Samsung 757MB, 957MB Service manual

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

CA17I*(757MB) CA19I*(957MB)

CONFIDENTIAL

CA17I*

CA19I*

Samsung Electronics Co.,Ltd.

416, Maetan-3Dong, Paldal-Gu, Suwon City, Kyungki-Do, Korea. Printed in Korea P/N : BH82-00002A-00 http://www.samsungmonitor.com (SyncMaster Worldwide) http://www.samsung-monitor.com (SyncMaster USA) http://www.sec.co.kr/monitor (Korea)

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 and CRT :

WARNING: A high voltage VR replaced in the wrong

direction may cause excessive X-ray emissions.

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. 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.

3. 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.

4. 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.

5. 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.

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

7. 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

1-1-3 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.

1. Servicing precautions are printed on the cabinet,

CA17I*/CA19I* 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

CONFIDENTIAL

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 CA17I*/CA19I*

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 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.

CONFIDENTIAL

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

17”/19”: 0.26 mm Dot pitch, Full-square tube / Perfect Flatmess, 90˚ Deflection, Anti-Reflection coating with Anti-electrastatic, Medium short persistence phosphor

Scanning Frequency Horizontal : 30 kHz ~ 96 kHz (Automatic) (Automatic) Vertical : 50 Hz ~ 160 Hz (Automatic)

Display Colors Unlimited colors Maximum Resolution Horizontal : 1600 Pixels, Vertical : 1200 Pixels 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 Coptional : Composite sync 0.3 Vp-p negative (Video on Vp-p positive) Maximum Pixel Clock rate 250 MHz Active Display 17” : Horizontal : 312 mm, Vertical : 234 mm / 19” : Horizontal : 352mm, Vertical : 264 mm Input Voltage AC 90 ~ 264 Volts, 60/ 50 Hz ± 3 Hz Power Consumption (nominal) 17”: 90 Watt , 19”: 110 Watt Dimensions (W x D x H)

Unit / Carton CA17I* : 15.7 x 16.2 x 16.2 Inches (398 x 412 x 412 mm) / 19.3 x 22.5 x 18.0 Inches (490 x 570 x 458 mm)

CA19I* : 17.3 x 18.1 x 18.1 Inches (440 x 460 x 461 mm) / 22.1 x 25.0 x 22.1 Inches (560 x 635 x 540 mm) Weight (Net/Gross) CA17I* : 17.0 kg (37.5 lbs) / 19.5 kg (43.0 lbs)

CA19I* : 21.0 kg (46.3 lbs) / 23.5 kg (51.8 lbs) Environmental Considerations Operating Temperature : 32°F ~ 104°F (0°C ~ 40°C)

Humidity : 10 % ~ 80 %

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

Humidity : 5 % ~ 95 %

• CA17I*/CA19I* complies with TCO 99 recommendations for reduced electromagnetic fields.

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

2 Product Specifications

2-1 Specifications

CA17I*/CA19I* 2-1

Item

Description

CONFIDENTIAL

2 Product Specifications

2-2 CA17I*/CA19I*

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

1280/85 Hz

1280 x 1024

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 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 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

91.146

10.971

0.016

1.422

8.127

0.406

85.024

11.761

0.033

0.483

11.235

0.011

157.500

Positive Positive

Separate

1600/75 Hz

1600 x 1200

(19” Only)

106.250

9.412

0.837

1.325

6.972

0.279

85.000

11.765

0.028

0.433

11.294

0.009

229.500

Positive Positive

Separate

Mode

IBM VESA

Timing

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

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 Positive

Separate

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

1024/75 Hz 1024 x 768

(17” Only)

1024/85 Hz 1024 x 768

1280/75 Hz

1280 x 1024

3-1-1 Before making Disassembly

1. Disconnect or 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.

3-1-2 Cabinet Disassembly

1. Remove the Stand from the monitor. (Refer to Stand manual)

2. Remove 2 screws on the Rear cover.

3. Incline the monitor by lifting the rear of the monitor.

4. Push the Opening jig each groove along the Side of the monitor till it makes a “ttak” sound. (2 grooves : Left and Right, Make sure each snap is disengaged.)

5. Pull the Rear Cover up off the monitor.

CA17I*/CA19I* 3-1

CONFIDENTIAL

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the CA17I*/CA19I* monitor.

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

handling these components.

3-1 Disassembly

Cautions: 1. Disconnect the monitor from the power source before disassembly.

2. To remove the Rear Cover, you must use the special opening jig tool.

Figure 1

Figure 2

Figure 3

Figure 4

6. Remove the Shield.(TCO 99)

7. Using pinch-nose pliers or ling-nose pliers, acrefully disconnect the Anode Cap from the CRT.

Warning: Do not touch the Anode contact

on the CRT (High Voltage may remain).

