SAMSUNG PG17HS9UADC Schematics

Manual

SERVICE

COLOR 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

COLOR MONITOR

PG17H*/PG17IS PG19LS/PG19LO/PG19HS/ PG19IS/PG19S*/PG19R* PG21**

Samsung Electronics Co., Ltd. August 1999. Printed in Korea Code No.: BH68-00227A

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 unitÕs 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.

PG17**/PG19**/PG21** 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 unitÕs 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 Òanti-staticÓ 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 instrumentÕs ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrumentÕs 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 PG17**/PG19**/PG21**

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.

2 Product Specifications

2-1 Specifications

Picture Tube: 17-Inch (43 cm): 16-inch (40.6 cm) viewable, 19-Inch (48.2 cm): 18-inch (45.8 cm) viewable,

21-Inch (53 cm): 20-inch (50.8 cm) viewable, 17”/19”: 0.26 mm Dot pitch, 21”: 0.25 mm Dot pitch, Full-square flat-face tube, 90˚ Deflection, 100˚ Deflection (PG19S*, PG19R*), Anti-Reflection coating with Anti-electrastatic, Medium short persistence phosphor

Scanning Frequency Horizontal : PG17H*/PG19R*/PG19LS/PG21LS: 30 kHz to 96 kHz (Automatic), (Automatic) PG19HS/PG19S*: 30 kHz to 110 kHz (Automatic), PG21MS: 30 kHz to 115 kHz

Vertical : 50 Hz to 160 Hz (Automatic)

Display Colors Unlimited colors

Maximum Resolution Horizontal : 17”/19”/PG21LS: 1600 Dots, PG21MS: 1800 Dots

Vertical : 17”/19”/PG21LS: 1200 Lines, PG21MS: 1440 Dots

Input Video Signal Analog, 0.7 Vp-p positive at 75 Ω, internally terminated

Input Sync Signal Separate Sync : TTL level positive/negative

Composite Sync : TTL level positive/negative Sync-on-Green : Composite sync 0.3 Vp-p negative (Video on Vp-p positive)

Maximum Pixel Clock rate 17”/PG19LS/PG19R*/PG21LS : 205 MHz, PG19S*/PG19HS : 240 MHz, PG21MS : 280 MHz

Active Display 17” ; Horizontal : 306 mm ± 3 mm (12.05” ± 0.12”)

Vertical : 230 mm ± 3 mm (9.06” ± 0.12”)

19” ; Horizontal : 352 mm ± 3 mm (13.86” ± 0.12”) ; 330 mm ± 3 mm (12.99” ± 0.12”)

Vertical : 264 mm ± 3 mm (10.39” ± 0.12”)

21” ; Horizontal : 393 mm ± 3 mm (15.47” ± 0.12”)

Vertical : 294.5 mm ± 3 mm (11.60” ± 0.12”)

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

Power Consumption (max) 17”: 120 Watt , 19”: 130 Watt, 21”: 140 Watt

Dimensions Unit ; 17” : 16.3 x 16.9 x 17.2 Inches (415.0 x 430.3 x 438 mm)

(W x D x H) 19” : 18.4 x 19.6 x 19.0 Inches (468.0 x 499.0 x 483.2 mm)

21” : 19.8 x 19.4 x 20.0 Inches (504.0 x 492.0 x 508.0 mm)

Carton ; 17” : 21.1 x 22.3 x 21.9 Inches (535 x 566 x 555 mm)

19” : 22.6 x 23.2 x 22.8 Inches (573.0 x 590.0 x 580.0 mm) 21” : 25.0 x 24.6 x 25.3 Inches (634.0 x 625.0 x 642.0 mm)

Weight (Net/Gross) 17” : 39.0 lbs (17.7 kg) / 45.6 lbs (20.7 kg) (Net/Gross) 19” : 49.6 lbs (22.5 kg) / 58.8 lbs (26.7 kg)

21” : 57.6 lbs (26.1 kg) / 67.3 lbs (30.5 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 %

• PG17**/PG19**/PG21** complies with TCO 99 recommendations for reduced electromagnetic fields.

