Samsung 955MB Service Manual

COLOR MONITOR

Chassis Model
CA19JS 955MB

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

CONFIDENTIAL

Samsung Electronics Co.,Ltd.

416, Maetan-3Dong, Paldal-Gu, Suwon City, Kyungki-Do, Korea.
Printed in Korea 442-742
P/N : BH82-00012A-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 :

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 excess 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 (not 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.

CA19JS 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

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 CA19JS

CONFIDENTIAL

1-3 Electrostatically Sensitive Devices (ESD) Precautions

Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly
called Electrostatically Sensitive Devices (ESD). Examples of typical ESD are integrated circuits and some field-effect
transistors. The following techniques will reduce the incidence of component damage caused by static electricity.

1-2 Servicing Precautions

WARNING 1: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.
WARNING 2:A high voltage adjusted to the wrong value may cause excessive X-ray emissions.
WARNING 3:An electrolytic capacitor installed with the wrong polarity might explode.

CA19JS 2-1

2 Product Specifications

2-1 Specifications

Picture Tube 19-Inch (48 cm): 18-inch (45.8 cm) viewable, Perfect Flatness ,

90˚ Deflection, Semi- tint, Invar shadow mask, Anti-static silica coating

0.20 mm Dot pitch (Horizontal)
Scanning Frequency Horizontal : 30 KHz ~ 85 KHz (Automatic) Vertical : 50 Hz ~ 160 Hz (Automatic)
Display Colors Unlimited colors
Maximum Resolution Horizontal : 1600 Dots Vertical : 1200 Lines @ 68 Hz
Input Video Signal Analog, 0.7 Vp-p positive at 75 Ω, internally terminated
Input Sync Signal Separate H/V Sync, TTL level, positive/negative
Maximum Pixel Clock rate 185 MHz

Active Display Horizontal : 352mm ± 3 mm Vertical : 264 mm ± 3 mm
Input Voltage AC 90 ~ 264 Volts, 60 Hz / 50 Hz ± 3 Hz
Power Consumption 110 Watt (max)
Dimensions (W x D x H)

Unit/Gross

17.03 x 18.07 x 17.91 Inches (440 x 459 x 455 mm) / 21.88 x 23.46 x 19.56 Inches (556 x 596 x 497 mm)
Weight (Unit/Gross) 45.19 lbs (20.5 kg) / 50.71 lbs (23.0 kg)
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 %

• Above models comply with SWEDAC MPR II / TCO95 recommendations for reduced electromagnetic fields.

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

Item

Description

CONFIDENTIAL

2 Product Specifications

2-2 CA19JS

2-2 Pin Assignments

5

15

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

Sync
Type

Pin No.

Macintosh

Separate

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15

Red
Green
Blue
N-C
GND (DDC)
GND-R
GND-G
GND-B
N-C
GND-Sync./Self-raster
N-C
DDC Data
H-Sync.
V-Sync.
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.

CONFIDENTIAL

2 Product Specifications

CA19JS 2-3

QRS

P

O

Video

Sync

Sync

Horizontal

Vertical

CDE

P

O

B

A

Video

Sync

Sync

Separate Sync

2-3 Timing Chart

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

C D

A

O

E

B

P

Video

Sync

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

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

Frequency
(MHz)

Polarity
H.Sync

V.Sync
Remark

IBM

VESA

800/85 Hz
800 x 600

1024/85 Hz
1024 x 768

VGA3/60 Hz

640 x 480

VGA2/70 Hz

720 x 400

31.469

31.777

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

2.222

17.778

1.556

85.008

11.764

0.671

0.578

11.093

0.023

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

1024/75 Hz
1024 x 768

60.023

16.660

1.219

2.235

12.698

0.203

75.029

13.328

0.05

0.466

12.795

0.017

78.750

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

640/85 Hz
640 x 480

Table 2-1 Timing Chart

Mode

Timing

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

1280/75 Hz

1280 x 1024

640/75 Hz
640 x 480

37.500

26.667

2.032

3.810

20.317

0.508

75.000

13.333

0.08

0.427

12.800

0.027

31.500

Negative
Negative
Separate

CONFIDENTIAL

2 Product Specifications

2-4 CA19JS

Memo

CONFIDENTIAL

3-1-1 Before Disassembly

1. Disconnect 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. Tilt the monitor by lifting at the rear.

4. Push the opening jig in to each groove along
the side of the monitor until it makes a “ttak”
sound. (2 grooves : Left and right, make sure
each snap is disengaged.)

