SAMSUNG CKG7507LXX Service Manual

Manual

SERVICE

COLOR MONITOR CONTENTS

COLOR TEMP.

1. Precautions

2. Reference Information

3. Product Specifications

4. Operating Instructions

5. Disassembly & Reassembly

6. Alignment & Adjustments

7. Troubleshooting

8. Exploded View & Parts List

9. Electrical Parts List

10. Block Diagram

11. PCB Diagrams

12. Wiring Diagram

13. Schematic Diagrams

COLOR MONITOR

CKG7507L (SyncMaster 700s )

Samsung Electronics Co., Ltd. March 1998 Printed in Korea Code No.: BH68-60985A

WARNINGS

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

2. Disconnect the AC power before servicing.

3. When the chassis is operating, semiconductor heatsinks are potential shock hazards.

1-1-1 Servicing the High Voltage VR

and CRT :

WARNING: A high voltage VR replaced in the wrong

direction may cause excessive X-ray emissions.

Caution:

When replacing the high voltage adjustment VR, it must be fixed by a soldering iron after it is properly set.

1. When servicing the high voltage system, remove the static charge by connecting a 10 kohm resistor in series with an insulated wire (such as a test probe) between the chassis and the anode lead.

2. If the HV VR requires adjustment, (a) Replace the VR and adjust the high voltage to the specification. (b) Use a soldering iron to melt the adjustment cap on the HV VR to prevent any movement.

3. When troubleshooting a monitor with excessively HV, avoid being unnecessarily close to the monitor. Do not operate the monitor for longer than is necessary to locate the cause of excessive voltage.

4. High voltage should always be kept at the rated value, no higher. Only when high voltage is excessive are X-rays capable of penetrating the shell of the CRT, including the lead in glass material. Operation at high voltages may also cause failure of the CRT or high voltage circuitry.

5. When the HV regulator is operating properly, there is no possibility of an X-ray problem. Make sure the HV does not exceed its specified value and that it is regulating correctly.

6. The CRT is especially designed to prohibit X-ray emissions. To ensure continued X-ray protection, replace the CRT only with one that is the same or equivalent type as the original.

7. Handle the CRT only when wearing shatterproof goggles and after completely discharging the high voltage anode.

8. Do not lift the CRT by the neck.

1-1-2 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).

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.

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.

Components identified by on schematics and parts lists must be sealed by a soldering iron after replacement and adjustment.

CKG7507L 1-1

1 Precautions

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. Servicing precautions are printed on the cabinet, and should be followed closely.

2. Always unplug the unit’s AC power cord from the AC power source before attempting to: (a) remove or reinstall any component or assembly, (b) disconnect PCB plugs or connectors, (c) connect all test components in parallel with an electrolytic capacitor.

3. 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.

4. 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.

5. Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels, input terminals and earphone jacks).

6. 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.

7. Never defeat any of the +B voltage interlocks. Do not apply AC power to the unit (or any of its assemblies) unless all solid-state heat sinks are correctly installed.

8. 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.

9. Indicates ESDs on the Schematic Diagram in this manual.

1 Precautions

1-2 CKG7507L

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 devices are integrated circuits and some fieldeffect transistors. The following techniques will reduce the incidence of component damage caused by static electricity.

1-2 Servicing Precautions

WARNING1: First read the “Safety Precautions” section of this manual. If unforeseen circumstances

create conflict between the servicing precautions and safety precautions, always follow the safety precautions.

WARNING2: A high voltage VR replaced in the wrong direction may cause excessive X-ray

emissions.

WARNING3: An electrolytic capacitor installed with the wrong polarity might explode.

CKG7507L 2-1

2 Reference Information

2-1 List of Abbreviations, Symbols and Acronyms

2-1-1 Abbreviations

Abbreviation Definition Abbreviation Definition

ASS’Y Assembly B Blue B+ ADJ B+ Adjustment B-CUT Blue-Cutoff B-GAIN Blue Gain BRIGHT Brightness C R-Composition C-MIC Condenser Microphone CLK Clock CM R-Cement CN Connector CONT Contrast D-SUB D-Subminiature EEP-CLK Electrically Erasable and

Programmable Clock EXT External EXT-MIC External Microphone Freq. Frequency FU Fusible G Green G-CUT Green-Cutoff G-GAIN Green Gain GND Ground H Horizontal H Heater H-DRV Horizontal Drive H-DY Horizontal Deflection York H-FLB Horizontal Flyback H-FV Horizontal-Feedback Voltage H-LIN Horizontal Linearity H-POSI Horizontal Position H-SIZE Horizontal Size H/PHONE Headphone Hz Hertz I-SENSE Current-Sense lb Pound MAX Maximum MIC Microphone MIN Minimum MP C-Metalized Polyester MPP Metal Polypropylene MO R-Metal Oxide

