SAMSUNG CSE780BTXAA 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

CSE700P (CSE7839)
CSE700IFT (CSE780B)
CSE7829
CSE900P (CSE9839)
CSE900IFT (CSE980B)
CSE9829

Samsung Electronics Co., Ltd. December 1998.
Printed in Korea
Code No.: BH68-00076A

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.

CSE78**T/CSE98**T 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 CSE78**T/CSE98**T

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): 16.0-inch (40.6 cm) viewable, 19-Inch (48.2 cm): 18-inch (45.8 cm) viewable,

0.20mm (Horizontal), 0.24mm (Diagonal) Dot pitch, Full-square flat-face tube, 90˚ Deflection,
Anti-Reflection coating with Anti-electrastatic, Medium short persistence phosphor

Scanning Frequency Horizontal : 30 kHz to 96 kHz (Automatic)

Vertical : 50 Hz to 160 Hz (Automatic)
Display Colors Unlimited colors
Maximum Resolution Horizontal : 1600 Dots

Vertical : 1200 Lines
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 ± 5%/negative (Video on Vp-p positive)
Maximum Pixel Clock rate 205 MHz
Active Display CSE7839L; Horizontal : 306 mm ± 3 mm (4:3 ratio)

Vertical : 230 mm ± 3 mm

CSE9839L; Horizontal : 352 mm ± 3 mm (4:3 ratio) / 330 mm ± 3 mm (5:4 ratio)

Vertical : 264 mm ± 3 mm
Input Voltage AC 90 to 264 Volts, 60/ 50 Hz ± 3 Hz
Power Consumption 130 Watt (max)
Dimensions 17” 19”

Unit (W x D x H) 16.3x17.5x17.2 Inches (415 x 445.7 x 437.3 mm) 18.4x19.6x19 Inches (468 x 499 x 483.2 mm)
Carton (W x D x H) 21x22.3x21.6 Inches (535 x 566 x 549 mm) 22.6x23.2x22.8 Inches (573 x 590 x 580 mm)

Weight (Net/Gross) 17”; 40.8 lbs (18.5 kg) / 49.6 lbs (22.5 kg)

19”; 49.6 lbs (22.5 kg) / 58.8 lbs (26.7 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 %

• CSE7839L/CSE9839L complies with SWEDAC (MPR II) recommendations for reduced electromagnetic fields.

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

CSE78**T/CSE98**T 2-1

Item Description

2 Product Specifications

2-2 CSE78**T/CSE98**T

800/85 Hz
800 x 600

1280/85 Hz

1280 x 1024

640/85 Hz
640 x 480

VGA3/60 Hz

640 x 480

VGA2/70 Hz

720 x 400

QRS

P

O

Video

Sync

Sync

Horizontal

Vertical

CDE

P

O

B

A

Video

Sync

Sync

Separate Sync

Table 2-1. Timing Chart (17”)

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

1.016

1.422

8.127

0.406

85.024

11.761

0.033

0.483

11.235

0.011

157.500

Positive
Positive

Separate

Mode

IBM VESA MAC.

Timing

2-2 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

VIDEO

A

B

O

P

Q

R

S

Horizontal

Vertical

H/V Composite Sync

Sync-on-Green

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

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

49.726

20.110

1.117

3.910

14.524

0.559

74.551

13.414

0.060

0.784

12.549

0.020

57.284

Negative
Negative

SOG

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

81.400

12.285

0.988

1.624

9.037

0.635

100.000

10.000

0.037

0.516

9.435

0.012

113.309

Negative

Positive

Separate

1024/75 Hz
1024 x 768

1024/85 Hz
1024 x 768

832/75 Hz
832 x 624

1024/100 Hz

1024 x 768

1280/75 Hz

1280 x 1024

Green

Horizontal

B

Vertical

P

Q

R

O

S

2 Product Specifications

CSE78**T/CSE98**T 2-3

QRS

P

O

Video

Sync

Sync

Horizontal

Vertical

CDE

P

O

B

A

Video

Sync

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

VIDEO

A

B

O

P

Q

R

S

Horizontal

Vertical

H/V Composite Sync

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 2-2. Timing Chart (19”)

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

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
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
Positive

Separate

81.400

12.285

0.988

1.624

9.037

0.635

100.000

10.000

0.037

0.516

9.435

0.012

113.309

Negative

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
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
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

1024/85 Hz
1024 x 768

1024/100 Hz

1024 x 768

1152/75 Hz
1152 x 870

1280/75 Hz

1280 x 1024

1280/85 Hz

1280 x 1024

Green

Horizontal

B

Vertical

P

Q

R

O

S

Memo

2 Product Specifications

2-4 CSE78**T/CSE98**T

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

1. 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

1. Remove the 6 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 CRT Socket PCB

1. Disconnect connectors GT186 and GT188 on
the CRT PCB Assembly.

2. Disconnect the CRT Socket PCB Assembly.

3-1-7 Removing the Video PCB Assembly

1. Remove the 4 screws (both side and Rear part
of Main PCB Bracket) on the Video PCB.

2. Disconnect CN104, CN102 and CN103 on the
Video PCB Assembly.

3. Lift off the Video PCB Assembly.

CSE78**T/CSE98**T 3-1

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the
CSE78**T/CSE98**T 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.

