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COLOR MONITORDP15HS/HTDP17LS/LT
ManualSERVICECOLOR MONITOR CONTENTS
EXITEXIT MENU
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
Samsung Electronics Co., Ltd. May 1999Printed in KoreaCode No.: BH68-00129A
This manual may not, in whole or in part, becopied, photocopied, reproduced, translated, orconverted to any electronic or machine readableform without prior written permission ofSamsung Electronics Co., Ltd.
DP15H*/DP17L* Service ManualFirst edition May 1999.
Printed in Korea.
Trademarks
Samsung is a registered trademark andDP15H*/DP17L* and MacMaster Cable Adapterare trademarks of Samsung Electronics Co., Ltd.
Macintosh, Centris, Quadra, Duo Dock, andPower Macintosh are trademarks of AppleComputer, Inc.
All other trademarks are the property of theirrespective owners.
ii DP15H*/DP17L*
WARNINGS1. For continued safety, do not attempt to modify the
circuit board.
2. Disconnect the AC power before servicing.
3. When the chassis is operating, semiconductorheatsinks 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 voltageadjustment VR, it must be fixed by asoldering iron after it is properly set.
1. When servicing the high voltage system, removethe static charge by connecting a 10 kohm resistorin series with an insulated wire (such as a testprobe) between the chassis and the anode lead.
2. If the HV VR requires adjustment, (a) Replace theVR and adjust the high voltage to the specification.(b) Use a soldering iron to melt the adjustment capon the HV VR to prevent any movement.
3. When troubleshooting a monitor with excessivelyHV, avoid being unnecessarily close to the monitor.Do not operate the monitor for longer than isnecessary to locate the cause of excessive voltage.
4. High voltage should always be kept at the ratedvalue, no higher. Only when high voltage isexcessive are X-rays capable of penetrating the shellof the CRT, including the lead in glass material.Operation at high voltages may also cause failure ofthe CRT or high voltage circuitry.
5. When the HV regulator is operating properly, thereis no possibility of an X-ray problem. Make sure theHV does not exceed its specified value and that it isregulating correctly.
6. The CRT is especially designed to prohibit X-ray emissions. To ensure continued X-rayprotection, replace the CRT only with one that isthe same or equivalent type as the original.
7. Handle the CRT only when wearing shatterproofgoggles and after completely discharging the highvoltage 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 thefollowing safety checks:
1. Inspect each lead dress to make certain that theleads are not pinched or that hardware is notlodged between the chassis and other metal parts inthe monitor.
2. Inspect all protective devices such as nonmetalliccontrol knobs, insulating materials, cabinet backs,adjustment and compartment covers or shields,isolation resistor-capacitor networks, mechanicalinsulators, 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 systemthat complies with American National StandardsInstitute (ANSI C101.1, Leakage Current forAppliances), and Underwriters Laboratories (ULPublication UL1410, 59.7).
4. With the unit completely reassembled, plug the ACline cord directly into a 120V AC outlet. With theunitÕs AC switch first in the ON position and thenOFF, measure the current between a known earthground (metal water pipe, conduit, etc.) and allexposed metal parts, including: metal cabinets,screwheads and control shafts. The currentmeasured should not exceed 0.5 milliamp. Reversethe power-plug prongs in the AC outlet and repeatthe test.
Figure 1-1. Leakage Current Test Circuit
1-1-4 Product Safety NoticesSome electrical and mechanical parts have specialsafety-related characteristics which are often notevident from visual inspection. The protection they givemay not be obtained by replacing them withcomponents rated for higher voltage, wattage, etc. Partsthat have special safety characteristics are identified by
on schematics and parts lists. A substitutereplacement that does not have the same safetycharacteristics as the recommended replacement partmight create shock, fire and / or other hazards. Productsafety is under review continuously and newinstructions are issued whenever appropriate.
Components identified by on schematics and partslists must be sealed by a soldering iron afterreplacement and adjustment.
DP15H*/DP17L* 1-1
1 Precautions
1-1 Safety Precautions
!