OSC Oscillator P C-Polyester PARA Parabola PARALL Parallelogram PIN-BAL Pincushion Balance PRE-AMP Pre-Amplifier PS1 Power Saving1 (suspend) PS2 Power Saving2 (off) PWR Power R Red R-CUT Red-Cutoff R-GAIN Red Gain RST Reset S-PIN Side Pincushion S-RASTER Self Raster S/W Switch SCAP S Correction Capacitor SPK Speaker SYNC Synchronization T C-Tantalum TR Transistor TRAP Trapezoid U-COM Microprocessor V Vertical V-DY Vertical Deflection York V-FLB Vertical Flyback V-LIN Vertical Linearity V-MUTE Video Mute V-OUT Vertical Output V-PARA Vertical Parabola V-POL V-Polarity V-POSI Vertical Position V-SENSE Voltage-Sense V-SIZE Vertical Size WW R-Wire Wound X-TAL Crystal Ω ohm KΩ 1000 ohm MΩ 1000 KΩ uF microfarad (10-6F) nF nanofarad (10-9F) pF picofarad (10

-12

CKG7507L 3-1

3 Product Specifications

3-1 Specifications

Picture Tube: 17-Inch (43 cm): 15.7-inch (39.80 cm) viewable; Full-square flat-face tube, 90˚ Deflection,

0.28 mm Dot pitch, Semi- tint, Non-glare, Invar shadow mask, Anti-static silica coating

Scanning Frequency Horizontal : 30 kHz to 70 kHz (Automatic)

Vertical : 50 Hz to 160 Hz (Automatic)

Display Colors Unlimited colors

Maximum Resolution Horizontal : 1280 Dots

Vertical : 1024 Lines

Input Video Signal Analog, 0.714 Vp-p positive at 75 Ω, internally terminated

Input Sync Signal Separate Sync : TTL level positive/negative

Composite Sync : TTL level positive/negative

Maximum Pixel Clock rate 110 MHz

Active Display Horizontal : 306 mm ± 3 mm (4:3 ratio)

Vertical : 230 mm ± 3 mm

Input Voltage AC 90 to 264 Volts, 60 Hz or 50 Hz ± 3 Hz

DC Output DC 12 Volt (CKG7507LM)

Power Consumption 100 Watt (max)

Dimensions Unit (W x D x H) 16.7 x 17.5 x 16.7 Inches (424 x 446 x 425 mm) Carton (W x D x H) 21.5 x 21.9 x 21.2 Inches (545 x 554 x 538 mm)

Weight 38.7 lbs (17.4 kg) / 48.5 lbs (22.0 kg)

Environmental Considerations Operating Temperature : 32°F to 104°F (0°C to 40°C)

Humidity : 10 % to 80 % Storage Temperature : -4°F to 113°F (-20°C to 45°C)

Humidity : 5 % to 95 %

• Above models comply with SWEDAC (MPR II) recommendations for reduced electromagnetic fields.

• Designs and specifications are subject to change without prior notice.

Item Description

3 Product Specifications

3-2 CKG7507L

3-2 Pin Assignments

Sync Type

Pin No.

15-Pin Signal Cable Connector (Figure 3-1)

Cable Adapter (Figure 3-2)

Macintosh

Separate Composite

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15

Red Green Blue GND DDC Return GND-R GND-G GND-B Reserved GND-Sync/Self-raster GND DDC Data H-Sync V-Sync DDC Clock

Red Green Blue GND DDC Return GND-R GND-G GND-B Reserved GND-Sync/Self-raster GND DDC Data H/V-Sync Not Used DDC Clock

GND-R Red H/V Sync Sense 0 Green GND-G Sense 1 Reserved Blue Sense 2 GND V-Sync GND-B GND H-Sync

Figure 3-1. Male Type Figure 3-2. Male Type

3 Product Specifications

CKG7507L 3-3

800/85Hz

800 x 600

800/75 Hz 800 x 600

640/75 Hz 640 x 480

VGA3/60 Hz

640 x 480

VGA2/70 Hz

720 x 400

QRS

Video

Sync

Horizontal

Vertical

CDE

Video

Sync

Separate Sync

Table 3-1. Timing Chart

fH (kHz) A µsec B µsec C µsec D µsec E µsec fv (Hz) O msec P msec Q msec R msec S msec Clock

Freq. (MHz)

Polarity H.Sync

V.Sync Remark

31.469

31.778

3.813

1.907

25.422

0.636

70.087

14.268

0.064

1.080

12.711

0.413

28.322

Negative

Positive

Separate

31.469

31.778

3.813

1.907

25.422

0.636

59.940

16.683

0.064

1.048

15.253

0.318

25.175

Negative Negative Separate

37.500

26.667

2.032

3.810

20.317

0.508

75.000

13.333

0.080

0.427

12.800

0.027

31.500

Negative Negative Separate

53.674

18.631

1.138

2.702

14.222

0.569

85.061

11.756

0.056

0.503

11.179

0.019

56.250

Positive Positive

Separate

46.875

21.333

1.616

3.232

16.162

0.323

75.000

13.333

0.064

0.448

12.800

0.021

49.500

Positive Positive

Separate

Mode

IBM VESA

Timing

3-3 Timing Chart

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

C D

Video

Sync

Video

Q R S

A : Line time total B : Horizontal sync width O : Frame time total P : Vertical sync width C : Back porch D : Active time Q : Back porch R : Active time E : Front porch S : Front porch

VIDEO

Horizontal

Vertical

H/V Composite Sync

60.023

16.660

1.219

2.235

13.003

0.203

75.029

13.328

0.050

0.466

12.795

0.017

78.750

Positive Positive

Separate

49.726

20.110

1.117

3.910

14.524

0.559

74.551

13.414

0.060

0.784

12.549

0.020

57.284

Negative Negative

Composite

68.677

14.561

1.016

2.201

10.836

0.508

84.997

11.765

0.044

0.524

11.183

0.015

94.500

Positive Positive

Separate

Apple MAC.

