Samsung CKB5237L User manual

COLOR MONITOR
CKB5237L
CKB7227L
Manual
SERVICE
COLOR MONITOR CONTENTS
– +
MENU
EXIT
1. Precautions
2. Product Specifications
3. Operating Instructions
4. Disassembly & Reassembly
5. Alignment & Adjustments
6. Troubleshooting
7. Exploded View & Parts List
8. Block Diagram
9. Wiring Diagram
10. PCB Diagrams & Electrical Parts List
11. Schematic Diagrams

Samsung Electronics Co., Ltd. October 1997
Printed in Korea
Code No.: BH68-60934A

1-1-1 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.
1-1-2 Servicing the High Voltage System 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 10k
ohm resistor in series with an insulated wire
(such as a test probe) between the chassis and
the anode lead. (Disconnect the AC line cord
from the AC outlet.)
2. High Voltage VR Replacement
If the high voltage system requires
adjustment, use the following procedure (all
steps are required):
a. Turn the power off and disconnect the AC
line cord from the power source.
b. Unsolder and remove the high voltage VR
on the Main PCB.
c. Replace the VR and adjust the high voltage
to the specification.
d. Using a soldering iron, melt the adjustment
cap on the high voltage VR to prevent any
movement.
3. It is essential that service technicians have an
accurate high voltage meter available at all
times. Check the calibration of this meter
periodically.
4. When troubleshooting a monitor with
excessively high voltage, avoid being
unnecessarily close to the monitor. Do not
operate the monitor for longer than is
necessary to locate the cause of excessive
voltage.
5. High voltage should always be kept at the
rated value, no higher. Be sure all service
personnel are aware of the procedures and
instructions covering X-rays.
The only potential source of X-ray in current
solid state display monitors is the tube.
However, the CRT does not emit measurable
X-ray radiation if the high voltage is at the
high voltage adjustment value.
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.
6. When the high voltage regulator is operating
properly, there is no possibility of an X-ray
problem. Test the brightness and use a meter
to monitor the high voltage each time a color
monitor comes in for service. Make sure the
high voltage does not exceed its specified
value and that it is regulating correctly.
7. The CRT is especially designed to prohibit
X-ray emissions. To ensure continued X-ray
protection, replace the CRT with only one that
is the same or equivalent type as the original.
Carefully reinstall the CRT shields and
mounting hardware; these also provide X-ray
protection.
8. Handle the CRT only when wearing
shatterproof goggles and after completely
discharging the high voltage anode.
9. Do not lift the CRT by the neck.
CKB5237L/7227L 1-1
1 Precautions
Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential
hazards such as electrical shock and X-rays.
1-1 Safety Precautions

1-1-3 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.
Figure1-1. Leakage Current Test Circuit
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.
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.
1 Precautions
1-2 CKB5237L/7227L
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
!

1-2-1 General Servicing Precautions
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 a test component 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.
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.
1 Precautions
CKB5237L/7227L 1-3
1-2 Servicing Precautions
WARNINGS: A high voltage VR replaced in the wrong direction may cause excessive X-ray
emissions.
An electrolytic capacitor installed with the wrong polarity might explode.
Cautions: Before servicing instruments covered by this service bulletin, read and follow the
Safety Precautions section of this manual.
When replacing the high voltage adjustment VR, it must be fixed by a soldering iron
after it is properly set.
Note: If unforeseen circumstances create conflict between the following servicing precautions and
any of the safety precautions, always follow the safety precautions.

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 wrist-strap
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.
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
1-4 CKB5237L/7227L
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 field-effect transistors. The following techniques will reduce the incidence of
component damage caused by static electricity.