DEVICEUNDERTEST
TEST ALLEXPOSED METAL
SURFACES
(READING SHOULDNOT BE ABOVE 0.5mA)
LEAKAGECURRENTTESTER
2-WIRE CORD
ALSO TEST WITHPLUG REVERSED
(USING AC ADAPTERPLUG 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 theAC power source before attempting to: (a) removeor reinstall any component or assembly, (b)disconnect PCB plugs or connectors, (c) connect alltest components in parallel with an electrolyticcapacitor.
3. Some components are raised above the printedcircuit board for safety. An insulation tube or tapeis sometimes used. The internal wiring issometimes clamped to prevent contact withthermally hot components. Reinstall all suchelements to their original position.
4. After servicing, always check that the screws,components and wiring have been correctlyreinstalled. Make sure that the area around theserviced part has not been damaged.
1. Immediately before handling any semiconductorcomponents or assemblies, drain the electrostaticcharge from your body by touching a known earthground. Alternatively, wear a discharging wrist-strap device. To avoid a shock hazard, be sure toremove the wrist strap before applying power tothe monitor.
2. After removing an ESD-equipped assembly, place iton a conductive surface such as aluminum foil toprevent accumulation of an electrostatic charge.
3. Do not use freon-propelled chemicals. These cangenerate electrical charges sufficient to damageESDs.
4. Use only a grounded-tip soldering iron to solder ordesolder ESDs.
5. Use only an anti-static solder removal device. Somesolder removal devices not classified as Òanti-staticÓcan generate electrical charges sufficient to damageESDs.
5. Check the insulation between the blades of the ACplug and accessible conductive parts (examples:metal panels, input terminals and earphone jacks).
6. Insulation Checking Procedure: Disconnect thepower cord from the AC source and turn the powerswitch ON. Connect an insulation resistance meter(500 V) to the blades of the AC plug.
The insulation resistance between each blade of theAC plug and accessible conductive parts (seeabove) should be greater than 1 megohm.
7. Never defeat any of the +B voltage interlocks. Donot apply AC power to the unit (or any of itsassemblies) unless all solid-state heat sinks arecorrectly installed.
8. Always connect a test instrumentÕs ground lead tothe instrument chassis ground before connecting thepositive lead; always remove the instrumentÕsground lead last.
6. Do not remove a replacement ESD from itsprotective package until you are ready to install it.Most replacement ESDs are packaged with leadsthat are electrically shorted together by conductivefoam, aluminum foil or other conductive materials.
7. Immediately before removing the protectivematerial from the leads of a replacement ESD,touch the protective material to the chassis orcircuit assembly into which the device will beinstalled.
Caution: Be sure no power is applied to the chassis or circuit and observe all other safety precautions.
8. Minimize body motions when handlingunpackaged replacement ESDs. Motions such asbrushing clothes together, or lifting your foot froma carpeted floor can generate enough staticelectricity to damage an ESD.
9. Indicates ESDs on the Schematic Diagram inthis manual.
Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonlycalled 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.
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.
Dimensions Unit ; 15” : 14.25 x 15.11 x 15.11 Inches (362 x 384 x 384 mm)(W x D x H) 17” : 16.22 x 16.54 x 16.36 Inches (412 x 420 x 415.5 mm)
Carton ; 15” : 17.87 x 19.57 x 17.52 Inches (454 x 497 x 445 mm)17” : 21.02 x 21.73 x 18.39 Inches (534 x 552 x 467 mm)
Weight 15” : 26.5 lbs (12.0 kg) / 31.5 lbs (14.3 kg)(Net/Gross) 17” : 33.1 lbs (15.0 kg) / 38.6 lbs (17.5 kg)
Environmental Considerations Operating Temperature : 32°F to 104°F (0°C to 40°C)Humidity : 10 % to 80 %Storage Temperature : -4°F to 113°F (-20°C to 45°C)Humidity : 5 % to 95 %
• Above models comply with SWEDAC (MPR II) recommendations for reduced electromagnetic fields.• Designs and specifications are subject to change without prior notice.