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

PG17**/PG19**/PG21** 2-1

Item Description

2 Product Specifications

2-2 PG17**/PG19**/PG21**

QRS

Video

Sync

Horizontal

Vertical

CDE

Video

Sync

Separate Sync

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

Green

Vertical

Horizontal

Sync-on-Green

800/85 Hz

800 x 600

1600/75 Hz

1600 x 1200

640/85 Hz

640 x 480

VGA3/60Hz

640 x 480

VGA2/70Hz

720 x 400

Table 2-1. 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

Separate

43.269

23.111

1.556

3.810

5.222

17.778

85.008

13.333

0.080

0.427

12.800

0.027

36.000

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

Separate

93.750

10.667

0.948

1.501

7.901

0.316

75.000

13.333

0.032

0.491

12.800

0.011

202.500

Positive

Separate

Mode

IBM VESA MAC.

Timing

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

Separate

106.250

9.412

0.837

1.325

6.972

0.279

85.000

11.765

0.028

0.433

11.294

0.009

229.50

Positive

Separate

68.681

14.560

1.280

1.440

11.520

0.320

75.062

13.322

0.044

0.568

12.667

0.044

100.000

Negative

SOG

91.146

10.971

1.016

1.422

8.127

0.406

85.024

11.761

0.033

0.483

11.235

0.011

157.500

Positive

Separate

79.976

12.504

1.067

1.837

9.481

0.119

75.025

13.329

0.038

0.475

12.804

0.013

135.000

Positive

Separate

1024/85 Hz

1024 x 768

1600/85 Hz

1600 x 1200

1152/75 Hz

1152 x 870

1280/75 Hz

1280 x 1024

1280/85 Hz

1280 x 1024

3-1-1 Before making Disassembly

1. Disconnector signal cable and power cord from the monitor.

2. With a pad beneath it, stand the monitor on its front with the screen facing downward and the base close to you.

3. Make sure nothing will damage the screen.

3-1-2 Cabinet Disassembly

1. To uncover the 2 uppermost screws. Press in the end of each screw cap and pull it away from the cabinet.

2. Remove the 4 screw on the Rear Cover and pull it toward to remove it.

3-1-3 Removing the Stand

Pull the tab outward on the Chassis Bottom and pull the Tilt and Swivel Base up to remove it.

3-1-4 Removing the Top Shield

Remove the 1 screws on the Top Shield Cover and remove the Shield.

3-1-5 Removing the Bottom Shield

1. Remove the 1 screw on the Bottom Shield Cover.

2. Lift off the Bottom Shield.

3-1-6 Removing the Video PCB Assembly

1. Remove the Video PCB from the CRT.

2. Disconnect CN102, CN103, CN12 and CN13 on the Video PCB Assembly and Video PCB AssÕy from the CRT Neck.

PG17**/PG19**/PG21** 3-1

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the PG17**/PG19**/ PG21** monitors.

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.

3-1-7 Removing the Video PCB Assembly

Rear Shield and Video PCB

1. Remove the 3 screws on the PCB Assembly.

2. Remove the Video PCB Assembly Rear Shield. (5 point)

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

3-1-8 Removing the Main PCB Assembly

1. Remove both side screws (4 screws) on the lower edge of the CRT Bracket.

2. Remove Chassis Ground Wire on the both side.

3. Disconnect CN201, CN409, CN601, H_DY, CN604 and Anode Cap on the Main PCB Assembly.

3-1-9 Removing the Main PCB

1. Remove 6 screws on the main PCB.

2. Pull the Main PCB towards you and carefully lift out the main PCB and placet it on a flat, level surface that is protected from static electricity.

3-1-10 Removing the Bracket

1. Remove the 10 screws on the Front Cabinet.

3-1-11 Removing the Degaussing Coil

1. Using pinch-nosed pliers or long-nosed pliers, carefully push the 4 plastic ties on the Bracket.

2. Lift the Degaussing Coil Assembly from the Bracket.

3 Disassembly and Reassembly

3-2 PG17**/PG19**/PG21**

3-2 Reassembly

Reassembly procedures are in the reverse order of Disassembly procedures.

