Samsung P2050, P2250, P2350 Service manual

LCD-Monitor

Chassis : LLR20ZS

LLR22ZS

LLR23ZS

Model : P2050(G)

P2250(G)

P2350(G)

SERVICE Manual

TFT-LCD Monitor		Contens

1. Precautions

2. Product specifications

3. Disassembly and Reassemble

4. Troubleshooting

5. Exploded View & Part List

6. Wiring Diagram

P2050(G) / P2250(G) / P2350(G)

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 specifications.............................................................................................		2-1
2-1.	Feature & Specifications.................................................................................................	2-1
2-2.	Spec Comparison to the Old Models...............................................................................	2-2
2-3. Accessories.....................................................................................................................		2-3
2-4. Accessories (Sold separately).........................................................................................		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 Does Not Turn On................................................................................	4-2
4-3. When the screen is blank (Analog).................................................................................	4-4
4-4. When a blank screen is displayed (Digital).....................................................................	4-7
4-5. Error Examples and Actions..........................................................................................	4-10
4-6. Adjustment.....................................................................................................................	4-11
5. Exploded View & Part List.......................................................................................	5-1
5-1. Exploded View (P2050)....................................................................................................	5-1
5-2 Parts List (P2050) ............................................................................................................	5-3
5-3. Exploded View (P2250)....................................................................................................	5-6
5-4. Parts List (P2250)............................................................................................................	5-8
5-5. Exploded View (P2350)..................................................................................................	5-11
5-4. Parts List (P2350)..........................................................................................................	5-13
6. Wiring Diagram.........................................................................................................	6-1
6-1. Wiring Diagram - Main Board..........................................................................................	6-1
6-2. Wiring Diagram - IP Board..............................................................................................	6-3
6-3. Connector Functions.......................................................................................................	6-4
6-4. Cables.............................................................................................................................	6-4

GSPN (Global Service Partner Network)

Area	Web Site
North America	http://service.samsungportal.com
Latin America	http://latin.samsungportal.com
CIS	http://cis.samsungportal.com
Europe	http://europe.samsungportal.com
China	http://china.samsungportal.com
Asia	http://asia.samsungportal.com
Mideast & Africa	http://mea.samsungportal.com

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.

© 2009 Samsung Electronics Co.,Ltd. All rights reserved.

Printed in Korea

P/N: BN82-00607A-00

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

Model	P2050(G) / P2250(G) / P2350(G)

Feature

Panel Specifications: 300cd/m2, 2ms, CR 1000:1(DC), 170/160(CR>10)

DPMS : <1W

Magic Bright3, Magic Tune, Windows Vista authentication

DC 50,000: 1 applied

Supports fixed vertical and horizontal ratios

Supports camera effect mode: Black and white/Sepia/Aqua/Green

Specifications

Item			Description
Model	P2050(G)		P2250(G)		P2350(G)
LCD Panel	TFT-LCD panel, RGB vertical stripe, normally white transmissive,
	20”wide Viewable		21.5”wide Viewable		21.5”wide Viewable
	0.2768(H) mm x		0.248(H) mm x		0.2655(H) mm x
	0.2768(V)mm pixel pitch		0.248(V)mm pixel pitch		0.2655(V)mm pixel pitch
Scanning Frequency	Horizontal : 30 kHz ~ 81 kHz (Automatic)
			Vertical: 56 Hz ~ 60 Hz
Display Colors			16.7 Million colors
Maximum resolution	Horizontal: 1600 Pixels		Horizontal: 1920 Pixels		Horizontal: 1920 Pixels
	Vertical: 900 Pixels		Vertical: 1080 Pixels		Vertical: 1080 Pixels
Input Signal	20” Dual		21.5” Dual		23” Dual
Input Sync Signal	Seperate H/V sync, Composite H/V, Sync-on-Green
			Level: TTL level
Maximum Pixel Clock rate			164MHz
Active Display	442.8(H) x 249.075(V)		476.64(H) × 268.11(V)		509.73(H) × 286.74(V)
(Horizontal/Vertical)
AC power voltage & Frequency	AC 110V~130V, 60Hz & AC, 200V~240V 50Hz
Power Consumption	34W		38W		40W
Dimensions Set (W x D x H)	484.6 x 377.3 x 189.4mm		518.2 x 396.7 x 189.4mm		555.8 x 416.2 x 189.4mm
Weight (Set/Package)	4.4Kg		4.4Kg		4.8Kg
Environmental Considerations	Operating Temperature: 10˚C ~ 40˚C(50˚F ~ 104˚F)
	Operating Humidity : 10% ~ 80%
	Operating Temperature: -25˚C ~ 45˚C(-13˚F ~ 113˚F)
		Operating Humidity: 5% ~ 90%