CKB5237L/7227L 2-1
2 Product Specifications
2-1 Specifications
Picture Tube: 17-Inch (43 cm): 15.7-inch (39.80 cm) viewable; 15-Inch (38 cm): 13.8-inch (35 cm) viewable;
Full-square flat-face tube, 90˚ Deflection, 0.28 mm Dot pitch, Semi- tint, Non-glare, Invar
shadow mask, Anti-static silica coating
Scanning Frequency Horizontal : 30 kHz to 70 kHz (Automatic)
Vertical : 50 Hz to 120 Hz (Automatic)
Display Colors Unlimited colors
Maximum Resolution Horizontal : 1280 Dots
Vertical : 1024 Lines
Input Video Signal Analog, 0.714 Vp-p positive at 75 Ω, internally terminated
Input Sync Signal Separate Sync : TTL level positive/negative
Maximum Pixel Clock rate 110 MHz
Active Display CKB5237L ; Horizontal : 267 mm ± 3 mm, Vertical : 200 mm ± 3 mm
CKB7227L ; Horizontal : 306 mm ± 3 mm (4:3 ratio), Vertical : 230 mm ± 3 mm
Input Voltage AC 90 to 264 Volts, 60 Hz or 50 Hz ± 3 Hz
Power Consumption 90 Watt (max) : 17”, 85 Watt (max) : 15”
Dimensions
Unit (W x D x H) 14.6 x 15.6 x 15.5 Inches (370 x 397 x 394 mm), 16.8 x 17.0 x 17.1 Inches (426 x 433 x 434 mm)
Carton (W x D x H) 18.2 x 21.0 x 17.7 Inches (462 x 534 x 450 mm) 21.3 x 21.8 x 21.2 Inches (541 x 554 x 538 mm)
Weight CKB5237L : 30 lbs (13.6 kg) / 35.3 lbs (16.0 kg)
(Net/Gross) CKB7227L : 40.8 lbs (18.5 kg) / 46.7 lbs (21.2 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 %
CRT Code No. BH03-10337T : M41KUN36X03(E/L/LP), Silica Coating - 17”
BH03-10337U : M41KUN36X03(A/L/LP), Multi Coating - 17”
BH03-10337V : M41KUN36X03(T4/L/LP), Multi Coating (TCO) - 17”
BH03-10337W : M41KUK35X02(E/LP), ESF - 15”
BH03-10337X : M36KUK35X02(T4/LP), Multi Coating (TCO) - 15”
• Above models comply with SWEDAC (MPR II) recommendations for reduced electromagnetic fields.
• Designs and specifications are subject to change without prior notice.
Item Description
CKB5237L CKB7227L

2 Product Specifications
2-2 CKB5237L/7227L
2-2 Pin Assignments
5
15
Figure 2-5. Male Type Figure 2-6. Male Type
Sync
Type
Pin No.
15-Pin Signal Cable Connector (Figure 2-5) Cable Adapter (Figure 2-6)
Macintosh
Separate
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Red
Green
Blue
GND
DDC Return
GND-R
GND-G
GND-B
Reserved
GND-Sync/Self-raster
GND
DDC Data
H-Sync
V-Sync
DDC Clock
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

2 Product Specifications
CKB5237L/7227L 2-3
800/75 Hz
800 x 600
640/85 Hz
640 x 480
640/75 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
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
31.469
31.778
3.813
1.907
25.422
0.636
70.087
14.268
0.064
1.080
12.711
0.413
28.322
Negative
Positive
Separate
31.469
31.778
3.813
1.907
25.422
0.636
59.940
16.683
0.064
1.048
15.253
0.318
25.175
Negative
Negative
Separate
37.500
26.667
2.032
3.810
20.317
0.508
75.000
13.333
0.080
0.427
12.800
0.027
31.500
Negative
Negative
Separate
46.875
21.333
1.616
3.232
16.162
0.323
75.000
13.333
0.064
0.448
12.800
0.021
49.500
Positive
Positive
Separate
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
Mode IBM VESA
Timing
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
AO
E
BP
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

2 Product Specifications
2-4 CKB5237L/7227L
Table 2-1. Timing Chart Continued
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
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
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
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
Mode VESA
800/85Hz
800 x 600 1024/85 Hz 1024 x 768
1024/75 Hz
1024 x 768
Timing
Q R S
P
O
Video
Sync Sync
Horizontal Vertical
C D E
P
O
B
A
Video
Sync Sync
Separate Sync
C D
AO
E
BP
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

3-1 Front View and Control
3-1-1 CKB5237L/7227L Front View
CKB5237L/7227L 3-1
3 Opearating Instructions
– +
MENU
EXIT
– +
MENU
EXIT
1
3456
2
789
Figure 3-1. Front Control Panel
Figure 3-2. Rear View
1 Power Button
Power Indicator LED (Dual Color)
Menu Display & Menu Exit
Down Button & Brightness
Up Button & Contrast
Menu Selector Enter Key
3 Pin AC Power Input
USB Jack Input (Optional)
Signal Input
3
4
5
6
7
8
9
2
Location Symbol Description
Table 3-1. Front Panel Controls
MENU
EXIT
–
+

