.4 x 18.9 mm (without Stand)

Weight Set (After installation Stand)

5.2 Kg (without Stand)

7.6 Kg (with Stand)

4.5 Kg (without Stand)

7.0 Kg (with Stand)

Environmental Considerations

Operating Temperature: 10˚C ~ 50˚C(50˚F ~ 122˚F)

Operating Humidity: 10% ~ 90% Storage Temperature: -20˚C ~ 45˚C(-4˚F ~ 113˚F) Storage Humidity: 5% ~ 90%

Note: Designs and specifications are subject to change without prior notice.

2. Product specifications

2-2. Spec Comparison to the Old Models

Model

[SA750]

S23A750D / S27A750D

[CREAM]

2233RZ

Design

Size

23 "/27"

22 "

Resolution

1920 X 1080

1680 X 1050

DCR

MEGA

20,000:1

IN/OUT

DVI-DL

HDMI

HP-OUT

Function

3D format

compatible

2D -> 3D

3D game compatible (3D Driver)

o (Nvidia)

PS3, X-Box,

BD Player

3D glasses type

Feature

HDCP

Panel

LED

LCD

2-2

2. Product specifications

2-3. Accessories

Product

Description

Code. No

Remark

Safety Guide

BN68-03413A

Samsung Electronics

Service center

Warranty Card

(Not available in all locations)

BH68-00344C User Manual

BN68-03632B

Cleaning Cloth

BN63-02368B

Adapter

BN44-00461A

Power Cord

3903-000598

DP Cable

BN39-01501A

3D Glasses Assy

BN96-18236A

2-3

3-1

3. Disassembly and reassembly

Repair manual this chapter describes the display disassembly and reassembly step.

Warning: This display contains electrostatic sensitive devices. Should use caution when handling these parts.

3-1. Disassembly

Be careful: 1. As before, please turn off the monitor.

2.When removing the display, do not use the open metal tools other than the tools provided.

3.Please follow the steps below carefully remove the display.

Introductions

Pictures

1. As shown and pull the arrow

and remove the bottom cover at the back.

2. According to diagram the

arrows and pull the back cover and remove liner.

3.拆卸和重新组装

3-2

Introductions

Photo caption

3. Disassembly 4 A screw.

4. As backward tilt base as shown in the figure.

5. Removal of the mark shown LVDS Wiring.

Scre

个

3-3

Introductions

Photo caption

6. Remove the front cover as shown in the figure.

7. As shown in Figure remove rear cover.

3.拆卸和重新组装

3-4

Introductions

Photo caption

8. Release 5 Screws and remove the base cover.

9. Release 4 Screws, and remove the printed circuit board.

Introductions

Photo caption

Scre

个

Scre

个

3-5

10. As shown in diagram disassembly and fan hub.

11. As shown in the figure and

remove LVDS Wiring and printed circuit boards.

3.拆卸和重新组装

3-6

Introductions

Photo caption

12. Release 4 A screw, and remove

the hinge at the neck and the base cover.

13. As shown in the figure, and

remove it from the base frame the base Central cover.

Scre

个

3-7

Introductions

Photo caption

14. Release 2 Screws, and remove the fan.

*Reassembly step and disassembly steps instead.

Screw size

Code number

A (mm)

B (mm)

C (mm)

The number of

6001-001114

4 EA

6003-000264

4 EA

6003-001374

4 EA

6006-001096

2 EA

6003-001785

5 EA

Scre

个

4 故障排除

4-1

4 Troubleshooting

4-1. Troubleshooting

1. In front of the repair, set the custom mode as follows:

- Resolution:1920×1080

- Horizontal frequency:67.5 kHz

- Vertical frequency:60 Hz

2. If no image appears, ensure that the power cables are properly connected.

3. Check the following circuit:

- If the screen is black: functional printed circuit board Assembly, printed circuit board assemblies

- If LED Background lights not lit, despite LED Open: check LED Drive, 1 And 2 Connector between the layers and FPC LVDS Wiring

- If W/R/G/B Test chart can display, although the background light is lit: check 60 针 FFC Wiring, 1 And 2 Connector between the layers and FPC LVDS Wiring

4. Press [Menu] Button and change the brightness and contrast 0, Then press and hold“

(Confirmation/Source)”Button for more than 5 Seconds, the display will automatically go to factory reset.

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