1024/75 Hz 1024 x 768

832/75 Hz

832 x 624

1024/85 Hz 1024 x 768

Memo

3 Product Specifications

3-4 CKG7507L

2 Reference Information

2-2 CKG7507L

Acronym Definition Acronym Definition

ABL Automatic Brightness Limits AC Alternating Current ACL Automatic Contrast Limit AFC Automatic Frequency Control ANSI American National Standards Institute CMOS Complementary Metal Oxide

Semiconductor CRT Cathode Ray Tube DC Direct Current DDC Data Display Channel DF Dynamic Focus DMM Digital Multimeter DPMS Display Power Management Signaling DVM Digital Voltmeter DY Deflection York EEPROM Electrically Erasable and

Programmable Read only Memory ESD Electrostatically Sensitive Device ESF Electronic Static Field FBT Flyback Transformer FET Field Effect Transistor FH Horizontal Frequency FS Fail Safe FV Vertical Frequency GD Geometric Distortion

H/V Horizontal/Vertical HV High Voltage I/O Input/Output IC Integrated Circuit LED Light Emitting Diode MAC Macintosh MOFA Mask Outside Frame Assemble OCP Over Current Protection OP AMP Operational Amplifier OSD On Screen Display P-P Peak to Peak PCB Printed Circuit Board PLL Phase Locked Loop PWM Pulse Width Modulation SMPS Switch Mode Power Supply SVGA Super Video Graphics Array SWEDAC TP Test Point UL Underwriters Laboratories USB Universal Serial Bus VESA Video Electronics Standard

Association VGA Video Graphics Array VR Variable Registor W/B White Balance

2-1-2 Acronyms

2-1-2 Symbols

Can emit X-radiation Hot Ground Cold Ground Electrostatically Sensitive Device (ESD) Provides special safety considerations

4-1 Front View and Control

4-1-1 CKG7507L Front View

4-1-2 On Screen Display

This monitor features an On-Screen Display (OSD) that shows information about the display setting. The OSD appears on the screen when you select a function button. The OSD shows the name, range and current setting of the control function. In addition, the OSD shows the current input signal frequency and the list of user and factory preset timings. The OSD remains active for approximately 8 seconds after the completion of any adjustment.

CKG7507L 4-1

4 Opearating Instructions

COLOR TEMP.

Location Symbol Description

1 Power Button

Power Indicator LED (Dual Color) Contrast Control Brightness Control

Adjustment Buttons Pinbalance and Vertical Linearity

Degauss Button Recall Button Color Temperature Control

G/D (Geometric Distortion) Push once: Pincushion/Trapezoid

Push twice: Parallelogram/Tilt

Size (Horizontal/Vertical)

Position and Modes Push once: Position (Horizontal/Vertical)

Push twice: User and Preset Modes

11 12

8 9

COLOR

TEMP

2 3 4

COLOR TEMP.

5 6 7

Table 4-1. Front Panel Controls

Figure 4-1. Front Control Panel

Note 1:This monitor requires a cable adapter for

use with a Macintosh computer. The MacMaster Cable Adapter supports all monitors and all Macintosh, Centris, Quadra, Duo Dock, and Power Macintosh computers. If you do not already have a cable adapter, check with your computer dealer.

Note 2:When used with a computer equipped

with VESA DPMS functions, this monitor is EPA Energy Star compliant and NUTEK compliant.

Table 4-2. Display Power Management Signaling (DPMS)

4 Operating Instructions

4-2 CKG7507L

State

Items

Normal

Operation

Horizontal Sync Vertical Sync Video

Power Indicator

Power Consumption/hr

Active Active Active

Green Amber

Alternating

Amber/Green

Blinking

Amber

Blinking

100 W (max.)

80.8 W

(nominal)

Less than

15 W

70 W (max.)

66.5 W

(nominal)

Less than

8 W

Inactive

Active

Blanked

Active Inactive Blanked

Power saving function EPA/NUTEK

Stand-By

Mode

Suspend Mode

Position A

Power Off Mode

Position B

Inactive Inactive Blanked

5-1-1 Cabinet Disassembly

1. With a pad beneath it, stand the monitor on its front with the screen facing downward and the base close to you. Make sure nothing will damage the screen.

2. Working from the back of the monitor, remove the 4 screws and carefully pull the rear cabinet up and off the monitor.

3. Remove the 4 screws on the Bottom Cover and pull it upward to remove it.

4. Remove the 16 screws on the Top Shield and remove it.

5. Using pinch-nosed pliers or long-nosed pliers, carefully disconnect the Anode Cap from the CRT.

5-1-2 Removing the Video PCB

1. Follow steps 1 through 5 in “Cabinet Disassembly,” above.

2. Disconnect connectors CN102, CN105 and CN106 on the Video PCB.

3. Remove both side screws on the lower edge of the Video PCB Ass’y and the screw on the signal connector and pull the assembly towards you to remove it.