3-2-1 On Screen Display
This monitor features an On-Screen Display (OSD)
that shows information about the display setting.
The OSD appears on the screen when you select a
function button. The OSD can show the name,
range and current setting of the control function.
In addition, the OSD shows the current input
signal frequency and the list of user and factory
preset timings. The OSD remains active for
approximately 5 seconds after the completion of
any adjustment.
3-2-2 OSD Window
Push the menu button to open the OSD. The Main
Menu shows all of the adjustment icons along the
top of the window. The window shows one or
more adjustment names in the Adjustment Box
and instructions display in the Information Bar.
To access a function, use the menu button to move
to its associated icon, and then use the or
button to select the adjustment type. Then,
push the ↵button to access the function.
All OSD windows change color to indicate that
the associated adjustment control is active. When
the OSD displays the name of the adjustment, for
example, Pincushion/Trap, with a green border,
adjustments for pincushion or trapezoidal effects
are available. Each OSD window shows directions
for use along the bottom of the window. When
you are satisfied with the adjustments you have
made to the current control, select the Exit button
to return to the OSD Menu where you can select
another control, or exit from the OSD system and
save your changes. The OSD remains active for
approximately 10 seconds after completion of any
adjustments.
3-2-4 Direct Controls
The on-screen Direct controls have the following
two functions:
•Brightness:With the menu off, push the
button. The brightness display will
appear.
Push the button to increase the
brightness or the button to
decrease the brightness.
•Contrast: With the menu off, push the
button. The contrast adjustment
display will appear.
Push the button to increase the
contrast or the button to
decrease the contrast.
–
+
+
–
+
–
+
–
3 Operating Instructions
3-2 CKB5237L/7227L
MENU
BRIGHTNESS
?

Note 1:This monitor requires a cable adapter for
use with a Macintosh computer. The
MacMaster Cable Adapter supports all
monitors and all Macintosh, Centris,
Quadra, Duo Dock, and Power Macintosh
computers. If you do not already have a
cable adapter, check with your computer
dealer.
Note 2:When used with a computer equipped
with VESA DPMS functions, this monitor
is EPA Energy Star compliant and NUTEK
compliant.
Table 3-2. Display Power Management Signaling (DPMS)
;CKB7227L
Table 3-3. Display Power Management Signaling (DPMS)
;CKB5237L
3 Operating Instructions
CKB5237L/7227L 3-3
State
Items
Normal
Operation
Horizontal Sync
Vertical Sync
Video
Power
Indicator
Power
Consumption/hr
Active
Active
Active
Green Amber Alternating
Amber/Green
Blinking
Amber
Blinking
90 W (max.)
78 W
(nominal)
Less than
15 W
72 W (max.)
65 W
(nominal)
Less than
8 W
Inactive
Active
Blanked
Active
Inactive
Blanked
Power saving function EPA/NUTEK
Stand-By
Mode Suspend Mode Position A Power Off Mode Position B
Inactive
Inactive
Blanked
State
Items
Normal
Operation
Horizontal Sync
Vertical Sync
Video
Power
Indicator
Power
Consumption/hr
Active
Active
Active
Green Amber Alternating
Amber/Green
Blinking
Amber
Blinking
85 W (max.)
70 W
(nominal)
Less than
15 W
72 W (max.)
65 W
(nominal)
Less than
8 W
Inactive
Active
Blanked
Active
Inactive
Blanked
Power saving function EPA/NUTEK
Stand-By
Mode Suspend Mode Position A Power Off Mode Position B
Inactive
Inactive
Blanked