3-1-3 Removing the CRT Socket PCB

1. Complete all previous steps.

2. Lift up the Video Spring and remove the CRT Socket PCB from the CRT.

3. Disconnect all connectors on the CRT Socket PCB.

4. Using a solder iron, disconnect 5points Ground (GND) on the back of the Video Shield and remove the Shield Cap.

5. Remove the screw on the front of the Shield Socket.

6. Place the Video PCB on a flat, level surface that is protected from static electricity.

3-1-4 Removing the Main PCB

1. Complete all previous steps.

2. Disconnect the Degaussing Coil at CN601 on the Main PCB.

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

4. Disconnect the DY connector at the CN401 connector on the Main .

5. Using the jig, release the snaps (2) connecting the Front Cover and the PCB then lift up the Bottom to separate the two Shield.

6. Disconnect the Tilt connector at the CN409 connector on the Main PCB.

7. Disconnect the Sub PCB connector at the CN204 connector on the Main PCB.

8. Remove the screws on the back and along each side of the Bottom Chassis.

9. Carefully lift the Main PCB Ass’y and remove the remaining ground wires.

10. Place the Main PCB Ass’y on a flat, level surface that is protected from static electricity.

3-1-5 CRT Ass’y Disassembly

1. Complete all previous steps.

2. Straighten the Degaussing Coil Assembly coated metal ties and lift the Coil Ass’y from the CRT.

3. Remove the four corner screws and lift the CRT up and away from the Front Cover Assembly and place it on a padded surface.

Caution: Do not lift the CRT by the neck.

If you will be returning this CRT to the monitor, be sure to place the CRT face downward on a protective pad.

3 Disassembly and Reassembly

3-2 CA17I*/CA19I*

CONFIDENTIAL

3-2 Reassembly

Reassembly procedures are in the reverse order of Disassembly procedures.

Figure 6

Figure 7

Figure 5

4-1-1 Before Making Adjustments

4-1-1 (a) ORIENTATION

When servicing, always face the monitor to the east.

4-1-1 (b) 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 (c) 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 (d) SCANNING FREQUENCY

Horizontal: 30 kHz to 96 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 (e) HIGH VOLTAGE

Signal: 1024 x 768 mode (68 kHz/85 Hz) Display image: Full white Contrast: Maximum Brightness: Maximum Limit: 26 kV ± 0.5 kV (17”)

27 kV ± 0.5 kV (19”)

Measure the hight voltage level at the anode cap.

4-1-1 (f) G2 (SCREEN) VOLTAGE

The Screen Voltage is fixed in the firm so don’t need to adjust the Screen voltage.

4-1-1 (g) CENTER RASTER

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

4-1-2 Required Equipment

The following equipment may be necessary for adjustment procedures:

4-1-2 (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: 1280 x 1024 @ 85 Hz

6. Personal computer

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 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.

CA17I*/CA19I* 4-1

4 Alignment and Adjustments

This section of the service manual explains how to make permanent adjustments to the monitor.

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.

CONFIDENTIAL

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: 312 mm (H) x 234 mm (V). 1024 x 768 mode (68 kHz/85Hz)

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 4-3. Centering

4-2-1 (a) HORIZONTAL SIZE ADJUSTMENT CONDITIONS

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

Click on the << or >> box next to SIZE B+ to adjust the horizontal size of the display pattern to 312 mm (Tolerance: ± 3 mm) as the “H_SIZE” is “60” on the OSD.

4-2-1 (b) VERTICAL SIZE ADJUSTMENT CONDITIONS

Scanning frequency: 68 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 234 mm. (Tolerance: ± 3 mm.)

4-2-1 (c) HORIZONTAL POSITION ADJUSTMENT CONDITIONS

Scanning frequency: 68 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: 68 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 Table 4-1 an image appears distorted, elongated or squashed.

Horizontal Linearity = 2x x100

Vertical Linearity = 2x x100

Table 4-1

❈ Preset Mode : 68KHz / 85Hz

Pre-load Mode : Refer to Timing Chart

4-2-2 (a) HORIZONTAL LINEARITY ADJUSTMENT CONDITIONS

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

To adjust the Horizontal Linearity, refer to Table 4-1 for the tolerance range.