4. Remove all screws on the Video PCB Ass’y and remove the Video Shield.

5. Lift out the Video PCB and place it on a flat, level surface that is protected from static electricity.

5-1-3 Removing the CRT Socket PCB

1. Follow steps 1 through 5 in “Cabinet Disassembly,” and steps 1 through 5 in “Removing the Video PCB,” above.

2. Disconnect connectors CN13 and CN14 on the CRT Socket PCB.

3. Lift off the CRT Socket PCB Ass’y.

4. Hold the CRT Socket PCB Ass’y while you lift the cap on the CRT Socket and pull out the two focus wires.

5-1-4 Removing the Main PCB

1. Follow steps 1 through 5 in “Cabinet Disassembly,” steps 1 through 5 in “Removing the Video PCB,” and steps 1 through 4 in “Removing the CRT Socket PCB,” above.

2. Disconnect the Degaussing Coil at CN602 on the Main PCB.

3. Disconnect all easily accessible ground wires from the Main PCB and Bottom Chassis.

4. Disconnect the DY connector between the DY and the CN301, CN400, CN401 and CN402 connectors on the Main PCB.

5. Remove the 2 screws on the left and right sides of the PCB Bracket.

6. Carefully lift the Main PCB Ass’y.

7. Disconnect the CN201 on the Main PCB and LED connector CN702 on the LED PCB.

8. Remove the Power Shaft.

9. Remove the 6 screws on the top side of the Main PCB.

10. Remove the 2 screws on the Power Inlet Socket.

11. Lift the Main PCB and place it on a flat, level surface that is protected from static electricity.

CKG7507L 5-1

5 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the CKG7507L monitor.

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

these components.

5-1 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.

5-1-5 CRT Ass’y Disassembly

1. Complete all previous steps.

2. Remove the 4 side screws 2 on the top and 1 on either side of the CRT and lift the CRT Unit Bracket.

3. Unhook the Degaussing Coil Assembly and lift it off the CRT.

5-2-1 Replacing the CRT

1. Loop the CRT Ground Assembly around the back of the CRT and under the 4 corner, metal ears. Position the corner with the spring last.

2. With the Front Cover Assembly lying face down on a protective pad, position the CRT so that the corner metal ears fit properly in the Front Cover Assembly.

3. Replace the Degaussing Coil Assembly and secure the Coil with the plastic Degaussing Coil Holders.

4. Replace the Unit Bracket Ass’y.

5. Replace the 4 corner screws.

5-2-2 Replacing the Main PCB

1. Stand the monitor on its front with the screen facing downward.

2. Replace the 6 screws on the top side of the Main PCB and the 2 screws on the power Inlet Socket.

3. Replace the Power Shaft.

4. Replace connector CN201 on the Main PCB and Led connector CN702 on the LED PCB.

5. Position the Main PCB Ass’y in the Front Cabinet and secure it on both sides with the screws between the Bottom Chassis and CRT Unit Bracket.

6. Replace the DY connector at the CN301, CN400, CN401 and CN402 connectors on the Main PCB.

7. Replace all easily accessible ground wires on the Main PCB and Bottom Chassis.

4. Lift the CRT up and away from the Front Cover Assembly and place it on a padded surface.

Do not lift the CRT by the neck.

Caution: If you will be returning this CRT to

the monitor, be sure to place the CRT face down on a protective pad.

8. Replace the Degaussing Coil at CN602 on the Main PCB.

9. Replace the Anode Cap.

5-2-3 Replacing the CRT Socket PCB

1. Hold the CRT Socket PCB Ass’y while you lift the Cap on the CRT Socket and replace the two Focus wires.

2. Replace connectors CN13 and CN14 on the CRT Socket PCB.

3. Reconnect the CRT Socket on the CRT pins at the plug/Socket junction.

5-2-4 Replacing the Video PCB.

1. Position the Video Shield and replace all screws.

2. Replace both side screws on the lower edge of the Video PCB Ass’y and the screw on the signal connector.

3. Replace connectors CN102, CN105 and CN106 on the Video PCB.

5-2-5 Cabinet Reassembly

1. Complete all previous steps.

2. Position the Top Shield and replace the 12 screws.

3. Replace the 4 screws on the Bottom Cover.

4. Position the Rear Cover making sure that the tabs along the front edge are properly snapped in place. Replace the 4 screws.

5. Set the monitor on its Base and make sure that the CRT faceplate was not scratched or otherwise damaged.

5 Disassembly and Reassembly

5-2 CKG7507L

5-2 Reassembly

With the CRT facing downward on a protective pad, use the steps that follow to reassemble the monitor.

6-1-1 Before Making Adjustments

6-1-1 (a) ORIENTATION

When servicing, always face the monitor to the east.

6-1-1 (b) MAGNETIC FIELDS

Whenever possible, use magnetic field isolation equipment such as a Helmholtz field to surround the monitor. If a Helmholtz field is not available, frequently degauss the unit under test.

Caution: Other electrical equipment may cause

external magnetic fields which may interfere with monitor performance.

Use an external degaussing coil to limit magnetic build up on the monitor. If an external degaussing coil is not available, use the internal degaussing circuit. However, do not use the internal degaussing circuit more than once per 30 minutes.

6-1-1 (c) WARM-UP TIME

The monitor must be on for 30 minutes before starting alignment. Warm-up time is especially critical in color temperature and white balance adjustments.