Memo
3 Operating Instructions
3-4 CKB5237L/7227L

4-1-1 Cabinet Disassembly
1. With a pad beneath it, stand the monitor on its
front with the screen facing downward and
the base close to you. Make sure nothing will
damage the screen.
2. Working from the back of the monitor remove
the signal cover cap out, and remove the 4
screws and carefully pull the rear cabinet up
and off the monitor.
3. Remove the 8 screws on the Top Shield and
remove it.
4. Remove the 4 screws on the Bottom Cover and
pull it upward to remove it.
5. Using pinch-nosed pliers or long-nosed pliers,
carefully disconnect the Anode Cap from the
CRT.
4-1-2 Removing the Video PCB &
CRT Socket PCB
1. Follow steps 1 through 5 in “Cabinet
Disassembly,” above.
2. Disconnect connectors CN103.
3. Lift off the CRT Socket PCB Assembly.
4. Hold the CRT Socket PCB Assembly while
you lift the cap on the CRT Socket and pull
out the two focus wires, G2 wire.
5. Remove both side screws on the lower edge of
the Video PCB Ass’y and the screw on the
signal connector and pull the assembly
towards you to remove it.
6. Remove all screws on the Video PCB
Assembly and remove the Video Shield.
7. Lift out the Video PCB and place it on a flat,
level surface that is protected from static
electricity.
4-1-3 Removing the Main PCB
1. Follow steps 1 through 5 in “Cabinet
Disassembly,” steps 1 through 7 in “Removing
the Video PCB and “Removing the CRT
Socket PCB,” above.
2. Disconnect the Degaussing Coil at CN600 on
the Main PCB.
3. Disconnect all easily accessible ground wires
from the CRT GND Assembly and Bottom
Chassis.
4. Disconnect the connector between CN_Tilt. on
the Main PCB and the Tilt coil.
5. Disconnect the DY connector between the DY
and the CN300A_7, CN400, CN401 and CN402
connectors on the Main PCB.
6. Remove the 2 screws on the left and right
sides of the PCB Bracket.
7. Carefully lift the Main PCB Ass’y.
8. Remove the 7 screws on the top side of the
Main PCB.
9. Lift the Main PCB and place it on a flat, level
surface that is protected from static electricity.
CKB5237L/7227L 4-1
4 Disassembly and Reassembly
This section of the service manual describes the disassembly and reassembly procedures for the
CKB5237L/7227L monitors.
WARNING: This monitor contains electrostatically sensitive devices. Use caution when handling
these components.
4-1 Disassembly (CKB7227L)
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.

4-1-4 CRT Ass’y Disassembly
1. Complete all previous steps.
2. Remove the 4 side screws 2 on the top and 2
on either side of the CRT and lift the CRT Unit
Bracket.
3. Unhook the Degaussing Coil Assembly and
lift it off the CRT.
4-2-1 Replacing the CRT
1. Loop the CRT Ground Assembly around the
back of the CRT and under the 3 corner, metal
ears. Position the corner with the spring last.
2. With the Front Cover Assembly lying face
down on a protective pad, position the CRT so
that the corner metal ears fit properly in the
Front Cover Assembly.
3. Replace the 4 corner screws.
4. Replace the Degaussing Coil Assembly and
secure the Coil with the plastic Degaussing
Coil Holders.
5. Replace the CRT Ground Assembly.
6. Replace the Unit Bracket Assembly.
4-2-2 Replacing the Main PCB
1. Stand the monitor on its front with the screen
facing downward.
2. Replace the 7 screws on the top side of the
Main PCB.
3. Position the Main PCB Ass’y in the Front
Cabinet and secure it on both sides with the
screws between the Bottom Chassis and CRT
Unit Bracket.
4. Replace the DY connector at the CN300A_7,
CN400, CN401 and CN402 connectors on the
Main PCB.
5. Replace the connector between CN_Tilt. on
the Main PCB and the Tilt Coil.
6. Replace all easily accessible ground wires on
the CRT GND Assembly and Bottom Chassis.
4. Remove the 4 corner screws and lift the CRT
up and away from the Front Cover Assembly
and place it on a padded surface.
Do not lift the CRT by the neck.
Caution: If you will be returning this CRT to
the monitor, be sure to place the CRT
face down on a protective pad.
7. Replace the Degaussing Coil at CN600 on the
Main PCB.
8. Replace the Anode Cap.
4-2-3Replacing Connector CN103 on the
Video PCB
1. Position the Video Shield and replace all
screws.
2. Replace both side screws on the lower edge of
the Video PCB Ass’y and the screw on the
signal connector.
4-2-4 Replacing the CRT Socket PCB
1. Hold the CRT Socket PCB Ass’y while you lift
the Cap on the CRT Socket and replace the
two Focus wires, G2 wire.
2. Reconnect the CRT Socket on the CRT pins at
the plug/Socket junction.
4-2-5 Cabinet Reassembly
1. Reconnect CN103 on the Video PCB.
2. Position the Top Shield and replace the 8
screws.
3. Replace the 4 screws on the Bottom Cover.
4. Position the Rear Cover making sure that the
tabs along the front edge are properly
snapped in place. Replace the 4 screws.
5. Replace the signal cable cover cap.
6. Set the monitor on its Base and make sure that
the CRT faceplate was not scratched or
otherwise damaged.
4 Disassembly and Reassembly
4-2 CKB5237L/7227L
4-2 Reassembly (CKB7227L)
With the CRT facing downward on a protective pad, use the steps that follow to reassemble the monitor.
!

