Samsung lw22a13w service manual

TFT-LCD TV/MONITOR

Chassis Model PD22EO LW22A13W

Manual

SERVICE

TFT-LCD TV/MONITOR CONTENTS

1. Precautions

2. Product Specifications

3. Disassembly & Reassembly

4. Alignment & Adjustments

5. Troubleshooting

6. Exploded View & Parts List

7. Electrical Parts List

8. Block Diagram

9. Wiring Diagram

10. Schematic Diagrams

11. Panel Description

CONFIDENTIAL

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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 TV 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

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 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.

LW22A13W 1-1

CONFIDENTIAL

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

DEVICE UNDER TEST

TEST ALL

EXPOSED METAL

SURFACES

(READING SHOULD

NOT BE ABOVE 0.5mA)

LEAKAGE CURRENT

TESTER

2-WIRE CORD

ALSO TEST WITH

PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)

EARTH

GROUND

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.

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 wriststrap 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.

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.

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 Precautions

1-2 LW22A13W

CONFIDENTIAL

1-3 Electrostatically Sensitive Devices (ESD) 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.

1-2 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.

CONFIDENTIAL

2 Product Specifications

2-1 Specifications

LCD Panel

TFT-LCD panel, RGB vertical stripe, normally Black, 22-Inch viewable, 0.381 mm x 0.381 mm pixel pitch

Scanning Frequency Horizontal : 30 kHz ~ 48 kHz (Automatic)

Vertical : 60 Hz ~ 75 Hz (Automatic) Display Colors 16.7 Million colors Maximum Resolution Horizontal : 1280 Pixels

Vertical : 720 Pixels Input Video Signal Analog 0.7 Vp-p ± 5% positive at 75 Ω, internally terminated Input Sync Signal Type : Separate H/V

Level : TTL level Maximum Pixel Clock rate 70 MHz Active Display

Horizontal/Vertical AC power voltage & Frequency

AC 90 ~ 264 Volts, 50~60 Hz, DC14V / 8A Power Consumption 90 W (Max) Dimensions

Unit (W x D x H) 23.6 x 7.3 x 18.4 Inches (600 x 185 x 468 mm) Carton (W x D x H) 27.6 x 21.8 x 10.2 Inches (702 x 553 x 260 mm)

Weight (Unit/Gross) 8.8 kg (19.4 lbs) / 15.3 kg (33.7 lbs) Environmental Considerations Operating Temperature : 50 °F ~ 104 °F (10 °C ~ 40 °C)

Humidity : 10 % ~ 80 %

Storage Temperature : -4 °F ~ 113 °F (-20 °C ~ 45 °C)

Humidity : 5 % ~ 95 %

TV System

Antenna Input 75Ω, Coaxial Cable

– MAX Internal speaker Out : Right => 7W

Left => 7W

Sound Characteristic

– BASS Control Range : -12 dB~ + 12 dB

– TREBLE Control Range : -12 dB~ + 12 dB

– Headphone Out: 5mW max (400m Vrms)

– Output Frequency : RF => 80 Hz ~ 15 kHz

A/V => 80 Hz ~ 15 kHz

LW22A13W 2-1

Item

Description

487.68 mm / 274.32 mm

Tuning Frequency Synthesize

System PAL, SECAM, NTSC 4.4

Sound B/G, D/K, I, L, L’

CONFIDENTIAL

2 Product Specifications

2-2 LW22A13W

2-2 Pin Assignments

2-2-1 DVI-I (Analog & Digital)

Ref) DVI-D : Digital only

D-SUB : Analog only

Pin No.

Signal Assignment

Pin No.

Signal Assignment

Pin No.

Signal Assignment

1 2 3 4 5 6 7 8 9

RX2RX2+ GND NC NC DDC Clock (SCL) DDC Data (SDA) Analog Vertical Sync. RX1RX1+

11 12 13 14 15 16 17 18 19 20

GND NC NC DDC Input Power(+5V) Self laster

Output Signal Connection RX0RX0+ GND NC

21 22 23 24 C1 C2 C3 C4

NC GND RXCRXC+ Analog Red Analog Green Analog Blue Analog Horizontal Sync.