4-1-1 Before Making Adjustments

4-1-1 (a) ORIENTATION

When servicing, always face the monitor to the east.

4-1-1 (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.

4-1-1 (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.

4-1-1 (d) SIGNAL

Analog, 0.7 Vp-p positive at 75 ohm, internal termination Sync: Separate/Composite (TTL level negative/positive)

Sync-on-Green: Composite sync 0.3 Vp-p negative (Video 0.7 Vp-p positive)

4-1-1 (e) SCANNING FREQUENCY

Horizontal: 30 kHz to 115 kHz (Automatic) Vertical: 50 Hz to 160 Hz (Automatic)

Unless otherwise specified, adjust at the 1024 x 768 mode (H: 68 kHz, V: 85 Hz) signals.

Refer to Table 2-1 on pages 2-2 and 2-3.

4-1-1 (f) HIGH VOLTAGE ADJUSTMENT

Signal: 1024 x 768 mode (68 kHz/85 Hz) Display image: Full white Contrast: Maximum Brightness: Maximum Limit: 27.3 kV ± 0.5 kV

(17Ó: 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 Softjig.

4-1-1 (g) G2 (SCREEN) VOLTAGE ADJUSTMENT

Signal: 1024 x 768 mode (68 kHz/85 Hz) Display image: Full white Contrast: Maximum Brightness: Maximum

Adjust the Screen VR of the FBT so that the G2 (Screen) Voltage for Toshiba it is 540 V ± 10 V.

4-1-1 (h) CENTER RASTER

Adjust VR401 so that the back raster comes to the center when you apply a signal of 91 kHz/85 Hz.

PG17**/PG19**/PG21** 4-1

4 Alignment and Adjustments

This section of the service manual explains how to make permanent adjustments to the monitor. Direction is given for adjustment using the monitor Interface Board Ver. 2.0 and software (Softjig).

4-1 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.

PG17H* SDD TOSHIBA

G2 525V 635V

PG19S* PG19R*

G2 560V 530V

MEC SDD

4-1-1 (i) BRIGHTNESS AND CONTRAST

Unless otherwise specified, adjust control volumes:

Brightness: Maximum Contrast: Maximum

4-1-2 Required Equipment

The following equipment may be necessary for adjustment procedures:

4-1-2 (a) DISPLAY CONTROL ADJUSTMENT

1. Non-metallic (Ð) screwdriver: 1.5 mm Non-metallic (Ð) 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: 1280 x 1024 @ 85 Hz, or 1600 x 1200 @ 85 Hz (maximum).

6. Personal computer

7. Required software: Softjig.exe from Samsung which includes the SF9839TE.MDL (Toshiba CRT) 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 AssÕy (includes items 8, 9 and 10)

Code No. BH81-90001L

4-1-2 (b) COLOR ADJUSTMENTS

1. All equipment listed in 4-1-2 (a), above

2. Color analyzer, or any luminance measurement equipmen

4-1-3 Connecting the SoftJig

Connect the monitor to the signal generator and/ or PC as illustrated in Figures 4-1 and 4-2.

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.

4-1-4 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.

4 Alignment and Adjustments

4-2 PG17**/PG19**/PG21**

MONITOR

INTERFACE BOARD VER. 2.0

SIGNAL GENERATOR

3-WIRE CABLE

SIGNAL CABLE

5V DC ADAPTOR

PARALLEL CABLE

Figure 4-1. 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 4-2. Setup 2, Without Signal Generator

4-2-1 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: 352 mm (H) x 264 mm (V). 1280 x 1024 mode (91 kHz/85Hz)

Adjust the horizontal position and vertical position to ² 4.0 mm of the center point of the screen.

|A-B| ² 4.0 mm. |C-D| ² 4.0 mm.