5. Pull the rear cover up and away from the
monitor.

CA19JS 3-1

CONFIDENTIAL

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the
CA19JS 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

3 Disassembly and Reassembly

6. Remove the shield.(TCO 95)

7. Using pinch-nose pliers or long-nose pliers,
carefully 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. Loosen the screw on the CRT neck and
remove the CRT socket PCB from the CRT.

3. Disconnect all connectors on the CRT socket
PCB.

4. Using a soldering iron, disconnect the 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. Desolder the 4 tabs on the CRT socket PCB
and remove shield.

7. 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 CN603 on
the main PCB.

3. Disconnect all easily accessible ground wires
on the PCB and bottom chassis.

4. Disconnect the DY connector at the CN403
connector on the main PCB.

5. Using the jig, release the snaps (2) connecting
the front cover and the PCB then lift up the
bottom to separate the two shields.

6. Disconnect the tilt connector at the

CN304 connector on the main PCB.

7. Disconnect the sub PCB connector at the
CN203 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 assy and remove
the remaining ground wires.

10. Place the main PCB assy on a flat, level surface
that is protected from static electricity.

3-1-5 CRT Assy Disassembly

1. Complete all previous steps.

2. Straighten the degaussing coil assembly
coated metal ties and lift the coil assy 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.

3-2 CA19JS

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: TTL level, negative/positive

4-1-1 (d) SCANNING FREQUENCY

Horizontal: 30 KHz ~ 85 KHz (Automatic)
Vertical: 50 Hz ~ 160 Hz (Automatic)

Unless otherwise specified, adjust at the
1024 x 768 mode (68 KHz/85 Hz) signal.

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, 2.5, 3 mm

2. Non-metallic (+) screwdriver:

1.5, 2.5, 3 mm

3. Digital Multimeter (DMM), or
Digital Voltmeter

4. Signal generator, or
DM200 software

5. 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 equipment.

CA19JS 4-1

4 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).

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 Alignment and Adjustments

4-2 CA19JS

CONFIDENTIAL

4-2-1 HIGH VOLTAGE

Signal: 1024 x 768 (68 KHz/85 Hz)
Display image: Don’t care
Contrast: Minimum
Brightness: Minimum
Limit: 27.5 kV ± 0.5 kV

Measure the high voltage level at the anode cap.
High voltage should be within the limit as above.

4-2-2 SCREEN VOLTAGE CHECK

CONDITIONS

Signal: 1024 x 768 (68 KHz/85 Hz)
Display image: Full White Pattern

Contrast: Minimum
Brightness: Minimum
Limit: 27.5 kV ± 0.5 kV

No Adjustment.
Only check with below table.

Table 4-1

4-2-3 CENTER RASTER

Adjust VR401 so that the back raster comes to the
center when you apply each basic mode.

4-2-4 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.

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

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

Scanning frequency: 68 KHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum

Use control bar after selecting “H-SIZE” in left
menu to adjust the horizontal size of the display
pattern to 352 mm with OSD “H-SIZE” fixed “39”.
(Tolerance: ±3 mm.)

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

Scanning frequency: 68 KHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum

Use control bar after selecting “V-SIZE” in left
menu to adjust the vertical size of the display
pattern to 264 mm. (Tolerance: ± 3 mm.)

4-2 Display Control Adjustments

C

A

DISPLAY AREA

EDGE OF BEZEL

B

D

CRT Type

Screen Voltage

SDI

M46QCK 761X850

570V

± 10V

4 Alignment and Adjustments

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

Scanning frequency: 68 KHz/85 Hz
Display image: Crosshatch pattern

Use control bar after selecting “H-POSITION” in
left menu to center the horizontal image on the
raster.

4-2-4 (d) VERTICAL POSITION ADJUSTMENT
CONDITIONS

Scanning frequency: 68 KHz/85 Hz
Display image: Crosshatch pattern

Use control bar after selecting “V-POSITION” in
left menu to center the vertical image on the
raster.

4-2-5 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 4-2, an
image appears distorted, elongated or squashed.