Item Description
2 Product Specifications
2-2 DP15H*/DP17L*
2-2 Pin Assignments
5
15
Figure 2-1. Male Type Figure 2-2. Male Type
SyncType
Pin No.MacintoshSeparate
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Red
Green
Blue
N-C
DDC Return
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
2 Product Specifications
DP15H*/DP17L* 2-3
Q R S
P
O
Video
Sync Sync
Horizontal Vertical
C D E
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 standardfor 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
ClockFrequency(MHz)
PolarityH.Sync
V.Sync
Remark
IBM VESA
800/85 Hz800 x 600
1024/75 Hz1024 x 768
1024/85 Hz1024 x 768
VGA3/60 Hz640 x 480
VGA2/70 Hz720 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
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
43.269
23.111
1.556
2.222
17.778
1.556
85.008
11.764
0.671
0.578
11.093
0.023
49.500
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
36.000
Positive
Positive
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
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
800/75 Hz800 x 600
640/75 Hz640 x 480
640/85 Hz640 x 480
Table 2-1. Timing Chart
Mode
Timing
2 Product Specifications
2-4 DP15H*/DP17L*
Memo
4-1-1 Before Making Adjustments
4-1-1 (a) ORIENTATIONWhen servicing, always face the monitor to theeast.
4-1-1 (b) MAGNETIC FIELDSWhenever possible, use magnetic field isolationequipment such as a Helmholtz field to surroundthe monitor. If a Helmholtz field is not available,frequently degauss the unit under test.
Caution: Other electrical equipment may causeexternal magnetic fields which mayinterfere with monitor performance.
Use an external degaussing coil to limit magneticbuild up on the monitor. If an external degaussingcoil is not available, use the internal degaussingcircuit. However, do not use the internaldegaussing circuit more than once per 30 minutes.
4-1-1 (c) WARM-UP TIMEThe monitor must be on for 30 minutes beforestarting alignment. Warm-up time is especiallycritical in color temperature and white balanceadjustments.
4-1-1 (d) SIGNALAnalog, 0.7 Vp-p positive at 75 ohm, internalterminationSync: Separate (TTL level negative/positive)
4-1-1 (e) SCANNING FREQUENCYHorizontal: 30 kHz to 70 kHz (Automatic)Vertical: 50 Hz to 160 Hz (Automatic)Unless otherwise specified, adjust at the 17Ó: 1024 x 768 mode (68 kHz/85 Hz), 15Ó: 800 x 600 mode (54 kHz/85 Hz) signals. Refer to Table 2-1 on page 2-3.
.4-1-2 Required Equipment
The following equipment may be necessary foradjustment procedures:
4-1-2 (a) DISPLAY CONTROL ADJUSTMENT1. Non-metallic (Ð) screwdriver:
4-1-2 (b) COLOR ADJUSTMENTS1. All equipment listed in 4-1-2 (a), above2. Color analyzer, or any luminance
measurement equipment
DP15H*/DP17L* 4-1
4 Alignment and AdjustmentsThis section of the service manual explains how to make permanent adjustments to the monitor. Directionsare 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, thesettings are not permanently stored and may be inadvertently deleted by the user.
4-1-3 Connecting the SoftJigConnect 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 themonitor. If you use Setup 2 (PC only, nosignal generator) you can only makeadjustments to the signal timing availableon that computer system. To makecorrections to all factory timings requiresthe use of an additional signal generator.
4 Alignment and Adjustments
4-2 DP15H*/DP17L*
MONITOR
INTERFACEBOARD VER. 2.0
PCSIGNALGENERATOR
3-WIRECABLE
SIGNAL CABLE
5V DCADAPTOR
PARALLEL CABLE
Figure 4-1. Setup 1, With Signal Generator
MONITOR
INTERFACEBOARD VER. 2.0
PC
3-WIRE CABLE
SIGNAL CABLEPARALLEL CABLE
D-SUBCONNECTOR
5V DCADAPTOR
Figure 4-2. Setup 2, Without Signal Generator
4-2-1 HIGH VOLTAGE ADJUSTMENT
Signal: 1024 x 768 (68 kHz/85 Hz) (17Ó)800 x 600 (54 kHz/85 Hz) (15Ó)
25 kV ± 0.2 kV (15Ó)exception) 26.0 kV ± 0.2 kV for 17Ó SDD CRT that
the DY type is DMX-1791AT
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 thefollowing procedure.