6-1-1 (d) SIGNAL

Analog, 0.714 Vp-p positive at 75 ohm, internal termination Sync: Separate/Composite (TTL level negative/positive)

Sync-on-Green: Composite sync 0.286 Vp-p negative (Video 0.714 Vp-p positive)

6-1-1 (e) SCANNING FREQUENCY

Horizontal: 30 kHz to 70 kHz (Automatic) Vertical: 50 Hz to 160 Hz (Automatic)

Unless otherwise specified, adjust at the 1024 x 768 mode (H: 60 kHz, V: 75 Hz) signals.

Refer to Table 2-1 on page 3-3.

6-1-1 (f) HIGH VOLTAGE ADJUSTMENT

Signal: No signal Display image: Self raster Contrast: Maximum Brightness: Maximum Limit: 26 kV ± 0.5 kV

Measure the hight voltage level at the anode cap. High voltage should be within the limit as above. If the high voltage needs adjustment use the following procedure.

PROCEDURE

1. Turn the power off and disconnect the AC line cord from the power source.

2. Unsolder and remove VR501 on the Main PCB.

3. Replace VR501 and adjust the high voltage to the specification.

4. Using a soldering iron, melt the adjustment cap on VR501 to prevent any movement.

6-1-1 (g) G2 (SCREEN) VOLTAGE ADJUSTMENT

Signal: No signal Display image: Self raster Contrast: Maximum Brightness: Maximum

Adjust the Screen VR of the FBT so that the G2 (Screen) Voltage for SDD CRT is 430 V ± 10 V.

6-1-1 (h) HORIZONTAL FREE-RUN FREQUENCY ADJUSTMENT

Signal: 60 kHz/75 Hz Contrast: Maximum Brightness: Maximum

Connect the Frequency counter probe to the H-DY (Red wire). Conncet pin 26 of IC401 to the Ground. Adjust VR 402 to 58.7 kHz ± 10 Hz.

6-1-1 (I) CENTER RASTER

Adjust SW401 so that the back raster comes to the center when you apply a signal of 60 kHz/75 Hz.

CKG7507L 6-1

6 Alignment and Adjustments

This section of the service manual explains how to make permanent adjustments to the monitor. Directions are given for adjustments using the monitor Interface Board Ver. 2.0 and software (SoftJig).

6-1 Adjustment Conditions

Caution: Changes made without the SoftJig are saved only to the user mode settings. As such, the

settings are not permanently stored and may be inadvertently deleted by the user.

6-1-1 (J) BRIGHTNESS AND CONTRAST

Unless otherwise specified, adjust external VRs: Brightness: Maximum (turn knob fully clockwise)

Contrast: Maximum (turn knob fully clockwise)

6-1-2 Required Equipment

The following equipment may be necessary for adjustment procedures:

6-1-2 (a) DISPLAY CONTROL ADJUSTMENT

1. Non-metallic (–) screwdriver: 1.5 mm Non-metallic (–) screwdriver: 3 mm

2. Philips (+) screwdriver: 1.5 mm

3. Non-metallic hexkey: 2.5 mm

4. Digital Multimeter (DMM), or Digital Voltmeter (DVM)

5. Signal generator, or Computer with a video board that uses the ET-4000 chipset (strongly recommended if using Samsung DM 200 software) and that displays: 1024 x 768 @ 75 Hz, or 800 x 600 @ 75 Hz (minimum).

6. Personal computer

7. Required software: Softjig.exe from Samsung which includes the cg17e.c data file Samsung DM200, or DisplayMate for Windows from Sonera Technologies

8. Interface Board Ver. 2.0 Code No. BH81-90001K

9. Parallel communications cable (25-pin to 25-pin); Code No. BH81-90001H

10. Signal cable (15-pin to 15-pin cable with additional 3-pin connector); Code No. BH81-90001J

11. 5 V DC adapter, not supplied

Note: SoftJig Ass’y (includes items 8, 9 and 10)

Code No. BH81-90001L

6-1-2 (b) COLOR ADJUSTMENTS

1. All equipment listed in 6-1-2 (a), above

2. Color analyzer, or any luminance measurement equipment

6-1-3 Connecting the SoftJig

Connect the monitor to the signal generator and/ or PC as illustrated in Figures 6-1 and 6-2.

Refer to Softjig Manual.

Note: The signal cable connector which includes

the 3-wire cable must connect to the monitor. If you use Setup 2 (PC only, no signal generator) you can only make adjustments to the signal timing available on that computer system. To make corrections to all factory timings requires the use of an additional signal generator.

6-1-4 After Making Adjustments

After finishing all adjustments, test the monitor in all directions. If, for example, the monitor does not meet adjustment specifications when facing north, reposition the monitor to face east and readjust. This time, try for an adjustment closer to the ideal setting within the tolerance range. Test the unit again in all directions. If the monitor again fails to meet specifications in every direction, contact your Regional After Service Center for possible CRT replacement.

6 Alignment and Adjustments

6-2 CKG7507L

MONITOR

INTERFACE BOARD VER. 2.0

SIGNAL GENERATOR

3-WIRE CABLE

SIGNAL CABLE

5V DC ADAPTOR

PARALLEL CABLE

Figure 6-1. Setup 1, With Signal Generator

MONITOR

INTERFACE BOARD VER. 2.0

3-WIRE CABLE

SIGNAL CABLE

PARALLEL CABLE

D-SUB CONNECTOR

5V DC ADAPTOR

Figure 6-2. Setup 2, Without Signal Generator

6 Alignment and Adjustments

CKG7507L 6-3

6-2 Using the SoftJig

Refer to Softjig Manual.