1234567 8

9 10111213141516

17 18 19 20 21 22 23 24

C1 C2

DVI-I Receptacle Connector Front View

2 Product Specifications

LW22A13W 2-3

CONFIDENTIAL

CVBS

Audio L

GND

Audio R

GND

Separate

1 2 3 4 5

GND

C GND GND

2-2-4 S-Video

2-2-2 SCART1, SCART2

RCA White

RCA Red

2-2-3 A/V

RCA Yellow

1 2 3 4

5 6 7

9 10 11 12 13 14 15 16 17 18 19 20 21

Items Scart1 Scart2

Audio Out (R;500mV/1KΩ) Audio IN (R;500mV/10KΩ) Audio Out (L;500mV/1KΩ) Audio Common GND Blue GND Audio IN (L;500mV/10K) Blue IN (700mV/75Ω) Function S/W

(0~2V/9, 5V~12V) Green GND No Connection Green IN (700mV/75Ω) No connection Red GND F/B GND Red IN (700mV/75Ω) RGB F/B (0~0, 4V/1~3V) Video Output GND Video Input GND CVBS Out (1V/75Ω) CVBS IN (1V/75Ω) Common GND

O O O O O

O O

O O O O O

O O O O O O

O O

O O O O O O O O O O O O

2 Product Specifications

2-4 LW22A13W

CONFIDENTIAL

2-3 Timing Chart

This section of the service manual describes the timing that the computer industry recognizes as standard for computer-generated video signals.

µs

44.769

17.186

16.086

74.841

µs µs µs µs µs µs µs

µs µs

µs

2-3-1 LCD Panel Mode : 1 mode

✻ N/C : Non-Interlaced, I : Interlaced

2 Product Specifications

LW22A13W 2-5

CONFIDENTIAL

2-3-2 Supported Modes (1)

µs µs µs µs µs µs µs µs

2 Product Specifications

2-6 LW22A13W

CONFIDENTIAL

2-3-2 Supported Modes (2)

µs µs µs µs µs µs µs µs

LW22A13W 3-1

CONFIDENTIAL

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the LW22A13W monitor.

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

these components.

3-1 Disassembly

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.

1. Remove 4 screws of the cover rear.

2. Remove the stand from LCD-TV.

3. Remove 1 screw of the cover rear.

CONFIDENTIAL

3 Disassembly and Reassembly

3-2 LW22A13W

3-2 Reassembly

Reassembly procedures are in the reverse order of Disassembly procedures.

4. Insert a screw driver into upper groove of stand fitting hole and lift up right & left side respectively.

5. Pull the cover rear

CONFIDENTIAL

LW22A13W 4-1

4 Alignments and Adjustments

4-1 General Alignment Instuction

1. Usually, a color TV-VCR needs only slight touch-up adjustment upon installation. Check the basic characteristics such as height, horizontal and vertical sync.

2. Use the specified test equipment or its equivalent.

3. Correct impedance matching is essential.

4. Avoid overload. Excessive signal from a sweep generator might overload the front-end of the TV. When inserting signal markers, do not allow the marker generator to distort test result.

5. Connect the TV only to an DC power source with voltage and frequency as specified on the backcover nameplate.

6. Do not attempt to connect or disconnect any wire while the TV is turned on. Make sure that the power cord is disconnected before replacing any parts.

7. To protect aganist shock hazard, use an isolation transformer.

4 Alignments and Adjustments

4-2 LW22A13W

CONFIDENTIAL

4-2 Factory Mode Adjustments

4-2-1 Entering Factory Mode

1. To enter “Service Mode” Press the remote - control keys in this sequence :

- If you do not have Factory remote - control

- If you have Factory remote - control

4-2-2 Factory Mode Tree

4 Alignments and Adjustments

LW22A13W 4-3

CONFIDENTIAL

Memo

4 Alignments and Adjustments

4-4 LW22A13W

CONFIDENTIAL

LW22A13W 5-1

5 Troubleshooting

5-1 No Power

Does proper DC 14V

appear at Pin 1 of CN205?

Change a 14V adaptor. (BN44-00051C)

LAMP off, Power indicator LED off.

Yes

Check a connection the 14V adapter?

Does proper DC 14V

appear at C847?

Check a connection the 6 Pin hamess and change a input board assy. (BN59-00339A)

Yes

Does proper DC +3.3V_A,

+3.3V_B appear at

C826, C867?

IC801 or IC805 are bad.

Change main assy. (BN94-00400A)

Yes

Does proper DC +2.5V_A,

+2.5V_B appear at

C827, C813?

IC802 or IC806 are bad.

Change main assy. (BN94-00400A)

Yes

Does proper DC +5V_A, +5V,

+5V_LVDS appear at

C889, C865, CP133?