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

Table 4-2

(Horizontal x Vertical Size Table)

4 Alignment and Adjustments

4-2 CA17I*/CA19I*

CONFIDENTIAL

4-2 Display Control Adjustments

DISPLAY AREA

EDGE OF BEZEL

Preset mode

≤ 4% ≤8%

Adjacent Linearity

Entire Linearity

Pre-load mode (48kHz~) ≤ 5% ≤ 10% Pre-load mode (under 48kHz) ≤ 5% ≤ 14%

X max-X min

X max+X min Y max-Y min Y max+Y min

17” 19”

Horizantal

312 352

234 264

Vertical

4-2-2 (b) VERTICAL LINEARITY ADJUSTMENT CONDITIONS

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

To adjust the Vertical Linearity, refer to Table 4-1 for the tolerance range.

Use control bar after selecting “V_LINEARITY BAL” in left menu to optimize the image.

4-2-3 Trapezoid Adjustment

CONDITIONS

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

Use control bar after selecting “TRAPEZOID” in left menu to make the image area rectangular.

Figure 4-4. Trapezoid

4-2-4 Pinbalance Adjustment

CONDITIONS

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

Use control bar after selecting “PINBALANCE” in left menu to optimize the image.

4-2-5 Parallelogram Adjustment

CONDITIONS

Scanning Frequency: 68 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum

Use control bar after selecting “PARALLEL” in left menu to make the image area rectangular.

Figure 4-6. Parallelogram

4-2-6 Side Pincushion Adjustment

CONDITIONS

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

Use control bar after selecting “PINCUSHION” in left menu to straighten the sides of the image area.

4-2-7 Degauss

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

4-2-8 Save the Data

To save the adjustment data for factory frequencys, press FACTORY SAVE.

4-2-9 To Delete the User Mode Data

To delete the adjustment data from the user modes, click “@4: USER DELETE” in right menu.

4 Alignment and Adjustments

CA17I*/CA19I* 4-3

CONFIDENTIAL

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

Figure 4-7. Pincushion

4 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 : 312 (H) x 234 (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 ± 0.015, y = 0.298 ± 0.015 5000K to x = 0.346 ± 0.02, y = 0.359 ± 0.02 sRGB to x = 0.312 ± 0.02, y = 0.329 ± 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 0.5 to 0.7ft-L using the “GREEN CUTOFF” controls.

3. Use control bar after selecting “BLUE

CUTOFF” in left menu to set the “y” coordinate to 0.298 ± 0.015

4. Use control bar after selecting “RED

CUTOFF” in left menu to 0.283 ± 0.015

* If color values would not be matched desirable

values, repeat sequence 3 and 4 after readjusting

“GREEN CUTOFF” control a little different.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 40 ± 1 ft-L.

2. Click on the << or >> box next to “BM Contrast” to adjust the Brightness of the High Light Gain to 88 ft-L when the High Light function was (“BM contrast” Menu is in the “Extra Menu”) activated.

3. Select COLOR FACTORY SAVE to save the data.

4. Select BM OFF in right menu.

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 ± 0.015, y = 0.298 ± 0.015)

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

4-4 CA17I*/CA19I*

CONFIDENTIAL

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

Luminance Table (9300K) 4-3

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 5000K

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 5000K.

2. Adjust the luminance of the back raster to

between 0.5 to 0.7 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

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

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

You must adjust the Brightness of Green gain to 38 ± 1ft-L.

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 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.

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

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

Luminance Table (5000K) 4-4

4-3-4 Color Adjustments for sRGB

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 sRGB.

2. Adjust the luminance of the back raster to between 0.5 to 0.7 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 = 0.312 ±

0.02 and the B-Bias to y = 0.329 ± 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.

You must adjust the Brightness of Green gain to 24 ± 1 ft-L

4-3-4 (c) WHITE BALANCE ADJUSTMENT

4 Alignment and Adjustments

CA17I*/CA19I* 4-5

CONFIDENTIAL

40 ft-L 40 ft-LWithout ABL

Without ABL

31 ft-L 30 ft-L 88 ft-L 88 ft-L

Without ABL (High Light is Activated)

17” 19”

Without ABL

38 ft-L 35 ft-L 30 ft-L 30 ft-L

With ABL

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 sRGB color adjustment: x = 0.312 ± 0.02, y = 0.329 ± 0.02.)

2. Select COLOR FACTORY SAVE to save the data.

Luminance Table 4-5

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 312 (H) x 234 (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: “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.

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 4-6. 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

4-6 CA17I*/CA19I*

CONFIDENTIAL

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

17”/19”

Without ABL

24ft-L

CONFIDENTIAL

CA17I*/CA19I* 5-1

5 Troubleshooting

5-1 Parts Level Troubleshooting

Notes: 1. If a picture does not appear, Click the Brightness and Contrast button on the front panel, and then increase the value

of Brightness and Contrast.

