Samsung S27A350H, S24A350H, S23A350H, S22A350H, L3S27HS Service Manual

LCD-Monitor

Chassis : L3S22HS

L3S23HS

L3S24HS

L3S27HS

Model : S22A350H

S23A350H

S24A350H

S27A350H

SERVICE Manual

TFT-LCD Monitor		Contens

1. Precautions

2. Product specifications

3. Disassembly and Reassemble

4. Troubleshooting

5. Wiring Diagram

S22A350H / S23A350H /

S24A350H / S27A350H

Contents
1. Precautions
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 specifications
2-1. Feature & Specifications.................................................................................................	2-1
2-2. Spec Comparison to the Old Models...............................................................................	2-3
2-3. Accessories.....................................................................................................................	2-4
2-4. Accessories (Sold separately).........................................................................................	2-5
3. Disassembly and Assembly
3-1. Disassembly....................................................................................................................	3-1
4. Troubleshooting
4-1. Troubleshooting...............................................................................................................	4-1
4-2. When the Power Does Not Turn On................................................................................	4-2
4-3. When the screen is blank (Analog).................................................................................	4-4
4-4. When a blank screen is displayed (HDMI)......................................................................	4-7
4-5. Error Examples and Actions..........................................................................................	4-10
4-6. Adjustment.....................................................................................................................	4-11
5. Wiring Diagram
5-1. Wiring Diagram - Main Board..........................................................................................	5-1
5-2. Board Connection - Main Board......................................................................................	5-2
5-3. Connector Functions.......................................................................................................	5-3
5-4. Cables.............................................................................................................................	5-3

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.

© 2010 Samsung Electronics Co.,Ltd. All rights reserved.

Printed in Korea

3. Disassembly and Assembly

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.	Disassemble the monitor carefully as directed in the following procedures.
		Description	Photo	Screws

1. Remove the stand body shown in the figure.

2.Turn the monitor over and insert your hands into the top of the monitor at the center and separate the front cover in the direction of the arrow as shown in the figure.

Separate the sides of the front cover up to the directed line as shown in the figure.

3.Remove the LVDS, LAMP wire, FUNCTION cable, and then remove the SHIELD-COVER.

4. Remove the LCD panel.

3-1

3. Disassembly and Assembly

Description

Photo

Screws

5.Remove the main PCB from the SHIELDHOLDER.

6. We get the PBA.

Reassembly procedures are in the reverse order of disassembly procedures.

3-2

1. Precautions

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.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 resistorcapacitor 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).

(READING SHOULD)

NOT BE ABOVE 0.5mA

				LEAKAGE
DEVICE
				CURRENT
UNDER
				TESTER
TEST
	TEST ALL
	EXPOSED METAL
	SURFACES
2-WIRE CORD

*ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)	EARTH
	GROUND	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 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.

1-1

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 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.

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. 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.

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.

1-3

1. Precautions

Memo

1-4

2. Product specifications

2. Product specifications

2-1. Feature & Specifications

Feature

Panel Speciications

S22A350H, S23A350H, S24A350H : 250 cd/m2 , 2 ms, CR 1000:1, 170/160 (CR>10) S27A350H : 300 cd/m2, 2 ms, CR 1000:1, 170/160 (CR>10)

DPMS

S22A350H, S23A350H, S24A350H : Typical 0.3W / Max 0.4W S27A350H : Typical 0.5W / Max 0.6W

Off-Timer function for reducing standby power usagesWindows Vista/Windows 7 authentication