IC810 or IC804 or ICP22 are bad.

Change main assy. (BN94-00400A)

Yes

Does proper DC +12V_3

appear at C841?

ICP23 is bad.

Change main assy. (BN94-00400A)

Yes

Does proper DC +8V

appear at C843?

IC843 is bad.

Change main assy. (BN94-00400A)

Yes

A power is supplied to set.

Check a other function. (No picture part)

Replace a assy LCD panel. (BN91-00388L)

5 Troubleshooting

5-2 LW22A13W

CONFIDENTIAL

1 2 3

4 5 6

WAVEFORMS

5 Troubleshooting

LW22A13W 5-3

CONFIDENTIAL

5-2 No Video (Analog PC Signal)

Check the PC signal and check

connection of FPC DVI cable?

Input a analog signal and

connected cable.

Power indicator is green,

Lamp on, No video.

Yes

Does the signal appear at

#18, 16, 14 (R, G, B) of CN100?

Change FPC cable (CN100) or change a

input board assy. (BN59-00339A)

Yes

Does the signal appear at

output of IC350?

(#70_R, #2_G, #12_B)

IC350 is bad.

Change main board assy. (BN94-00400A)

Yes

Does the signal appear at

output of [#1_R(IC001),

#1_G(ICP19), #15_B(IC001)]?

IC001 or ICP18 or ICP19 are bad.

Change main board assy. (BN94-00400A)

Yes

Does the signal appear at CR01,

CG01, CB01 of R, G, B output?

IC200 is bad.

Change main board assy. (BN94-00400A)

Yes

Does the clock pulse appear at

output of RA311~RA313?

IC300 or IC901 are bad.

Change main board assy. (BN94-00400A)

Yes

Check a LVDS cable.

Replace a assy LCD panel.

(BN91-00388L)

Please, call to Samsung Co, LTD.

5 Troubleshooting

5-4 LW22A13W

CONFIDENTIAL

8 9 10

11 12

WAVEFORMS

5 Troubleshooting

LW22A13W 5-5

CONFIDENTIAL

5-3 No Video (Digital PC Signal)

Check the PC signal and check

connection of FPC DVI cable?

Input a digital signal and

connected cable.

Power indicator is green,

Lamp on, No video.

Yes

Does the clock pulse appear at

#5~12 (Data, Clk +/-) of CN100?

Change FPC cable. (CN100)

Change a input board assy. (BN59-00339A)

Yes

Does the clock pulse appear at

output at Rap18~RAP21,

Rap28, 29 of ICP18, ICP19?

ICP01 is bad.

Change main board assy. (BN94-00400A)

Yes

Does the signal appear at

output of [#1_R(IC001),

#1_G(ICP19), #15_B(IC001)]?

IC001 or ICP18 or ICP19 are bad.

Change main board assy. (BN94-00400A)

Yes

Does the signal appear at CR01,

CG01, CB01 of R, G, B output?

IC200 is bad.

Change main board assy. (BN94-00400A)

Yes

Does the clock appear at output of RA311~RA313?

IC300 or IC901 are bad.

Change main board assy. (BN94-00400A)

Yes

Check a LVDS cable.

Replace a assy LCD panel.

(BN91-00388L)

Please, call to Samsung Co, LTD.

5 Troubleshooting

5-6 LW22A13W

CONFIDENTIAL

13 14 15

16 17

WAVEFORMS

5 Troubleshooting

LW22A13W 5-7

CONFIDENTIAL

5-4 No Picture (Tuner_CVBS)

Does the signal appear at R2?

Check the DC voltage. (#4 of tuner) : 10V~33V

Change a input board assy. (BN59-00339A)

Power indicator is off,

Lamp on, No picture.

Yes

Connect the RF cable and

check RF signal.

Does the signal appear at

C042(#1) of input?

Change FPC cable. (CN101)

Change a input board assy. (BN59-00339A)

Yes

Does the clock pulse appear at

3230Y, C_OUT(0:7) of IC010?

IC010 is bad.

Change main board assy. (BN94-00400A)

Yes

Does the clock pules appear at

output of IC002~IC005?

IC001 or ICP18 are bad.

Change main board assy. (BN94-00400A)

Yes

Does the signal appear at CR01,

CG01, CB01 of R, G, B output?

IC200 is bad.

Change main board assy. (BN94-00400A)

Yes

Does the clock appear at output of RA311~RA313?