6-3-1 Centering

Centering means to position the center point of the display in the middle of the display area. Horizontal size and position and vertical size and position control the centering of the display.

Adjust the horizontal size and vertical size to their optimal settings: 306 mm (H) x 230 mm (V).

Adjust the horizontal position and vertical position to ≤ 4.0 mm of the center point of the screen.

|A-B| ≤ 4.0 mm. |C-D| ≤ 4.0 mm.

Figure 6-3. Centering

6-3-1 (a) HORIZONTAL SIZE ADJUSTMENT CONDITIONS

Scanning frequency: 60 kHz/75 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Click on the << or >> box next to H_SIZE to adjust the horizontal size of the display pattern to 306 mm. (Tolerance: ± 3 mm.)

Caution: Must be adjusted first of all the

H_SIZE to 306 mm ± at VGA2 (31 kHz/70 Hz). Because all mode variable H_SIZE range is based on the adjusted factory data of VGA2.

6-3-1 (b) VERTICAL SIZE ADJUSTMENT CONDITIONS

Scanning frequency: 60 kHz/75 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Click on the << or >> box next to V_SIZE to adjust the vertical size of the display pattern to 230 mm. (Tolerance: ± 3 mm.)

6-3-1 (c) HORIZONTAL POSITION ADJUSTMENT CONDITIONS

Scanning frequency: 60 kHz/75 Hz Display image: Crosshatch pattern

Click on the << or >> box next to H_POSI to center the horizontal image on the raster.

6-3-1 (d) VERTICAL POSITION ADJUSTMENT CONDITIONS

Scanning frequency: 60 kHz/75 Hz Display image: Crosshatch pattern

Click on the << or >> box next to V_POSI to center the vertical image on the raster.

6-3-2 Linearity

Linearity affects the symmetry of images as they appear on the screen. Unless each row or column of blocks in a crosshatch pattern is of equal size, or within the tolerances shown in Tables 6-2 and 6-3, an image appears distorted, elongated or squashed.

Table 6-1. Standard Modes Linearity: 640x480/75Hz,

800x600/85Hz and 1024x768/85Hz

Table 6-2. Other Modes Linearity: VGA, SVGA, XGA,

MAC, etc.

6-3-2 (a) HORIZONTAL LINEARITY ADJUSTMENT

The CKG7507L/LM monitors offer only Vertical Linearity adjustments. Horizontal Linearity is fixed on the Chassis and is not adjustable.

6 Alignment and Adjustments

6-4 CKG7507L

6-3 Display Control Adjustments

DISPLAY AREA

EDGE OF BEZEL

4 : 3

5 : 4

Horizontal: 17.8~20.5 Vertical : 17.8~20.5

Horizontal: 16.7~19.2 Vertical : 17.8~20.5

Supported Timing Mode

Each block (14 %)

Difference between

adjacent blocks (5 %)

Horizontal: Less than 0.96 mm Vertical : Less than 0.96 mm

Horizontal: Less than 0.90 mm Vertical : Less than 0.96 mm

4 : 3

5 : 4

Horizontal: 18.2~20.1 Vertical : 18.2~20.1

Horizontal: 17.1~18.9 Vertical : 18.2~20.1

Standard Modes Linearity

Each block (10 %)

Difference between

adjacent blocks (4 %)

Horizontal: Less than 0.77 mm Vertical : Less than 0.77 mm

Horizontal: Less than 0.72 mm Vertical : Less than 0.77 mm

6-3-2 (b) VERTICAL LINEARITY ADJUSTMENT CONDITIONS

Scanning frequency: 60 kHz/75 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

To adjust the Vertical Linearity, refer to Tables 6-1 and 6-2 for the tolerance range.

Click on the << or >> box next to V_LIN to optimize the image.

6-3-3 Trapezoid Adjustment

CONDITIONS

Scanning frequency: 60 kHz/75 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Click on the << or >> box next to TRAPE to make the image area rectangular.

Figure 6-4. Trapezoid

6-3-4 Pinbalance Adjustment

CONDITIONS

Scanning frequency: 60 kHz/75 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Click on the << or >> box next to PIN_BAL to optimize the image.

6-3-5 Parallelogram Adjustment

CONDITIONS

Scanning Frequency: 60 kHz/75 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Click on the << or >> box next to PARALL to make the image area rectangular.

Figure 6-6. Parallelogram

6-3-6 Side Pincushion Adjustment

CONDITIONS

Scanning frequency: 60 kHz/75 Hz Display image: Crosshatch pattern

Click on the << or >> box next to BARREL to straighten the sides of the image area.

6-3-7 Tilt Adjustment

CONDITIONS

Scanning Frequency: 60 kHz/75 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Click on the << or >> box next to ROTATE to correct the tilt of the display.

6-3-8 Degauss

No adjustments are available for the degaussing circuit. The degaussing circuit can effectively function only once per 30 minutes.

6-3-9 To Delete the User Mode Data

To delete the adjustment data from the user modes, click USER DELETE.

6-3-10 Save the Data

To save the adjustment data for a mode, press FACTORY SAVE.