Figure 4-3. Centering

4-2-1 (a) HORIZONTAL SIZE ADJUSTMENT

CONDITIONS

Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum

Click on the << or >> box next to H_SIZE to adjust the horizontal size of the display pattern to 352 mm. (Tolerance: ± 3 mm.)

4-2-1 (b) VERTICAL SIZE ADJUSTMENT

CONDITIONS

Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum

Click on the << or >> box next to V_SIZE to adjust the vertical size of the display pattern to 264 mm. (Tolerance: ± 3 mm.)

4-2-1 (c) HORIZONTAL POSITION ADJUSTMENT

CONDITIONS

Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum

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

4-2-1 (d) VERTICAL POSITION ADJUSTMENT

CONDITIONS

Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum

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

4-2-2 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 4-1 and 4-2, an image appears distorted, elongated or squashed.

Table 4-1. Factory Preset Modes Linearity

Table 4-2. Other Modes Linearity: VGA, SVGA, XGA,

MAC, etc.

4-2-2 (a) HORIZONTAL LINEARITY ADJUSTMENT

CONDITIONS

Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum

To adjust the Horizontal Linearity, refer to Tables 4-1 and 4-2 for the tolerance range.

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

4 Alignment and Adjustments

PG17**/PG19**/PG21** 4-3

4-2 Display Control Adjustments

DISPLAY AREA

EDGE OF BEZEL

4 : 3

5 : 4

Horizontal: 20.5~23.5 Vertical : 20.5~23.5

Horizontal: 19.18~22.07 Vertical : 20.5~23.5

Supported Timing Mode

Each block (14 %)

Difference between

adjacent blocks (5 %)

Horizontal: Less than 1.10 mm Vertical : Less than 1.10 mm

Horizontal: Less than 1.03 mm Vertical : Less than 1.10 mm

4 : 3

5 : 4

Horizontal: 20.9~23.1 Vertical : 20.9~23.1

Horizontal: 19.60~21.65 Vertical : 20.9~23.1

Standard Modes Linearity

Each block (10 %)

Difference between

adjacent blocks (4 %)

Horizontal: Less than 0.88 mm Vertical : Less than 0.88 mm

Horizontal: Less than 0.82 mm Vertical : Less than 0.88 mm

4-2-2 (b) VERTICAL LINEARITY ADJUSTMENT

CONDITIONS

Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum

To adjust the Vertical Linearity, refer to Tables 4-1 and 4-2 for the tolerance range.

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

4-2-3 Trapezoid Adjustment

CONDITIONS

Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum

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

Figure 4-4. Trapezoid

4-2-4 Pinbalance Adjustment

CONDITIONS

Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum

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

4-2-5 Parallelogram Adjustment

CONDITIONS

Scanning Frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum

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

Figure 4-6. Parallelogram

4-2-6 Side Pincushion Adjustment

CONDITIONS

Scanning frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum

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

4-2-7 Tilt Adjustment

CONDITIONS

Scanning Frequency: 91 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum

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

4-2-8 Degauss

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

4-2-9 To Delete the User Mode Data

To delete the adjustment data from the user modes, Press the MENU Button for the 10 Seconds .

4-2-10 Save the Data

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

4 Alignment and Adjustments

4-4 PG17**/PG19**/PG21**

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

Figure 4-7. Pincushion

5 mm

| D1 |, | D2 | ≤ 2.0 mm

Figure 4-5. Pinbalance

D1 D2 D1

D2D1

| A - B | < 5 mm

4-3-1 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: 68 kHz/85 Hz Display Size : 352 (H) x 264 (V) Display image: White flat field at

center of display area Brightness: Cut-off Contrast: Maximum

PROCEDURE

Use the directions in sections 4-3-2 through 4-3-4 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 5000K to x = 0.346 ± 0.02, y = 0.359 ± 0.02

4-3-2 Color Adjustments for 9300K

4-3-2 (a) BACK RASTER COLOR ADJUSTMENT

CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Back raster pattern Brightness: Cut-off Contrast: Maximum

1. Select COLOR CHANNEL 1 to control the

color for 9300K.