4-3-1 Cabinet Disassembly
1. With a pad beneath it, stand the monitor on its
front with the screen facing downward and
the base close to you. Make sure nothing will
damage the screen.
2. Working from the back of the monitor remove
the signal cover cap out, and remove the 4
screws and carefully pull the rear cabinet up
and off the monitor.
3. Using pinch-nosed pliers or long-nosed pliers,
carefully disconnect the Anode Cap from the
CRT.
4-3-2 Removing the Video PCB &
CRT Socket PCB
1. Follow steps 1 through 3 in “Cabinet
Disassembly,” above.
2. Remove the 1 screw on the Video Shield Top
position.
3. Disconnect connector C103.
4. Lift off the CRT Socket PCB Assembly.
5. Hold the CRT Socket PCB Assembly while
you lift the cap on the CRT Socket, unsolde 1
point wire, remove 9 pin wire Assembly,
unsolder 4 point on the corner shild of CRT
Socket PCB and remove shield of CRT Socket
PCB.
6. Remove 5 point screws side the lower edge
and back of the Video PCB Assembly, and the
screw on the signal conector and pull the
Assembly towards you to remove it.
7. Remove all screws on the Video PCB
Assembly and remove the Video Shield.
8. Lift out the Video PCB and place it on a flat,
level surface that is protected from static
electricity.
4-3-3 Removing the Main PCB
1. Follow steps 1 through 3 in “Cabinet
Disassembly,” steps 1 through 8 in “Removing
the Video PCB and “Removing the CRT
Socket PCB,” above.
2. Disconnect the Degaussing Coil at CN600 on
the Main PCB.
3. Disconnect all easily accessible ground wires
from the CRT GND Assembly and Bottom
Chassis.
4. Disconnect the connector between CN_Tilt. on
the Main PCB and the Tilt coil.
5. Disconnect the DY connector between the DY
and the CN301_5, CN400, CN401 and CN402
connectors on the Main PCB.
6. Remove the 2 screws on the left and right
sides of the PCB Bracket.
7. Carefully lift the Main PCB Ass’y.
8. Remove the 7 screws on the top side of the
Main PCB.
9. Lift the Main PCB and place it on a flat, level
surface that is protected from static electricity.
4 Disassembly and Reassembly
CKB5237L/7227L 4-3
4-3 Disassembly (CKB5237L)
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.

4-4-1 Replacing the CRT
1. Loop the CRT Ground Assembly around the
back of the CRT and under the 4 corner, metal
ears. Position the corner with the spring last.
2. With the Front Cover Assembly lying face
down on a protective pad, position the CRT so
that the corner metal ears fit properly in the
Front Cover Assembly.
3. Replace the 4 corner screws.
4. Replace the Degaussing Coil Assembly and
wrap the coil with the plastic coated matal ties
to hold the coil in place.
5. Replace the CRT Ground Assembly.
6. Replace the Unit Bracket Assembly.
4-4-2 Replacing the Main PCB
1. Stand the monitor on its front with the screen
facing downward.
2. Replace the 7 screws on the top side of the
Main PCB.
3. Position the Main PCB Ass’y in the Front
Cabinet and secure it on both sides with the
screws between the Bottom Chassis and CRT
Unit Bracket.
4. Replace the DY connector at the CN301_5,
CN400, CN401 and CN402 connectors on the
Main PCB.
5. Replace the connector between CN_Tilt. on
the Main PCB and the Tilt Coil.
6. Replace all easily accessible ground wires on
the CRT GND Assembly and Bottom Chassis.
7. Replace the Degaussing Coil at CN600 on the
Main PCB.
8. Replace the Anode Cap.
4-4-3Replacing Connector CN103 on the
Video PCB
1. Position the Video Shield and replace all
screws.
2. Replace 4 point both and back screws on the
lower edge of the Video PCB Ass’y and the
screw on the signal connector.
4-4-4 Replacing the CRT Socket PCB
1. Hold the CRT Socket PCB Ass’y while you lift
the Cap on the CRT Socket and replace the
Focus wire, G2 wire.
2. Reconnect the CRT Socket on the CRT pins at
the plug/Socket junction.
4-4-5 Cabinet Reassembly
1. Reconnection CN103 both the CRT and the
Video PCB.
2. Solder 1 point CRT PCB and replace 1 screw
Video shield.
3. Replace the 4 screws on the Bottom Cover.
4. Position the Rear Cover making sure that the
tabs along the front edge are properly
snapped in place. Replace the 4 screws.
5. Replace the signal cable cover cap.
6. Set the monitor on its Base and make sure that
the CRT faceplate was not scratched or
otherwise damaged.
4 Disassembly and Reassembly
4-4 CKB5237L/7227L
4-4 Reassembly (CKB5237L)
With the CRT facing downward on a protective pad, use the steps that follow to reassemble the monitor.