PROCEDURE1. Turn the power off and disconnect the AC line
cord from the power source.2. Turn the power on after connecting high
voltage Probe.3. Using the jig, adjust the high voltage to the
specification.
* High Voltage Adjustment PROCEDURE using Softjig① Select matching model name in ÒModelÓ field.
➁ Select Ò @7: Zero BeamÓ in menu afterselecting ÒExtra 1Ó
➂ Adjust high voltage using control bar after selecting ÒHV MINÓ
➃ Turn the power off/on after adjustment finished.
➄ Check the high voltage has been fixed with adjusted value after reselecting Ò@7: Zero BeamÓ.
25 kV ± 0.2 kV (15Ó)Screen Voltage adjustment procedure using softjigis all the same as 4-2-1 but selecting ÒG2 CONTÓon the contrary to ÒHV MINÓ.
Table 4-1
4-2-3 CENTER RASTERAdjust SW401 so that the back raster comes to thecenter when you apply each basic mode for 15Óand 17Ó.
4-2-4 CenteringCentering means to position the center point ofthe display in the middle of the display area.Horizontal size and position and vertical size andposition control the centering of the display.
Adjust the horizontal size and vertical size to theiroptimal settings: 306 mm (H) x 230 mm (V) for17Ó, 267 mm (H) x 200 mm (V) for 15Ó.
Adjust the horizontal position and verticalposition to ² 4.0 mm of the center point of thescreen.
|A-B| ² 4.0 mm. |C-D| ² 4.0 mm.
Figure 4-3. Centering
* In Softjig window, ÒGeometryÓ has to beselected for GD adjustment.
4-2-4 (a) HORIZONTAL SIZE ADJUSTMENT
CONDITIONSScanning frequency: 68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)Display image: Crosshatch patternBrightness: MaximumContrast: Maximum
Use control bar after selecting ÒH-SIZEÓ in leftmenu to adjust the horizontal size of the displaypattern to 306 mm (17Ó) and 267 mm (15Ó).(Tolerance: ± 3 mm.)
If ÒH-SIZEÓ is not enough to adjust it, select ÒSIZE B+Ó by turns.
4-2-4 (b) VERTICAL SIZE ADJUSTMENT
CONDITIONSScanning frequency: 68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)Display image: Crosshatch patternBrightness: MaximumContrast: Maximum
Use control bar after selecting ÒV-SIZEÓ in leftmenu to adjust the vertical size of the displaypattern to 230 mm (17Ó) and 200 mm (15Ó).(Tolerance: ± 3 mm.)
Use control bar after selecting ÒV-POSITIONÓ inleft menu to center the vertical image on theraster.
4-2-5 Linearity
Linearity affects the symmetry of images as theyappear on the screen. Unless each row or columnof blocks in a crosshatch pattern is of equal size,or within the tolerances shown in Tables 4-2 and4-3, an image appears distorted, elongated orsquashed.
Table 4-2. Standard Modes Linearity: 640x480/75Hz,800x600/85Hz and 1024x768/85Hz
Table 4-3. Other Modes Linearity: VGA, SVGA, XGA, MAC, etc.
54 kHz/85 Hz (15Ó)Display image: Crosshatch patternBrightness: MaximumContrast: MaximumTo adjust the Horizontal Linearity, refer to Tables4-2 and 4-3 for the tolerance range.Increase or decrease H_LIN to optimize theimage.
4-2-5 (b) VERTICAL LINEARITY ADJUSTMENT
CONDITIONSScanning frequency: 68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)Display image: Crosshatch patternBrightness: MaximumContrast: MaximumTo adjust the Vertical Linearity, refer to Tables 4-2and 4-3 for the tolerance range.Use control bar after selecting ÒV-LINEARITYBALÓ in left menu to optimize the image.