HDMI with HDCP

Picture;a screen size desire

Supported Magic Bright3 / Eco Saving / Magic Angle / Image Size

Specifications

	Item	Description
	Model	S22A350H	S23A350H
	LCD Panel	TFT-LCD panel, RGB vertical stripe, normally white transmissive
		21.5” Wide viewable	23” Wide viewable
		0.24825(H) x 0.24825(V)mm Pixel Pitch	0.2655(H) x 0.2655(V)mm Pixel Pitch
	Scanning Frequency	Horizontal : 30kHz ~ 81kHz (Automatic)
		Vertical: 56Hz ~ 75Hz
	Display Colors	16.7 Million colors
	Maximum resolution	Horizontal: 1920 Pixels
		Vertical: 1080 Pixels
	Input Signal	Analog / HDMI with HDCP
	Input Sync Signal	Separate H/V sync, Composite H/V, Sync-on-Green
		Level:TTL level
	Maximum Pixel Clock rate	164Mhz
	Active Display	476.64(H) x 268.11(V)	509.76(H) x 286.74(V)
	(Horizontal/Vertical)
	AC power voltage & Frequency	AC 100V~240V,50Hz~60Hz
	Power Consumption	Typical 23W / Max 25W	Typical 29W / Max 32W
	Dimensions Set	523.9 X 327.7 X 59.0 mm	555.7 X 346.6 X 59.2 mm
	(W X H X D)	(Without Stand)	(Without Stand)
		523.9 X 406.9 X 239.6 mm	555.7 X 426.4 X 239.2 mm
		(With Stand)	(With Stand)
	Weight Set	Set : 2.70kg	Set : 2.65kg
	(After installation Stand)	(Without Stand)	(Without Stand)
		3.15kg (With Stand)	3.10kg (With Stand)
	Environmental Considerations	Operating Temperature: 10˚C ~ 40˚C(50˚F ~ 104˚F)
		Operating Humidity : 10% ~ 80%
		Storage Temperature: -25˚C ~ 45˚C(-13˚F ~ 113˚F)
		Storage Humidity: 5% ~ 90%

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

2-1

2. Product specifications

Specifications

	Item	Description
	Model	S24A350H	S27A350H
	LCD Panel	TFT-LCD panel, RGB vertical stripe, normally white transmissive
		24” Wide viewable	27” Wide viewable
		0.27675(H)x0.27675(V)mm Pixel Pitch	0.31125(H) x 0.31125(V)mm Pixel Pitch
	Scanning Frequency	Horizontal : 30kHz ~ 81kHz (Automatic)
		Vertical: 56Hz ~ 75Hz
	Display Colors	16.7 Million colors
	Maximum resolution	Horizontal: 1920 Pixels
		Vertical: 1080 Pixels
	Input Signal	Analog / HDMI with HDCP
	Input Sync Signal	Separate H/V sync, Composite H/V, Sync-on-Green
		Level:TTL level
	Maximum Pixel Clock rate	164Mhz
	Active Display	531.36(H) x 298.891(V)	597.6(H) X 336.15(V)
	(Horizontal/Vertical)
	AC power voltage & Frequency	AC 100V~240V,50Hz~60Hz
	Power Consumption	Typical 27W / Max 30W	Typical 29W / Max 32W
	Dimensions Set	578.6 X 359.1 X 59.2 mm	654.0 X 405.6 X 60.3 mm
	(W X H X D)	(Without Stand)	(Without Stand)
		578.6 X 438.7 X 239.2 mm	654.0 X 483.0 X 249.2 mm
		(With Stand)	(With Stand)
	Weight Set	Set : 3.45kg	Set : 4.10kg
	(After installation Stand)	(Without Stand)	(Without Stand)
		3.90kg (With Stand)	4.80kg (With Stand)
	Environmental Considerations	Operating Temperature: 10˚C ~ 40˚C(50˚F ~ 104˚F)
		Operating Humidity : 10% ~ 80%
		Storage Temperature: -25˚C ~ 45˚C(-13˚F ~ 113˚F)
		Storage Humidity: 5% ~ 90%

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

2-2

2. Product specifications

2-2. Spec Comparison to the Old Models

		SA350	50series
	Model	(S22A350H / S23A350H /
			(BX2250 / BX2350 / BX2450)
		S24A350H / S27A350H)

Design

Resolution		1920 X 1080		1920 X 1080
Input		Analog / HDMI with HDCP		Analog / HDMI with HDCP
Response Time		2ms(G to G)		2ms(G to G)
Viewing Angle		170/160(CR>10)		170/160(CR>10)
		250 cd/m²
Brightness		(S22A350H / S23A350H / S24A350H)		250 cd/m²
		300 cd/m² (S27A350H)
Contrast		MEGA:1(DCR)		MEGA:1(DCR)
MagicBright		5 step		5 step
		Magic Angle		MagicAngle
				Image Size
		Image Size		Magic Bright3
Feature		Magic Bright3		Picture Mode
		Magic Tune		Magic Tune
		Eco Saving		Magic ECO
		Win7		Magic Return
				Win7

2-3