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

2-1

2. Product specifications

2-2. Spec Comparison to the Old Models

	Model	P2050(G) / P2250(G) / P2350(G)	T220 / T220(G)
			T200 / T200(G)

Design

Resolution		1600x900 (P2050)		1680 x 1050
		1920x1080 (P2250/P2350)
Input		Analog / DVI Digital		Analog / DVI Digital
Response Time		2ms		2ms
Viewing Angle		170/160(CR>10)		170/160(CR>10)
Brightness		300cd/m²		300cd/m²
Contrast		50,000:1(DC)		20,000:1(DC)
MagicBright		7 step		7 step
		Magic Color		Magic Color
Feature		Color Effect		Color Effect
		Image Size		Image Size
		Magic Bright3		Magic Bright3
		Magic Tune (Premium)		Magic Tune (Premium)

*Color Effect

-Grey scale: Images are displayed in a grey tone on the screen.

-Green: Images are displayed in a green tone on the screen.

-Aqua: Images are displayed in a blue tone on the screen.

-Sepia: Images are displayed in a brown tone on the screen.

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

2-2

			2. Product specifications
2-3. Accessories
Product	Description	Ccde. No	Remark
	Quick Setup Guide	BN68-01925C
	Warranty Card	BN68-00226R
	(Not available in all locations)
	User’s Guide,
	Monitor Driver,	BN96-10917A
	Natural Color Pro Software
	Stand Body	BN96-10575A
			Samsung Electronics
			Service center
	Stand Base	BN96-09629A
	D-sub Cable	BN39-00244G
	1,500mm(1.5M)
	Power Cord	3903-000042
	1,830mm(1.8M)
	Cleaning Cloth	BN63-02368B
	160mm x 120mm
2-4. Accessories (Sold separately)
Product	Description	Ccde. No	Remark
	DVI Cable	BN39-00246N	Samsung Electronics
	1,500mm(1.5M)		Service center

2-3

2. Product specifications

Memo

2-4

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.Place a soft cloth on a table, place the monitor face down on the table, and separate the stand by holding the Stand Body with both hands while pushing the Stand Body with your thumb.

(At this time, your forefinger must be supporting the bottom of the product.)

Caution : Take care when separating the stand as separating the stand with excessive force by tilting the stand may break the Lock Spring.

2.To separate the front cover, turn the monitor over, insert your fingers into the center between the panel and the front cover of the monitor and then separate the front cover as shown by the figure.

3-1

3. Disassembly and Assembly

Description

Photo

Screws

3.Turn the monitor over again and separate the rear cover.

4. Remove the Shield-Lamp using the jig.

Caution : Take care when doing so as the Shield-

Lamp has sharp edges.

3-2

3. Disassembly and Assembly

Description

Photo

Screws

5.Remove the Function, Lamp Wire and LVDS wires and remove the Shield-Cover.

Caution : Take care when doing so as the Shield-

Lamp has sharp edges.

FUNCTION

LAMP WIRE

LVDS

3-3

3. Disassembly and Assembly

Description

Photo

Screws

6. Separate the LCD panel.

7.Remove the 4 screws from the points marked in the figure.

8.Remove the 4 screws and separate the Bracket Support.

The assembly is in the reverse order of disassembly.

3-4