3-1-8 Removing the Video PCB Assembly

Rear Shield and Video PCB

1. Remove the 8 screws on the PCB Assembly.

2. Using pinch-nosed pliers or long-nosed pliers,
pull both side taps of Video PCB Assembly.

3. Lift off the Video PCB Assembly Rear Shield.

4. Remove the 3 screws on the Video PCB
Bracket.

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

3-1-9 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 side of
the left.

3. Disconnect CN203, CN601, H_DY, CN205 and
Anode Cap on the Main PCB Assembly.

3-1-10 Removing the Main PCB

1. Remove 7 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.

3-1-11 Removing the Bracket

1. Remove the 10 screws on the Front Cabinet.

3-1-12 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 CSE78**T/CSE98**T

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

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

4-1-1 (e) 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 (f) +B 210 V LINE ADJUSTMENT

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

4-1-1 (g) HIGH VOLTAGE ADJUSTMENT

Signal: 1024 x 768 mode (68 kHz/85 Hz)
Display image: Full white
Contrast: Maximum
Brightness: Maximum
Limit: 27 kV ± 0.5 kV (19Ó)

26 kV ± 0.5 kV (17Ó)

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

PROCEDURE

1. Turn the power off and disconnect the AC line

cord from the power source.

2. Unsolder and remove VR501 on the Main

PCB.

3. Replace VR501 and adjust the high voltage to

the specification.

4. Using a soldering iron, melt the adjustment

cap on VR501 to prevent any movement.

4-1-1 (h) 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 SDD is 600 V ± 10 V, for
Hitachi it is 600 V ± 10 V and for Toshiba it is
700 V ± 10 V.

4-1-1 (i) CENTER RASTER

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

CSE78**T/CSE98**T 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.

4-1-1 (j) 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 cg17p.c data file
Samsung DM200, or DisplayMate for
Windows from Sonera Technologies

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

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

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

11. 5 V DC adapter, not supplied

Note: SoftJig 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 equipment

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 CSE78**T/CSE98**T

MONITOR

INTERFACE
BOARD VER. 2.0

PC

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

PC

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) - 19Ó,
306 mm (H) x 230 mm (V) - 17Ó.
1024 x 768 mode (68 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: 68 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 (19Ó), 306 mm (17Ó). (Tolerance: ± 3 mm.)

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
264 mm (19Ó), 230 mm (17Ó). (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 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: 68 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

CSE78**T/CSE98**T 4-3

4-2 Display Control Adjustments

C

A

DISPLAY AREA

EDGE OF BEZEL

B

D

4 : 3 (19”)

4 : 3 (17”)

5 : 4 (19”)

Horizontal: 20.5~23.5
Vertical : 20.5~23.5

Horizontal: 17.8~20.5
Vertical : 17.8~20.5

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 0.96 mm
Vertical : Less than 0.96 mm

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

4 : 3 (19”)

4 : 3 (17”)

5 : 4 (19”)

Horizontal: 20.9~23.1
Vertical : 20.9~23.1

Horizontal: 18.2~20.1
Vertical : 18.2~20.1

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 0.77 mm
Vertical : Less than 0.77 mm

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

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

Click on the << or >> box next to TRAPE 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

Click on the << or >> box next to PIN_BAL 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

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: 68 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: 68 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, click USER DELETE.

4-2-10 Save the Data

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

4 Alignment and Adjustments

4-4 CSE78**T/CSE98**T

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

Figure 4-7. Pincushion

A

5 mm

B

A

B

| D1 |, | D2 | ≤ 2.0 mm

Figure 4-5. Pinbalance

D1 D2 D1

C2

D2D1

C1

| 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) - 19Ó

306 (H) x 230 (V) - 17Ó

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 (19Ó), 30 ± 1 ft-L (17Ó).

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

CSE78**T/CSE98**T 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 CSE78**T/CSE98**T

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) - 19Ó

306 (H) x 230 (V) - 17Ó
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

CSE78**T/CSE98**T 4-7

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

Figure 4-10 Luminance Uniformity Check Locations

Memo

4 Alignment and Adjustments

4-8 CSE78**T/CSE98**T

CSE78**T/CSE98**T 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.