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,

D701, Q701, IC601 and ZD601.

Done.

IC601 Pin 1 waveform is right?

Check and replace

IC601, ZD601, D606, IC701.

Check and Micom. (IC201)

•

Check and replace IC651.

•

Check every IC connected to 12V.

Yes

Check the Voltage at

C607 plus polarity point.

Is the Voltage 400VDC?

with PFC : 400VDC

without PFC : it is different

according to input voltage

Check and replace

FG601, D601, D703.

Yes

The secondary voltage of

T601 is right?

(Is it same the schemetic diagram)

Check TR, IC and biode

related to every B+line.

Yes

•

Check IC651 (KA78R12) Pin 12?

•

Is the voltage 12VDC?

Appear 4VDC Pin 4 of IC651?

Yes

WAVEFORMS

368 V (IC601, #1)

CONFIDENTIAL

5 Troubleshooting

5-2 CA17I*/CA19I*

5-1-2 PFC Failure

Check the Voltage at IC701 Pin5.

The Voltage is around 10VDC?

Check and Replace D702,

R711, ZD705, ZD706.

Yes

Q701 Gate waveform is right?

Replace IC701.

Yes

Check the Voltage at D701 cathode.

The Voltage is about 400VDC?

Replace Q701, D701.

Yes

Done.

5-1-3 DPMS Failure

Check signal source

H/V sync. video signal.

Make No H/V sync.

( That is power off mode).

LED blinks?

Does +12V Line off?

(Check the IC651 output Pin 2)

Check IC201 Pin 25

or replace IC201.

Yes

Does +14V_V Line off?

(Check the Q670 Collector)

Check Q671, D670.

Yes

Does the Q620 activate?

Check IC201 Pin 23

or replace IC201.

Yes

Done.

CONFIDENTIAL

5 Troubleshooting

CA17I*/CA19I* 5-3

5-1-4 H_Deflection Failure

IC402 Pin 6 waveform is right?

1. Appear the Voltage 12VDCat IC402 Pin 7 replace R451.

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

3. Replace IC402.

Yes

Q454 drain

waveform is right?

Check Q451, Q452, Q453,

ZD450, R467, D456.

Yes

Q401 gate, drain

waveforms are right?

Check Q250, Q251, IC250

Check +19V line.

Yes

Q402 base, collector

waveforms are right?

Check and replace D402 and Q402.

Check DY connector connection.

WAVEFORMS

IC402, #6

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

Q454, Drain

Q401, Gate

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

Q401, Drain

Q402, Base

Q402, Collector

CONFIDENTIAL

5 Troubleshooting

5-4 CA17I*/CA19I*

5-1-5 S Correction Failure

S1~S5 signals are right at

each frequency block?

Check S1 ~ S5 signal.

Refer to the S-corrction table page?

Check and replace

C411, C413, C414, C415, C416,

C417, C418, Q403 ~ Q407, Q408 ~ Q412

Yes

5-1-6 H_Lin. Failure

IC201 Pin 3 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

IC402 Pin 6 output duty varies with

different H_Size DAC values?

Check some parts

around IC250, IC201.

Yes

Check and replace IC201.

Replace IC201.

5-1-7 Invariable H_Size

D250 Cothode voltage varies with

different H_Size DAC values?

Check and replace IC250, IC201.

CONFIDENTIAL

5 Troubleshooting

CA17I*/CA19I* 5-5

5-1-8 Abnormal H_Size

The Voltage waveforms at

Q402 Collector are right?

Repeat the troubleshooting

Guide of H_deflection failure.

Check some parts around

IC250 and IC402 Pin 1 and 2.

Yes

5-1-9 Side Pin or Trap Failure

IC250 Pin 24 output exists?

The waveform is right?

Check and replace IC250.

5-1-10 Para. or Pin Balance Failure

IC250 Pin 24 output varies with

different DAC values?

Replace IC261.

T402 pin 8 wareform is right?

Replace T402.

Yes

Check and replace IC402.

Check some parts IC402 Pin 2

and IC250 Pin 24.

Yes

WAVEFORMS

T402, #8

WAVEFORMS

IC250, #24

Q402, Collector

CONFIDENTIAL

5 Troubleshooting

5-6 CA17I*/CA19I*

5-1-11 Tilt Failure

IC201 Pin 5 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

5-1-12 V Deflection Failure

Is 14V at IC301 Pin 2?

Is -14V at IS301 Pin 5?

IC250 Pin 23 output exists?

The waveform is right?

Check and replace IC250.

Yes

Check and replace R312, R316.

Refer to 5-1-1 No Power supply.