Horizontal Linearity = 2x x100

Vertical Linearity = 2x x100

Table 4-2

❈ Preset Mode : 68 KHz / 85 Hz

Pre-load Mode : Refer to Timing Chart

4-2-5 (a) HORIZONTAL LINEARITY ADJUSTMENT
CONDITIONS

Scanning frequency: 68 KHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum

To adjust Horizontal Linearity, refer to Table 4-2
for the tolerance range.

Increase or decrease H_LIN to optimize the
image.

4-2-5 (b) VERTICAL LINEARITY ADJUSTMENT
CONDITIONS

Scanning frequency: 68 KHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum

To adjust the Vertical Linearity, refer to Table 4-2
for the tolerance range.

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

CA19JS 4-3

CONFIDENTIAL

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

4 Alignment and Adjustments

4-2-6 Trapezoid Adjustment

CONDITIONS

Scanning frequency: 68 KHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum

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

Figure 4-4. Trapezoid

4-2-7 Pinbalance Adjustment

CONDITIONS

Scanning frequency: 68 KHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum

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

4-2-8 Parallelogram Adjustment

CONDITIONS

Scanning Frequency: 68 KHz/85 Hz
Display image: Crosshatch pattern
Brightness: Maximum
Contrast: Maximum

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

Figure 4-6. Parallelogram

4-2-9 Side Pincushion Adjustment

CONDITIONS

Scanning frequency: 68 KHz/85 Hz
Display image: Crosshatch pattern

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

4-2-10 Degauss

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

4-2-11 To Delete the User Mode Data

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

4-2-12 Save the Data

To save the adjustment data for a mode, press
“@3: ALL MODE SAVE” in right menu.

4-4 CA19JS

CONFIDENTIAL

| A - B | < 4 mm

A

4 mm

B

B

A

D1 D2 D1

Figure 4-5. Pinbalance

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

Figure 4-7. Pincushion

C2

C1

D1 D2

| D1 |, | D2 | ≤ 2.0 mm

4 Alignment and Adjustments

CA19JS 4-5

CONFIDENTIAL

CAUTION: Check below condition before color

adjustment Video signal : Analog 0.7
Vp-p (at 75 Ω)
Sync : TTL level (H, V seperate signal)

* Select “Color” in Softjig menu for color adjustment.

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 image: White flat field at

center of display area

Luminance: Maximum

PROCEDURE

Use the directions in sections 4-3-2 through 4-3-3
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

4-3-2 Color Adjustments

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

Scanning frequency: 68 KHz/85 Hz
Display image: Back raster pattern
Brightness: Maximum
Contrast: Maximum

1. Select “@1: CHANNEL 1” in right menu to

control the color for 9300K.

2. Adjust the luminance of the back raster to
between 0.5 to 0.7 ft-L using control bar after
selecting “GREEN CUTOFF” in the menu.

3. Use control bar after selecting “BLUE
CUTOFF” in left menu to set the “y”
coordinate to 0.298 ± 0.02

4. Use control bar after selecting “RED
CUTOFF” in left menu to 0.283 ± 0.02

* If color values can not be matched to desirable

values, repeat sequences 3 and 4 after
readjusting “GREEN CUTOFF” control.

4-3-2 (b) WHITE BALANCE ADJUSTMENT
CONDITIONS

Scanning frequency: 68 KHz/85 Hz
Display image: White box pattern
Brightness: 0.06 ft-L at Back Raster

Pattern Display

Contrast: Maximum

Figure 4-8. White Box Pattern

1. Use control bar after selecting “RED GAIN”,
“GREEN GAIN” and “BLUE GAIN” to adjust

the luminance to 36ft-L with the color
coordinates ranged for
9300K to x = 0.283 ± 0.02, y = 0.298 ± 0.02.