4 Alignment and Adjustments
4-4 DP15H*/DP17L*
Figure 4-5. Pinbalance
4 : 3
5 : 4
Horizontal: 17.8~20.5
Vertical : 17.8~20.5
Horizontal: 16.7~19.2
Vertical : 17.8~20.5
Supported Timing Mode
Each block (10 %) Difference betweenadjacent blocks (5 %)
Horizontal: Less than 0.96 mm
Vertical : Less than 0.96 mm
Horizontal: Less than 0.90 mm
Vertical : Less than 0.96 mm
4 : 3
5 : 4
Horizontal: 18.2~20.1
Vertical : 18.2~20.1
Horizontal: 17.1~18.9
Vertical : 18.2~20.1
Standard Modes Linearity
Each block (10 %) Difference betweenadjacent blocks (4 %)
Horizontal: Less than 0.77 mm
Vertical : Less than 0.77 mm
Horizontal: Less than 0.72 mm
Vertical : Less than 0.77 mm
4-2-6 Trapezoid Adjustment
CONDITIONSScanning frequency: 68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)Display image: Crosshatch patternBrightness: MaximumContrast: Maximum
Use control bar after selecting ÒTRAPEZOIDÓ inleft menu to make the image area rectangular.
Figure 4-4. Trapezoid
4-2-7 Pinbalance Adjustment
CONDITIONSScanning frequency: 68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)Display image: Crosshatch patternBrightness: MaximumContrast: Maximum
Figure 4-5. Pinbalance
Use control bar after selecting ÒPINBALANCEÓ inleft menu to optimize the image.
4-2-8 Parallelogram Adjustment
CONDITIONSScanning Frequency: 68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)Display image: Crosshatch patternBrightness: MaximumContrast: Maximum
Use control bar after selecting ÒPARALLELÓ inleft menu to make the image area rectangular.
Use control bar after selecting ÒPINCUSHIONÓ inleft menu to straighten the sides of the image area.
4-2-10 Tilt Adjustment
CONDITIONSScanning Frequency: 68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)Display image: Crosshatch patternBrightness: MaximumContrast: Maximum
Use control bar after selecting ÒROTATIONÓ inleft menu to correct the tilt of the display.
4-2-11 Degauss
No adjustments are available for the degaussingcircuit. The degaussing circuit can effectivelyfunction only once per 30 minutes.
4-2-12 To Delete the User Mode Data
To delete the adjustment data from the usermodes, click Ò@4: USER DELETEÓ in right ment.
4-2-13 Save the Data
To save the adjustment data for a mode, pressÒ@3: ALL MODE SAVEÓ in right ment.
4 Alignment and Adjustments
DP15H*/DP17L* 4-5
| A - B | < 4 mm
A
4 mm
B B
A
D1 D2 D1
| C1 |, | C2 | ≤ 2.0 mm, | D1 |, | D2 | ≤ 2.0 mm.
Figure 4-7. Pincushion
C2
C1
D1 D2
CAUTION:Check below condition before coloradjustment Video signal : Analog 0.7 Vp-p (at 75 Ω)Sync : TTL level (H, V seperate signal)
* Select ÒColorÓ in Softjig menu for color adjustment.
4-3-1 Color Coordinates (Temperature)
Color temperature is a measurement of theradiant energy transmitted by a color. Forcomputer monitors, the color temperature refersto the radiant energy transmitted by white. Colorcoordinates are the X and Y coordinates on thechromaticity diagram of wavelengths for thevisible spectrum.
CONDITIONSMeasurement instrument: Color analyzerScanning frequency: 68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)Display image: White flat field at
center of display areaLuminance: Maximum
PROCEDUREUse the directions in sections 4-3-2 through 4-3-3to adjust the color coordinates for:9300K to x = 0.283 ± 0.02, y = 0.298 ± 0.026500K to x = 0.313 ± 0.02, y = 0.329 ± 0.02
4-3-2 Color Adjustments for 9300K
4-3-2 (a) BACK RASTER COLOR ADJUSTMENT
CONDITIONSScanning frequency: 68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)Display image: Back raster patternBrightness: MaximumContrast: Maximum
1. Select Ò@1: CHANNEL 1Ó in right menu tocontrol the color for 9300K.
2. Adjust the luminance of the back raster tobetween 0.5 to 0.7 ft-L using contron bar afterselecting ÒGREEN CUTOFFÓ in the menu.