IC301 Pin 6 output exists?

The waveform is right?

Check and replace some

parts around IC301.

Yes

Check V DY connector connection.

WAVEFORMS

IC250, #23

IC301, #6

CONFIDENTIAL

5 Troubleshooting

CA17I*/CA19I* 5-7

5-1-13 V Size or Pos. Variation Failure

IC250 Pin 23 output varies with

different DAC values?

Yes

Check some parts around IC250.

Check bias voltage.

Check and replace IC250 and IC301.

5-1-14 High Voltage Failure

Q504 gate driving pulse exist?

The waveform is right?

Check +12 V line.

Check and replace

Q502, Q503, R511, IC501.

Yes

Done.

Are there some voltages

(350V, 30V, -210V, etc)

at secondary part of FBT?

Check and replace Q504, D508,

D509, D530, D507, D505.

Yes

WAVEFORMS

Q504, Gate

CONFIDENTIAL

5 Troubleshooting

5-8 CA17I*/CA19I*

IC102 Pin12 input exists and

varies with different patterns?

Check and replace IC102

(19”:IC101)

Input full white pattern to monitor.

Yes

T501 Pin 8 Voltage exists?

Check and replace T501.

Yes

IC103 Pin 16 output exists and varies with different patterns?

Check and replace IC103.

Yes

Check and replace IC102 and CRT

Check CN102, Q101, Q102, ZD101.

5-1-15 ABL Failure

5-1-16 Focus Failure

IC250 Pin 11 and 32

output are right?

Check and replace IC261.

Yes

Some parts around Q551,

Q552, Q553 and Q540 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

Does the voltage of Q541

collector change as the FH function

is changed on the OSD menu?

Check Q541 and others components.

Yes

WAVEFORMS

2.20 V (IC250, #11, 32)

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

580 V (T502, #1)

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

CONFIDENTIAL

5 Troubleshooting

CA17I*/CA19I* 5-9

5-1-17 No Video

IC101 Pins 2, 4 and 6

inputs are right?

IC101 Pins 20, 22 and 24

outputs are right?

Check Vcc on IC101

and replace IC101.

Yes

Check CN101, IC1, QR51, QG51,

QB51, and IC3 on BNC Board.

IC102 Pins 25, 28 and 30

outputs are right?

Check +12 V line.

Check and replace IC102.

Yes

Are there waveforms at CRT

Socket Pin Red, Green, Blue?

Check +80 V line.

Check and replace IC105 and

components around IC105.

Yes

G2 voltage is right?

Heater Voltage is right?

Check D598, D599 and G2 wire.

Check CN102 wire Assy.

Change CRT.

Yes

Done.

Check signal cable and connection.

WAVEFORMS

CRT Socket, Red, Green, Blue

CONFIDENTIAL

5 Troubleshooting

5-10 CA17I*/CA19I*

5-1-18 Micom Failure

IC201 Pin 13 input is over 4.2V?

IC201 Pin 32 and 33

inputs are right?

Check X201, C203 and C204.

Yes

Check IC650.

IC201 Pin 40 input is High Active?

Check and replace IC202.

Yes

All in/output values are right?

Replace IC201.

Yes

Done.

16 17

WAVEFORMS

3.42 V (IC201, #33)

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

3.16 V (IC201, #32)

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

CONFIDENTIAL

5 Troubleshooting

CA17I*/CA19I* 5-11

5-1-19 OSD Failure

IC103 Pin 6 and 17

waveforms are right?

Is there 5V on IC103 Pin 5 and 24?

IC102 Pins 1, 2 and 3, 4 (19”: IC101

Pins 1, 4 and 9, 13) input is right?

Check and replace IC103.

Yes

Check and replace

Q104, IC201 Pin 20.

Check 5V Line.

Does the Voltage Change on

IC201 Pins 11, 12 When you

push the control Button?

Check CN204 and Assy.

Yes

Check IC201.

Done.

Check CN102 and connector Ass’y.

18 19

WAVEFORMS

IC103, #6, 17

IC103, #5, 24

CONFIDENTIAL

5 Troubleshooting

5-12 CA17I*/CA19I*

RL601 operation is right?

Q601 base input is right?

Check and replace Q601.

Yes

Check D-Coil, POS601.

Yes

IC201 Pin 31 output is right?

Check and replace IC201.

Check user function key.

Done.

Check degaussing connector.

5-1-21 Degaussing Failure

5-1-20 User Control Failure

IC201 Pins 11 and 12 inputs are

right at each function?

Check and replace function key.

Check and replace IC201.

Done.

Yes

Check connector Ass’y.

+ 60 hidden pages