4-3-2 (c) HIGH LIGHT ZONE ADJUSTMENT
CONDITIONS

Scanning frequency: 68 KHz/85 Hz
Display image: White box pattern
Brightness: 0.06ft-L at Back Raster

Pattern Display

Contrast: Maximum

Figure 4-9. High Light Box Pattern

1. Select “@9: BMFULL” in right menu.

2. Use control bar after selection “BM CONT” to
adjust the luminance to
65ft -L (± 5 ft-L)

3. Select “@0: BM OFF” in right menu.

1/3H-1/2H

1/3V-1/2V

FRONT BEZEL OPENING
BACK RASTER

WHITE WINDOW

1/3H-1/2H

1/3V-1/2V

FRONT BEZEL OPENING
BACK RASTER

WHITE WINDOW

4-3 Color Adjustments

4 Alignment and Adjustments

4-6 CA19JS

CONFIDENTIAL

4-3-2 (d) ABL ADJUSTMENT
CONDITIONS

Scanning frequency: 68 KHz/85 Hz
Display image: Full white pattern
Brightness: 0.06ft-L at Back Raster

Pattern Display

Contrast: Maximum

Figure 4-10. Full White Pattern

1. Check the ABL. If it is not within
specifications, use the ABL controls to adjust.
(30 ± 1ft-L)

2. Select “@4: COLOR SAVE” to save the data.

3. Select “@6: ALL COLOR SAVE” to save CH2.

4-3-2 (e) WHITE BALANCE ADJUSTMENT VERIFICATION
CONDITIONS

Scanning frequency: 68 KHz/85 Hz
Display image: Back raster pattern

Full White Pattern

X-Y Coordinates: x = 0.283 ± 0.02,

y = 0.298 ± 0.02
ABL Luminance Refer to 4-3-2(c)
Brightness: Maximum
Contrast: 5 ft-L, 24 ft-L

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.

3. Select “Geometry” in softjig menu.

4. Select “@7: 5-ft “ in right menu.

5. Check whether the white coordinates of the
video meet the above coordinates spec.

6. Select “@8: 24-ft “ in right menu.

7. 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.

Select “Color” and click “@2: CHANNEL 2”
for color ajdustment for 6500K.
Repeat the sequence for 9300K adjustment.
Luminance values are the same as 9300K, but
the color coordinats of back raster and white
box are : x = 0.313 ± 0.02 y = 0.329 ± 0.02

4-3-3 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
Brightness: Cut off point at 24 ft-L
Contrast: Maximum

PROCEDURE

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

Figure 4-11. Luminance Uniformity Check Locations

FRONT BEZEL OPENING
BACK RASTER

WHITE WINDOW

4 Alignment and Adjustments

4-3-4 Focus Adjustment

CONDITIONS

Scanning frequency: 68 KHz/85 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.

4-3-5 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. Make sure the spacing between the PCM

assembly and the CRT stem is 29 mm ± 1 mm.

3. Display a green pattern over the entire display

area.

4. 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)

Table 4-3. Color Purity Tolerances

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

5. When you have the PCMs properly adjusted,

carefully glue them together to prevent
movement during shipping.

CA19JS 4-7

CONFIDENTIAL

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

4 Alignment and Adjustments

Memo

4-8 CA19JS

CONFIDENTIAL

CONFIDENTIAL

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.

• 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 FH1,

D601_1/2/3/4, IC601.

Chirping noise exists?

No

Repeating start?

No

IC601 Pin 1 waveform is right?

1

Yes

C609 Voltage is 20 V ± 0.5V?

Yes

Yes

No

No

Check and replace IC601,
D609, Q402, Q404, Q403.

Check and replace D606.

Check and replace

IC601, SW601 and ZD600.

Check and replace IC201, IC301,

IC401, Q402 and Q404.

WAVEFORMS

100 V (IC601, #1)

1

CH1 P-P = 100 V CH1 RMS = 350.2 V

Yes

Normal operation?

Yes

Verify voltages.

Done.

CA19JS 5-1

No

Replace Main board.

5 Troubleshooting

5-1-2 DPMS Failure

CONFIDENTIAL

Check signal source

H/V sync. video level.

Make No H/V sync.

(power off mode)

LED blinks?

Yes

+12 V line off?

Yes

Q610 Base

voltage exists?

No

No

Yes

Check IC201 Pin 40.

Check IC201 Pin 5.

Check IC201 Pin 5.

Check and replace Q610.

WAVEFORMS

100 V (IC601, #1)

2

CH1 P-P = 100 V CH1 RMS = 325.8 V

No

2

IC601 Pin 1 output

voltage exists?

Yes

Done

No

Refer to 5-1-1 No Power Supply.

5-2 CA19JS