IC300 or IC901 are bad.

Change main board assy. (BN94-00400A)

Yes

Check a LVDS cable.

Replace a assy LCD panel.

(BN91-00388L)

Please, call to Samsung Co, LTD.

5 Troubleshooting

5-8 LW22A13W

CONFIDENTIAL

18 19 20

21 22 23

WAVEFORMS

5 Troubleshooting

LW22A13W 5-9

CONFIDENTIAL

5-5 No Picture (Video_CVBS)

Does the signal appear at R8?

Change s video cable.

Change a input board assy. (BN59-00339A)

Power indicator is off,

Lamp on, No picture.

Yes

Connect the video cable.

Operating a video player.

Does the signal appear at

C046(#8) of input IC011?

Change FPC cable. (CN101)

Change a input board assy. (BN59-00339A)

Yes

Does the clock pulse appear at

output of IC006~IC009?

IC010 is bad.

Change main board assy. (BN94-00400A)

Yes

Does the clock pules appear at

output of IC002~IC005?

IC001 or ICP18 are bad.

Change main board assy. (BN94-00400A)

Yes

Does the signal appear at CR01,

CG01, CB01 of R, G, B output?

IC200 is bad.

Change main board assy. (BN94-00400A)

Yes

Does the clock pulse appear at

output of RA311~RA313?

IC300 or IC901 are bad.

Change main board assy. (BN94-00400A)

Yes

Check a LVDS cable.

Replace a assy LCD panel.

(BN91-00388L)

Please, call to Samsung Co, LTD.

5 Troubleshooting

5-10 LW22A13W

CONFIDENTIAL

24 25 26

27 28 29

WAVEFORMS

5 Troubleshooting

LW22A13W 5-11

CONFIDENTIAL

5-6 No Picture (S-Video_Y, C)

Does the signal

appear at R9, R10 (Y, C)?

Chagne a S-Video cable.

Change a input board assy. (BN59-00339A)

Power indicator is off,

Lamp on, No picture.

Yes

Connect the S-Video cable.

Operating a video player.

Does the signal appear at

C044(#5, Y), C045(#6, C) of

input IC011?

Change FPC cable. (CN101)

Change a input board assy. (BN59-00339A)

Yes

Does the clock pulse appear at

output of IC006~IC009?

IC010 is bad.

Change main board assy. (BN94-00400A)

Yes

Does the clock pulse appear at

output of IC002~IC005?

IC001 or ICP18 are bad.

Change main board assy. (BN94-00400A)

Yes

Does the signal appear at CR01,

CG01, CB01 of R, G, B output?

IC200 is bad.

Change main board assy. (BN94-00400A)

Yes

Does the clock pulse appear at

output of RA311~RA313?

IC300 or IC901 are bad.

Change main board assy. (BN94-00400A)

Yes

Check a LVDS cable.

Replace a assy LCD panel.

(BN91-00388L)

Please, call to Samsung Co, LTD.

5 Troubleshooting

5-12 LW22A13W

CONFIDENTIAL

30 31 32

33 34 35

WAVEFORMS

5 Troubleshooting

LW22A13W 5-13

CONFIDENTIAL

5-7 No Picture (SCART1, 2_CVBS : Low Resolution)

Does the signal appear at R98, R102 (SC1, 2 CVBS)?

Chagne a scart cable.

Change a input board assy. (BN59-00339A)

Power indicator is off,

Lamp on, No picture.

Yes

Connect the scart cable.

Operating a video player.

Does the signal appear at

C043(#3, SC1), C048(#10, SC2)

of input IC011?

Change FPC cable. (CN102)

Change a input board assy. (BN59-00339A)

Yes

Does the clock pulse appear at

output of IC006~IC009?

IC010 is bad.

Change main board assy. (BN94-00400A)

Yes

Does the clock pulse appear at

output of IC002~IC005?

IC001 or ICP18 are bad.

Change main board assy. (BN94-00400A)

Yes

Does the signal appear at CR01,

CG01, CB01 of R, G, B output?

IC200 is bad.

Change main board assy. (BN94-00400A)

Yes

Does the clock pulse appear at

output of RA311~RA313?

IC300 or IC901 are bad.

Change main board assy. (BN94-00400A)

Yes

Check a LVDS cable.

Replace a assy LCD panel.

(BN91-00388L)

Please, call to Samsung Co, LTD.

+ 67 hidden pages