6 Alignment and Adjustments

CKG7507L 6-5

| A - B | < 4 mm

4 mm

| C1 |, | C2 | ≤ 2.0 mm, | D1 |, | D2 | ≤ 2.0 mm.

Figure 6-7. Pincushion

D2D1

D1 D2 D1

Figure 6-5. Pinbalance

| D1 |, |D2 | ≤ 2 mm

6-4-1 Color Coordinates (Temperature)

Color temperature is a measurement of the radiant energy transmitted by a color. For computer monitors, the color temperature refers to the radiant energy transmitted by white. Color coordinates are the X and Y coordinates on the chromaticity diagram of wavelengths for the visible spectrum.

CONDITIONS

Measurement instrument: Color analyzer Scanning frequency: 60 kHz/75 Hz Display image: White flat field at

center of display area

Luminance: Maximum

PROCEDURE

Use the directions in sections 6-4-2 through 6-4-3 to adjust the color coordinates for: 9300K to x = 0.283 ± 0.02, y = 0.298 ± 0.02 6500K to x = 0.313 ± 0.02, y = 0.329 ± 0.02

6-4-2 Color Adjustments for 9300K

6-4-2 (a) BACK RASTER COLOR ADJUSTMENT CONDITIONS

Scanning frequency: 60 kHz/75 Hz Display image: Back raster pattern Brightness: Maximum Contrast: Maximum

1. Select COLOR CHANNEL 1 to control the color for 9300K.

2. Adjust the luminance of the back raster to between 0.4 to 0.5 ft-L using the G_CUT controls.

3. Click on the << or >> box next to B_CUT to set the “y” coordinate to 0.298 ± 0.02.

4. Click on the << or >> box next to R_CUT to set the “x” coordinate to 0.283 ± 0.02.

Note: If the above adjustments cannot be

done to each coordinate, click on the << or >> box next to G_CUT to decrease or increase the green cutoff (bias) and repeat procedures 3 and 4.

6-4-2 (b) G-GAIN ADJUSTMENT

Figure 6-8. Green Box Pattern

CONDITIONS

Scanning frequency: 60 kHz/75 Hz Display image: Green box pattern Brightness: Maximum Contrast: Maximum

1. Click on the << or >> box next to G_GAIN to

adjust the brightness of the Green Gain to 38 ± 1 ft-L.

Note: If you can’t increase the Green Gain to

the appropriate value, click on the >> box next to increase the ABL point.

6-4-2 (c) WHITE BALANCE ADJUSTMENT CONDITIONS

Scanning frequency: 60 kHz/75 Hz Display image: Full white pattern Brightness: Maximum Contrast: Maximum

Figure 6-9. Full White Pattern

6 Alignment and Adjustments

6-6 CKG7507L

1/3H-1/2H

1/3V-1/2V

FRONT BEZEL OPENING BACK RASTER

GREEN WINDOW

FRONT BEZEL OPENING BACK RASTER

WHITE WINDOW

6-4 Color Adjustments

1. Click on the << or >> boxes next to R_GAIN and B_GAIN to make the video white. (For 9300K color adjustment: x = 0.283 ± 0.02, y = 0.298 ± 0.02.)

Note: Do not touch the G_GAIN controls.

2. Check the ABL. If it is not within the specifications (35 ± 1 ft-L), use the ABL controls to adjust it.

3. Select COLOR FACTORY SAVE to save the data.

6-4-2 (d) WHITE BALANCE ADJUSTMENT VERIFICATION CONDITIONS

Scanning frequency: 60 kHz/75 Hz Display image: Back raster pattern X-Y Coordinates: x = 0.283 ± 0.02,

y = 0.298 ± 0.02 ABL Luminance 35 ±1 ft-L Brightness: Maximum Contrast: Maximum

1. Check whether the color coordinates of the

back raster satisfy the above spec. If they do not, return to 6-4-2 (a) and readjust

all settings.

2. Display a full white pattern. Note: Do not touch the G_GAIN controls.

3. Adjust the Contrast Control on the monitor so

that the luminance of the video is about 5 ft-L.

4. Check whether the white coordinates of the

video meet the above coordinates spec.

5. Adjust the Contrast Control again so that the

luminance of the video is about 24 ft-L.

6. Check whether the white coordinates of the

video satisfies the above spec. If they do not, return to 6-4-2 (a) and readjust

all settings.

6-4-3 Color Adjustments for 6500K

6-4-3 (a) BACK RASTER COLOR ADJUSTMENT CONDITIONS

Scanning frequency: 60 kHz/75 Hz Display image: Back raster pattern Brightness: Maximum Contrast: Maximum

1. Select COLOR CHANNEL 2 to control the

color for 6500K.

2. Adjust the luminance of the back raster to

between 0.4 to 0.5 ft-L using the G_CUT controls.

Note: For 6500K adjustments you must not

change the Screen VR of the FBT. To do so changes the 9300K setting values.

3. Click on the << or >> boxes next to R_CUT and B_CUT to adjust the R-Bias to x = 0.313 ±

0.02 and the B-Bias to y = 0.329 ± 0.02.

6-4-3 (b) G-GAIN ADJUSTMENT

This procedure is the same as that for 9300K, refer to the procedure on page 6-8.