3. Use control bar after selecting ÒBLUECUTOFFÓ in left menu to set the ÒyÓcoordinate to 0.298 ± 0.02.
4. Use control bar after selecting ÒREDCUTOFFÓ in left menu to 0.283 ± 0.02.
* If color values would not be matched desirable values, repeat sequence 3 and 4 after readjustingÒGREEN CUTOFFÓ control a little different.
4-3-2 (b) WHITE BALANCE ADJUSTMENTCONDITIONSScanning frequency: 68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)Display image: White box patternBrightness: 0.06ft-L at Back Raster
Pattern DisplayContrast: Maximum
Figure 4-8. White Box Pattern
1. Use control bar after selecting ÒRED GAINÓ,ÒGREEN GAINÓ and ÒBLUE GAINÓ to adjustthe luminance to 45 ft-L (15Ó) and 46 ft-L(17Ó) with the color coordinates ranged for9300K to x = 0.283 ± 0.02, y = 0.298 ± 0.02. exception) 17Ó SDD CRT type-named(*/S-2) : 42ft-L.
4-3-2 (c) ABL ADJUSTMENT
CONDITIONSScanning frequency: 68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)Display image: Full white patternBrightness: MaximumContrast: Maximum
Figure 4-9. Full White Pattern
1. Check the ABL. If it is not within thespecifications, use the ABL controls to adjustit. (15Ó: 33 ± 1 ft-L, 17Ó: 36 ± 1 ft-L )
2. Select Ò@4: COLOR SAVEÓ to save the data.3. Select Ò@6: ALL COLOR SAVEÓ to save the
CH2.
4 Alignment and Adjustments
4-6 DP15H*/DP17L*
4-3 Color Adjustments
1/3H-1/2H
1/3V-1/2V
FRONT BEZEL OPENING
BACK RASTER
WHITE WINDOW
FRONT BEZEL OPENING
BACK RASTER
WHITE WINDOW
4-3-2 (d) WHITE BALANCE ADJUSTMENT VERIFICATION
CONDITIONSScanning frequency: 68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)Display image: Back raster pattern
Full White PatternX-Y Coordinates: x = 0.283 ± 0.02,
y = 0.298 ± 0.02ABL Luminance Refer to 4-3-2(c)Brightness: MaximumContrast: 5 ft-L, 24 ft-L
1. Check whether the color coordinates of theback raster satisfy the above spec.If they do not, return to 4-3-2 (a) and readjustall settings.
2. Display a full white pattern.
3. Select ÒGeometryÓ in softjig menu.4. Select Ò@7: 5-ft Ò in right menu.5. Check whether the white coordinates of the
video meet the above coordinates spec.6. Select Ò@8: 24-ft Ò 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 readjustall settings.
Select ÒColorÓ and click Ò@2: CHANNEL 2Ófor color ajdustment for 6500KRepeat the sequence of 9300K adjustment.The luminance values the same as 9300K, butthe color coordinated of back raster and whitebox are : x = 0.313 ± 0.02 y = 0.329 ± 0.02
4-3-3 Luminance Uniformity Check
Luminance is considered uniform only if the ratioof lowest to highest brightness areas on the screenis not less than 7.5:10.
CONDITIONSScanning frequency: 68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)(1024 x 768)
Display image: White flat fieldBrightness: Cut off point at 24 ft-LContrast: Maximum
PROCEDUREMeasure luminance at nine points on the displayscreen (see figure below).
4-3-4 Focus Adjustment
CONDITIONSScanning frequency: 68 kHz/85 Hz (17Ó)
54 kHz/85 Hz (15Ó)(1024 x 768)
Display image: ÒHÓ character patternBrightness: Cut off pointContrast: Maximum
PROCEDURE1. 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 AdjustmentColor purity is the absence of undesired color.Conspicuous mislanding (unexpected color in auniform field) within the display area shall not bevisible at a distance of 50 cm from the CRTsurface.
