samsung tv_lcd_le40s71b_chassis_gsm40se.pdf

TFT-LCD TV

Chassis

GSM27SE

GSM32SE

GSM37SE

GSM40SE

Model

LE27S71B

LE32S71B

LE37S71B

LE40S71B

SERVICE

Manual

TFT-LCD TV

Fashion Feature

- Luxurious Slim Design

- Supreme Picture Quality

- Supreme Sound Quality

- Supreme Convenience Quality

- Convenience for Users

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

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

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.

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

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 instruments ground lead to the

instrument chassis ground before connecting the

positive lead; always remove the instruments ground

lead last.

Precautions

1. Always unplug the units 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.

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.

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

1 Precautions

1-4 Installation Precautions

1. For safety reasons, more than two people are

required for carrying the product.

6. Keep the antenna far away from any high-voltage

cables and install it firmly. Contact with the high-

voltage cable or the antenna falling over may

cause fire or electric shock.

2. Keep the power cord away from any heat emitting

devices, as a melted covering 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.

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.

1-3

2 Product Specifications

2 Product specifications

2-1 Fashion 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

-DNIe technology provides life-like clear images.

Dynamic Contrast

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

SRS TruSurround XT

-SRS TruSurround XT provides a virtual Dolby surround system.

Convenience

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

2-1

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