2. Adjust the luminance of the back raster to

between 0.3 to 1ft-L using the G_CUT controls.

3. Click on the << or >> box next to B_CUT to

set the ÒyÓ coordinate to 0.298 ± 0.02.

4. Click on the << or >> box next to R_CUT to

set the ÒxÓ 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 2 and 3.

4-3-2 (b) G-GAIN ADJUSTMENT

Figure 4-8. Green Box Pattern

CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Green box pattern Brightness: Cut-off Contrast: Maximum

1. Click on the << or >> box next to G_GAIN to adjust the brightness of the Green Gain to 25 ± 1 ft-L.

Note: If you canÕt increase the Green Gain to

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

4-3-2 (c) WHITE BALANCE ADJUSTMENT

CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Full white pattern Brightness: Cut-off Contrast: Maximum

Figure 4-9. Full White Pattern

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 (30 ± 1 ft-L), use the ABL controls to adjust it.

3. Select COLOR FACTORY SAVE to save the data.

4 Alignment and Adjustments

PG17**/PG19**/PG21** 4-5

4-3 Color Adjustments

1/3H-1/2H

1/3V-1/2V

FRONT BEZEL OPENING

BACK RASTER

GREEN WINDOW

FRONT BEZEL OPENING

BACK RASTER

WHITE WINDOW

4-3-2 (d) WHITE BALANCE ADJUSTMENT VERIFICATION

CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Back raster pattern X-Y Coordinates: x = 0.283 ± 0.02,

y = 0.298 ± 0.02 Raster Luminance 0.3 ~ 1ft-L ABL Luminance 30 ± 1 ft-L Brightness: Cut-off Contrast: Maximum

1. Check whether the color coordinates of the

back raster satisfy the above spec. If they do not, return to 4-3-2 (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 20 ft-L.

6. Check whether the white coordinates of the

video satisfies the above spec. If they do not, return to 4-3-2 (a) and readjust

all settings.

4-3-3 Color Adjustments for 6500K

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

CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Back raster pattern Brightness: Cut-off Contrast: Maximum

1. Select COLOR CHANNEL 2 to control the

color for 6500K.

2. Adjust the luminance of the back raster to

between 0.3 to 1.0 ft-L using the G_CUT controls.

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.

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

This procedure is the same as that for 9300K, refer to the procedure on page 4-5.

4-3-3 (c) WHITE BALANCE ADJUSTMENT

CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Full white pattern Brightness: Cut-off 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 4-3-2 (c) steps 2 and 3.

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

Refer to the procedure for 9300K, section 4-3-2 (d).

4-3-4 Color Adjustments for 5000K

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

CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Back raster pattern Brightness: Cut-off Contrast: Maximum

1. Select COLOR CHANNEL 3 to control the color for 5000K.

2. Adjust the luminance of the back raster to between 0.3 to 1.0 ft-L using the G_CUT controls.

3. Click on the << or >> boxes next to R_CUT and B_CUT to adjust the R-Bias to x = 0.346 ±

0.02 and the B-Bias to y = 0.359 ± 0.02.

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

This procedure is the same as that for 9300K, refer to the procedure on page 4-5.

Adjust the brightness of the G_GAIN less 5 ft-L than brightness of procedure for 9300K.

4-3-4 (c) WHITE BALANCE ADJUSTMENT

CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: Full white pattern Brightness: Cut-off Contrast: Maximum

1. Click on the << or >> boxes next to R_GAIN and B_GAIN to make the video white. (For 5000K color adjustment: x = 0.346 ± 0.02, y = 0.359 ± 0.02.)

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

4 Alignment and Adjustments

4-6 PG17**/PG19**/PG21**

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

Refer to the procedure for 9300K, section 4-3-2 (d).

4-3-5 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: 68 kHz/85 Hz

(1024 x 768) Display image: White flat field Display size 352 (H) x 264 (V) Brightness: Cut off point Contrast: Maximum

PROCEDURE

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

4-3-6 Focus Adjustment

CONDITIONS

Scanning frequency: 68 kHz/85 Hz Display image: ÒHÓ 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.