54 kHz/85 Hz (15Ó)Display image: White flat fieldLuminance: Cut off point at the center
of the display area
Note: Color purity adjustments should only beattempted by qualified personnel.
4 Alignment and Adjustments
DP15H*/DP17L* 4-7
Figure 4-10. Luminance Uniformity Check Locations
PROCEDUREFor trained and experienced service techniciansonly.
Use the following procedure to correct minorcolor purity problems:
1. Make sure the display is not affected byexternal magnetic fields.
2. Very carefully break the glue seal between the2-pole purity convergence magnets (PCM), theband and the spacer (see Figures 4-12).
3. Make sure the spacing between the PCMassembly and the CRT stem is 29 mm ± 1 mm.
4. Display a green pattern over the entire displayarea.
5. Adjust the purity magnet rings on the PCMassembly 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 andthen again, using a blue pattern.
Table 4-4. 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 theirmovement during shipping.
4 Alignment and Adjustments
4-8 DP15H*/DP17L*
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
DP15H*/DP17L* 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.• High voltage develops but no raster appears: Video output circuits.• High voltage does not develop: Horizontal output circuits.
5-1-1 No Power Supply
Chirping noise exists? Check and replace IC601.
Check and replace D601, FH1
Done.
No
Yes
Repeating start? Check and replace D606.
No
Yes
IC601 Pin 1 waveform is right? Check and replace D614, IC601,Q602, ZD601.
Yes
No
C622 Voltage is 13 V ± 0.5V? Check and replace IC201, IC301,IC401, Q402, Q404.
Yes
No
Normal operation Replace Main board.
Yes
Verify voltages.
Yes
No
WAVEFORMS
1
1 100 V (IC601, #1)
CH1 P-P = 100 V CH1 RMS = 350.2 V
5 Troubleshooting
5-2 DP15H*/DP17L*
5-1-2 DPMS Failure
Make No H/V sync (power offmode)
Check signal source H/V sync video level.
LED blinks Check IC201 Pin 40.
Yes
No
+12 V line off Check IC201 Pin 5.
Yes
No
IC602 Pin 4 voltage exists?
Check IC201 Pin 6.Check and replace IC602.
No
Yes
IC601 Pin 1 outputvoltage exists? Refer to 5-1-1 No Power Supply.
Done
Yes
No
WAVEFORMS
2
2 100V (IC601, #1)
CH1 P-P = 100V CH1 RMS = 325.8 V
5 Troubleshooting
DP15H*/DP17L* 5-3
5-1-3 H_Deflection Failure
Does Horizontal paluse signalappear at at Pin 8 of IC401? Check IC401.
Yes
No
Does 110 Vp-p signal appear at Collector of Q403? Check Q443.
No
No
Check Q402, Q404, T401.
WAVEFORMS
4
3 2.00 V (IC401, #6)
CH1 P-P = 2.00V CH1 RMS = 5.868V
4 1.00V (IC401, #8)
CH1 P-P = 1.00V CH1 RMS = 1.298V
5 20.0 V (Q403, Collector)
CH1 P-P = 20.0 V CH1 RMS = 46.80V
Does PWM output signal appear at Pin 6 (H_out) of IC401?
Check IC401.
Check 12 V line.
Yes
No Does DC 12V appear at Pin 10 of IC401?
Yes
No3
7-1-4 S Correction Failure
S1~S3 signals are right at eachfrequency block?
Check S1 ~ S3 signal.
Check and replace Q404, Q409, Q410,Q414, Q415, Q416
Yes
Check and replace IC201.No
5
5 Troubleshooting
5-4 DP15H*/DP17L*
5-1-5 H_Lin. Failure
IC201 Pin 21 voltage varies withdifferent H_Lin. DAC values?
IC603 Pin 9 voltage varies withdifferent H_Lin. DAC values?
Check +12 V, –10 V line.Check some parts around IC603.
Check Q412, Q413, T402.
Yes
Yes
No
Replace IC201.No
5-1-6 Invariable H_Size
IC401 Pin 6 voltage varies withdifferent B_Out DAC values?