6-4-3 (c) WHITE BALANCE ADJUSTMENT CONDITIONS

Scanning frequency: 60 kHz/75 Hz Display image: Full white pattern Brightness: Maximum Contrast: Maximum

1. Click on the << or >> boxes next to R_GAIN and B_GAIN to make the video white. (For 6500K color adjustment: x = 0.313 ± 0.02, y = 0.329 ± 0.02.)

2. Refer to the procedure for 9300K, section 6-4-2 (c) steps 2 and 3.

6-4-3 (d) WHITE BALANCE ADJUSTMENT VERIFICATION

Refer to the procedure for 9300K, section 6-4-2 (d).

6 Alignment and Adjustments

CKG7507L 6-7

6-4-4 Luminance Uniformity Check

Luminance is considered uniform only if the ratio of lowest to highest brightness areas on the screen is not less than 7.5:10.

CONDITIONS

Scanning frequency: 60 kHz/75 Hz

(1024 x 768) Display image: White flat field Brightness: Cut off point at 24 ft-L Contrast: Maximum

PROCEDURE

Measure luminance at nine points on the display screen (see figure below).

6-4-5 Focus Adjustment

CONDITIONS

Scanning frequency: 60 kHz/75 Hz

(1024 x 768) Display image: “H” character pattern Brightness: Cut off point Contrast: Maximum

PROCEDURE

1. Adjust the Focus VR on the FBT to display the

sharpest image possible.

2. Use Locktite to seal the Focus VR in position.

6-4-6 Color Purity Adjustment

Color purity is the absence of undesired color. Conspicuous mislanding (unexpected color in a uniform field) within the display area shall not be visible at a distance of 50 cm from the CRT surface.

CONDITIONS

Orientation: Monitor facing east Scanning frequency: 60 kHz/75 Hz Display image: White flat field Luminance: Cut off point at the center

of the display area

Note: Color purity adjustments should only be

attempted by qualified personnel.

PROCEDURE

For trained and experienced service technicians only.

Use the following procedure to correct minor color purity problems:

1. Make sure the display is not affected by external magnetic fields.

2. Very carefully break the glue seal between the 2-pole purity convergence magnets (PCM), the band and the spacer (see Figures 6-11).

3. Make sure the spacing between the PCM assembly and the CRT stem is 29 mm ± 1 mm.

4. Display a green pattern over the entire display area.

5. Adjust the purity magnet rings on the PCM assembly to display a pure green pattern. (Optimum setting: x = 0.295 ± 0.015, y = 0.594 ± 0.015)

6. Repeat steps 4 and 5 using a red pattern and then again, using a blue pattern.

Table 6-3. Color Purity Tolerances

(For 9300K color adjustment: x = 0.283 ± 0.02, y = 0.298 ± 0.02)

7. When you have the PCMs properly adjusted, carefully glue them together to prevent their movement during shipping.

6 Alignment and Adjustments

6-8 CKG7507L

Red: x = 0.640 ± 0.015 y = 0.323 ± 0.015 Green: x = 0.295 ± 0.015 y = 0.594 ± 0.015 Blue: x = 0.142 ± 0.015 y = 0.066 ± 0.015

Figure 6-10. Luminance Uniformity Check Locations

Table 6-4. Misconvergence Tolerances

Figure 6-11. Magnet Configuration

Figure 6-12. Toshiba Magnet Configuration

Figure 6-13. Convergence Measurement Areas

6-5-1 Static (Center) Convergence

Static convergence involves alignment of the red, blue and green lines in the center area of the display. See “Dynamic Convergence” for alignment of the color fields around the edges of the display.

CONDITIONS

Direction: Monitor facing east Warm-up: 30 minutes Display image: Crosshatch pattern Tolerances: See Table 6-4

PROCEDURE

As shown in Figure 6-11, the CRT used in these monitors has the same magnet configuration as shown in Table 6-5 below.

Table 6-5. Magnet Order

Use the following steps to correct any static misconvergence:

1. Make sure the display is not affected by external magnetic fields.

2. Locate the pair of 4-pole magnet rings.

3. Unlock the rings and rotate the individual rings (change the spacing between tabs) to converge the vertical red and blue lines.

4. Rotate the pair of rings (maintaining the spacing between tabs) to converge the horizontal red and blue lines.

6 Alignment and Adjustments

CKG7507L 6-9

6-5 Convergence Adjustments

Misconvergence occurs when one or more of the electron beams in a multibeam CRT fail to meet the other beams at a specified point.

Position Error in mm CRT Dot Pitch Center (A) 0.30 0.28

Edge (B) 0.40 0.28

CRT

FRONT

2 3 4

6 7

Samsung SDD CRT

1 Setup Bolt 2 Bow Magnet 3 Band 4 2-Pole Magnet 5 Spacer 6 4-Pole Magnet 7 Spacer 8 6-Pole Magnet 9 Holder 10 Band 11 Tabs

CRT

FRONT

2 3 4

6 7

Toshiba CRT

1 Setup Bolt 2 Bow Magnet 3 Spacer 4 2-Pole Magnet 5 Band 6 6-Pole Magnet 7 Spacer 8 4-Pole Magnet 9 Holder 10 Band 11 Tabs

230 MM

306 MM

CRT Manufacturer Magnet Order from Front of CRT SDD Convergence bow, 2-pole,

4-pole, 6-pole

Toshiba Convergence bow, 2-pole,

6-pole, 4-pole

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