4-3-7 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: 68 kHz/85 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.

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 4-3. 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.

4 Alignment and Adjustments

PG17**/PG19**/PG21** 4-7

Red: x = 0.620 ± 0.015 y = 0.334 ± 0.015

Green: x = 0.289 ± 0.015 y = 0.595 ± 0.015

Blue: x = 0.153 ± 0.015 y = 0.072 ± 0.015

Figure 4-10 Luminance Uniformity Check Locations

Memo

4 Alignment and Adjustments

4-8 PG17**/PG19**/PG21**

PG17**/PG19**/PG21** 5-1

5 Troubleshooting

5-1 Parts Level Troubleshooting

Notes: 1. If a picture does not appear, fully rotate the brightness and contrast controls clockwise and reinspect.

2. Check the following circuits.

• No raster appears: Power circuit, Horizontal output circuit, H/V control circuit, and H/V output circuit.

• High voltage develops but no raster appears: Video output circuits.

• High voltage does not develop: Horizontal output circuits.

5-1-1 No Power Supply

Check and replace FG601, D601,

IC661, IC662.

Done.

Repeating start?

Check and replace D601, D604, D663,

Q632, and Q664.

Yes

IC601 Pin 1 waveform is right?

Check and replace IC601,

IC602, IC604.

Yes

IC602 and IC604

are right?

Replace parts and verify voltages.

Yes

Normal operation

Replace Main board.

Yes

WAVEFORMS

544 V (IC601, #1)

CH1 P-P = 544 V CH1 RMS = 332.4 V

Verify voltages.

5 Troubleshooting

5-2 PG17**/PG19**/PG21**

5-1-2 DPMS Failure

Check signal source

H/V sync video level.

Make No H/V sync (power off mode)

LED blinks

Check IC201 Pin 39.

Yes

+12 V line off

Check IC201 Pin 9.

Yes

Q632 Base driving voltage exists?

Check IC201 Pin 10.

Check and replace Q632.

Yes

Done

5 Troubleshooting

PG17**/PG19**/PG21** 5-3

5-1-3 H_Deflection Failure

IC402 Pin 6 waveform is right?

Q403 source waveform

is right?

Check D407, D408, Q403, R436

and R438, +210 V line.

Yes

1. Check R401, +12 V line.

2. Check IC402 Pins 6~5, 7~6.

3. Replace IC402.

Q404 gate, drain

waveforms are right?

Check Q404, R415.

Check +25 V line.

Yes

Q405 base, collector

waveforms are right?

Check and replace D410 and Q405.

Check DY connector connection.

Yes

IC261 Pin 4 is high?

Replace IC261.

Check some parts around

Q261 and Q262.

Yes

IC261 Pin 26 waveform

is right?

Check some parts around IC261.

Yes

WAVEFORMS

230 V (Q405, Source)

CH1 P-P = 230 V CH1 RMS = 150.1 V

12.08 V (IC261, #26)

CH1 P-P = 12.08 V CH1 RMS = 7.396 V

10.96 V (IC402, #6)

CH1 P-P = 10.96 V CH1 RMS = 6.180 V

54 V (Q404, Drain)

CH1 P-P = 54 V CH1 RMS = 22.44 V

11.6 V (Q404, Gate)

CH1 P-P = 11.6 V CH1 RMS = 6.944 V

18.6 V (Q405, Base)

CH1 P-P = 55.2 V CH1 RMS = 9.52 V

1.216 kV (Q405, Collector)

CH1 P-P = 1.216 kV CH1 RMS = 316 V

Check some parts around Q263.

5 Troubleshooting

5-4 PG17**/PG19**/PG21**

5-1-4 S Correction Failure

S1~S5 signals are right at each

frequency block?

Check S1 ~ S5 signal.

Check and replace

C430, C431, C433, C434, C435,

C437 C441, C453, C454, C455, C456, C457,

Q409~Q413, Q451~Q455, Q456~Q460 .