5-1-1 Before Making Adjustments
5-1-1 (a) ORIENTATION
When servicing, always face the monitor to the
east.
5-1-1 (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.
5-1-1 (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.
5-1-1 (d) SIGNAL
Analog, 0.714 Vp-p positive at 75 ohm, internal
termination
Sync: Separate
(TTL level negative/positive)
5-1-1 (e) SCANNING FREQUENCY
Horizontal: 30 kHz to 70 kHz (Automatic)
Vertical: 50 Hz to 120 Hz (Automatic)
Unless otherwise specified, adjust at the
17”: 1024 x 768 mode (68 kHz/85 Hz), 15”: 800 x
600 mode (54 kHz/85 Hz) signals.
Refer to Table 2-1 on pages 2-4 and 2-5.
5-1-1 (f) HIGH VOLTAGE ADJUSTMENT
Signal: No signal
Display image: Self raster
Contrast: Maximum
Brightness: Maximum
Limit: 26 kV ± 0.2 kV (17”)
25 kV ± 0.2 kV (15”)
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.
5-1-1 (g) G2 (SCREEN) VOLTAGE ADJUSTMENT (17” ONLY)
Signal: No signal
Display image: Self raster
Contrast: Maximum
Brightness: Maximum
Adjust the Screen VR of the FBT so that the G2
(Screen) Voltage for SDD CRT is 450 V ± 10 V.
5-1-1 (h) CENTER RASTER
Adjust SW401 so that the back raster comes to the
center when you apply a signal of 60 kHz/75 Hz.
CKB5237L/7227L 5-1
5 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).
5-1 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.

5-1-2 Required Equipment
The following equipment may be necessary for
adjustment procedures:
5-1-2 (a) DISPLAY CONTROL ADJUSTMENT
1. Non-metallic (–) screwdriver: 1.5 mm
Non-metallic (–) screwdriver: 3 mm
2. Philips (+) screwdriver: 1.5 mm
3. Non-metallic hexkey: 2.5 mm
4. Digital Multimeter (DMM), or
Digital Voltmeter (DVM)
5. Signal generator, or
Computer with a video board that uses the
ET-4000 chipset (strongly recommended if
using Samsung DM 200 software) and that
displays: 1024 x 768 @ 85 Hz, or 800 x 600
@ 85 Hz (minimum).
6. Personal computer
7. Required software: Softjig.exe from Samsung
which includes the cg17e.c data file
Samsung DM200, or DisplayMate for
Windows from Sonera Technologies
8. Interface Board Ver. 2.0 Code No.
BH81-90001K
9. Parallel communications cable (25-pin to
25-pin); Code No. BH81-90001H
10. Signal cable (15-pin to 15-pin cable with
additional 3-pin connector); Code No.
BH81-90001J
11. 5 V DC adapter, not supplied
Note: SoftJig Ass’y (includes items 8, 9 and 10)
Code No. BH81-90001L
5.1-2 (b) COLOR ADJUSTMENTS
1. All equipment listed in 5-1-2 (a), above
2. Color analyzer, or any luminance
measurement equipment
5-1-3 Connecting the SoftJig
Connect the monitor to the signal generator and/
or PC as illustrated in Figures 5-1 and 5-2.
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.
5-1-4 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.
5 Alignment and Adjustments
5-2 CKB5237L/7227L
MONITOR
INTERFACE
BOARD VER. 2.0
PC SIGNAL
GENERATOR
3-WIRE
CABLE
SIGNAL CABLE
5V DC
ADAPTOR
PARALLEL CABLE
Figure 5-1 : 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 5-2. Setup 2, Without Signal Generator