Done.

Repeating start?

Check and replace Q631, Q632, Q601,

ZD601, D603, R607 and D604.

No

Yes

IC601 Pin 1 waveform is right?

Check and replace IC601,

IC602, IC604.

Yes

No

IC602 and IC604

are right?

Replace parts and verify voltages.

Yes

No

Normal operation

Replace Main board.

Yes

Verify voltages.

Yes

No

WAVEFORMS

1

1

544 V (IC601, #1)

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

5 Troubleshooting

5-2 CSE78**T/CSE98**T

5-1-2 DPMS Failure

Make No H/V sync (power off

mode)

Check signal source

H/V sync video level.

LED blinks

Check IC201 Pin 31.

Yes

No

+12 V line off

Check IC201 Pin 1.

Yes

No

Q632 Base driving voltage exists?

Check IC201 Pin 2.

Check and replace Q632.

Yes

No

Done

5 Troubleshooting

CSE78**T/CSE98**T 5-3

5-1-3 H_Deflection Failure

IC401 Pin 6 waveform is right?

Q405 source waveform

is right?

Check Q405, R422, R423, D406

and D415, +220 V line.

Yes

Yes

No

1. Check R401, +12 V line.

2. Check IC401 Pins 7~6, 6~5.

3. Replace IC401.

No

Q406 gate, drain

waveforms are right?

Check R426, Q406.

Check +35 V line.

Yes

No

Q407 base, collector

waveforms are right?

Check and replace Q407 and D412.

Check DY connector connection.

No

No

IC251 Pin 4 is high?

Replace IC251.

Check some parts around

Q253 and Q254.

Yes

No

Check some parts around Q252.

IC251 Pin 26 waveform

is right?

Check some parts around IC251.

Yes

No

WAVEFORMS

2

3

4

5

6

8

7

3

230 V (Q405, Source)

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

8

12.08 V (IC251, #26)

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

2

10.96 V (IC401, #6)

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

5

54 V (Q406, Drain)

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

4

11.6 V (Q406, Gate)

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

6

18.6 V (Q407, Base)

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

7

1.216 kV (Q407, Collector)

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

5 Troubleshooting

5-4 CSE78**T/CSE98**T

5-1-4 S Correction Failure

S1~S5 signals are right at each

frequency block?

Check S1 ~ S5 signal.

Check and replace Q409~Q413,

C430, C431, C433, C434, C435,

C437 and C441.

Yes

5-1-5 H_Lin. Failure

IC201 Pin 4 voltage varies with

different H_Lin. DAC values?

IC403 Pin 7 voltage varies with

different H_Lin. DAC values?

Check +12 V, –14 V line.

Check some parts around IC403.

Check L402.

Yes

Yes

No

Check and replace IC201.

No

Replace IC201.

No

7-1-6 Invariable H_Size

IC251 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 IC401,

IC251 Pin 28.

Yes

No

Check and replace IC251.

No

5 Troubleshooting

CSE78**T/CSE98**T 5-5

5-1-7 Abnormal H_Size

IC201 Pin 42 output duty varies

with different B+ offset DAC

values?

T402 Pin 8 waveform is right?

Check and replace T402.

Check some parts around D407.

Yes

Yes

No

Check and replace IC201.

Check some parts IC201 Pin 42,

IC251 Pin 28 and IC401 Pin 2.

No

5-1-8 Side Pin or Trap Failure

IC251 Pin 24 output exists?

Yes

Check and replace IC251.

Check and replace IC401.

Check some parts IC401 Pin 2

and IC251 Pin 24.

5-1-9 Para. or Pin Balance Failure

IC251 Pin 24 output varies with

different DAC values?

No

Replace IC251.

No

WAVEFORMS

9

9

29.8 V (T402, #8)

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

5 Troubleshooting

5-6 CSE78**T/CSE98**T

5-1-10 Tilt Failure

IC201 Pin 6 output duty varies

with different DAC values?

IC403 Pin 8 output varies with

different DAC values?

Check and replace IC403.

Check and replace CRT.

Yes

Yes

No

Check and replace IC201.

No

Check tilt connector connection

5-1-11 V Deflection Failure

±14 V line is on?

IC251 Pin 23 output exists?

Check and replace IC251.

Yes

Yes

No

Refer to 7-1-1 No Power Supply

No

IC301 Pin 1 input exists?

Check R262 and R309.

Yes

No

IC301 Pin 5 output exists?

Check and replace some parts

around IC301.

No

No

Check V DY connector connection.