Yes

5-1-5 H_Lin. Failure

IC201 Pin 21 voltage varies with

different H_Lin. DAC values?

IC403 Pin 7, 8 voltage varies with

different H_Lin. DAC values?

Check +12 V line.

Check some parts around IC403.

Check L403.

Yes

Check and replace IC201.

Replace IC201.

5-1-6 Invariable H_Size

IC261 Pin 28 voltage varies with

different H_Size DAC values?

IC401 Pin 6 output duty varies with

different H_Size DAC values?

Check some parts around IC261 Pin

28, IC401.

Yes

Check and replace IC261.

5 Troubleshooting

PG17**/PG19**/PG21** 5-5

5-1-7 Abnormal H_Size

T402 Pin 8 waveform is right?

Check and replace T402.

Check some parts around D415, IC261

Pin 28, IC402 Pin 2 and IC201 Pin20.

Yes

5-1-8 Side Pin or Trap Failure

IC261 Pin 24 output exists?

Yes

Check and replace IC261.

Check and replace IC402.

Check some parts IC402 Pin 2

and IC261 Pin 24.

5-1-9 Para. or Pin Balance Failure

IC261 Pin 24 output varies with

different DAC values?

Replace IC261.

WAVEFORMS

29.8 V (T402, #8)

CH1 P-P = 29.8 V CH1 RMS = 7.14 V

5 Troubleshooting

5-6 PG17**/PG19**/PG21**

5-1-10 Tilt Failure

IC201 Pin 23 output duty varies

with different DAC values?

IC403 Pin 10, 11 output varies with

different DAC values?

Check and replace IC403.

Check and replace CRT.

Yes

Check and replace IC201.

Check tilt connector connection

5-1-11 V Deflection Failure

±14 V line is on?

IC261 Pin 23 output exists?

Check and replace IC261.

Yes

Refer to 5-1-1 No Power Supply

IC301 Pin 1 input exists?

Check R276 and R304.

Yes

IC301 Pin 6 output exists?

Check and replace some parts

around IC301.

Yes

Check V DY connector connection.

5 Troubleshooting

PG17**/PG19**/PG21** 5-7

5-1-12 V Size or Pos. Variation Failure

IC261 Pin 23 output varies with

different DAC values?

Yes

Check some parts around IC301.

Check bias voltage.

Check and replace IC261 and IC301.

5-1-13 High Voltage Failure

Q524 gate driving pulse exist?

Check +12 V line.

Check and replace Q521, Q522, Q523,

Q524 and IC501.

Yes

Done

5 Troubleshooting

5-8 PG17**/PG19**/PG21**

IC101 (17”: IC104, Pin12) Pin 15

input exists and

varies with different patterns?

Check and replace IC101

(17”:IC104)

Input full white pattern to monitor.

Yes

T501 Pin 8 output exists?

Check and replace T501.

Yes

IC103 (17”: IC04) Pin 16 output

exists and varies with different

patterns?

Check and replace IC103 (17”: IC04).

Yes

Check and replace Q101,

Q102 and +12 V line.

Check CN102.

5-1-14 ABL Failure

5-1-15 Dynamic Focus Failure

IC261 Pins 18 and 15 output

are right?

Check and replace IC261.

Yes

Some parts around Q551,

Q552, Q553 and Q554 are right?

Replace failed part.

Yes

Some parts around T502 are right?

Replace failed part.

Check the connection between FBT

Pin 13, CRT Socket PCB.

Yes

2.20 V (IC251, #15)

CH1 P-P = 2.20 V CH1 RMS = 2.776 V

580 V (T551, #1)

CH1 P-P = 580 V CH1 RMS = 278.2 V

WAVEFORMS

5 Troubleshooting

PG17**/PG19**/PG21** 5-9

5-1-16 No Video

IC101 Pins 2, 6 and 11 (17”: IC104,

Pin 5, 8, 10) inputs are right?

IC101 Pins 29, 32 and 35

(17”: IC104, Pin 25, 28, 30) outputs

are right?

Check I2C bus and +12 V line.

Yes

Check CN101 and BNC B’D IC1.

IC102 Pins 4, 6 and 14 (17”: IC105,

Pin 1, 3, 5) outputs are right?

Check +12 V line.

Check and replace IC102 (17”: IC105).

Yes

Cathode DC levels are right?

Check +80 V line.

Check and replace IC101 and IC104

(17”: IC104).

Yes

G2 voltage is right?

Check G2 wire, CRT Socket board,

and FBT.

Change CRT.

Yes

Done.

Check signal cable and connection.

5 Troubleshooting

5-10 PG17**/PG19**/PG21**

5-1-17 Micom Failure

IC201 Pin 11 input is right?

IC201 Pins 13 and 14 inputs

are right?

Check X201, C204 and C205.

Yes

Check IC606.

IC201 Pin 18 input is right?

Check IC202.

Yes

All in/output values are right?

Replace IC201.

Yes

Done

3.42 V (IC201, #33)

CH1 P-P = 3.42 V CH1 RMS = 2.500 V

3.16 V (IC201, #32)

CH1 P-P = 3.16 V CH1 RMS = 2.560 V

WAVEFORMS

5 Troubleshooting

PG17**/PG19**/PG21** 5-11

5-1-18 OSD Failure

IC103 (17”: IC04) Pin 17 input is

right?

IC103 (17”: IC04) Pin 6 input is

right?

Check and replace Q104 (17”: Q103) .

Yes

Check and replace D302 and Q301.

IC103 (17”: IC04) Pins 7 and 8

inputs are right?

Check IC201 Pins 41 and 42.

Yes

IC103 (17”: IC04) Pins 20, 21 and

22 outputs are right?

Check and replace IC103 (17”: IC04) .

Yes

IC101 (17”: IC104) Pins 4, 9 and 13

inputs are right?

Check and replace QB51,

QG51 and QR51.

Check and replace IC101 (17”: IC104) .

Yes

Done

Check CN102 and connector Ass’y.

(17” only)

5 Troubleshooting

5-12 PG17**/PG19**/PG21**

RL601 operation is right?

Q630 base input is right?

Check and replace Q630.

Yes

Check D-Coil, TH601.

Yes

IC201 Pin 40 output is right?

Check and replace IC201.

Check user function key.

Yes

R217 and R630 are right?

Replace R217 and R630.

Done

Yes

Check degaussing connector.

5-1-20 Degaussing Failure

5-1-19 User Control Failure

IC201 Pins 35 and 36 inputs are

right at each function.

Check and replace function key.

Check and replace IC201.

Done

Yes

Check connector Ass’y.

5 Troubleshooting

PG17**/PG19**/PG21** 5-13

5-2 General Troubleshooting

5-2-1 No Picture

LED blinks?

LED is green color?

After restart monitor LED don’t

come on, repair power circuit.

Check signal cable.

Check G2 voltage, high voltage,

R, G, B cathode voltage.

Yes

LED is Amber color?

Yes

5-2-2 Shut down

Yes

5-2-2 Shut Down

Blinking LED’s?

Scan failure

Check horizontal, vertical deflection

system and check power supply

secondary voltages.

Yes

Check power supply.

High voltage failure?

Check high voltage system.

Check and replace IC201.

Done

Yes

Video failure?

Check Video board.

Yes

5 Troubleshooting

5-14 PG17**/PG19**/PG21**

5-2-3 Missing Color

Are proper Video levels

on CN101 (D-Sub) Pins 1, 2 and 3,

R-BNC, G-BNC and B-BNC.

Are proper AC voltage on all

cathodes?

Refer to 5-1-16 No Video.

Yes

Check signal generator and cathode.

Are proper DC voltage on all

cathodes?

Check IC104 (17”: IC104 Pins 19, 20,

and 21) Pins 10, 11 and 12.

Check QB02, QB03, QG02, QG03

QR02 and QR03.

Change the CRT.

Done

Yes

Is G2 voltage right?

Check G2 wire, G2 control, volume

and FBT.

Yes

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