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COLOR MONITOR
DP15HS/HT
DP17LS/LT
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
EXIT EXIT MENU
9. Wiring Diagram
10. Schematic Diagrams
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Copyright Trademarks © 1999 by Samsung Electronics Co., Ltd. Samsung is a registered trademark and DP15H*/DP17L* and MacMaster Cable Adapter All rights reserved. are trademarks of Samsung Electronics Co., Ltd. This manual may not, in whole or in part, be Macintosh, Centris, Quadra, Duo Dock, and copied, photocopied, reproduced, translated, or Power Macintosh are trademarks of Apple converted to any electronic or machine readable Computer, Inc. form without prior written permission of Samsung Ele
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1 Precautions 1-1 Safety Precautions WARNINGS 2. Inspect all protective devices such as nonmetallic 1. For continued safety, do not attempt to modify the control knobs, insulating materials, cabinet backs, circuit board. adjustment and compartment covers or shields, isolation resistor-capacitor networks, mechanical 2. Disconnect the AC power before servicing. insulators, etc. 3. When the chassis is operating, semiconductor 3. Leakage Current Hot Check (Figure 1-1): heatsinks are potential sho
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1 Precautions 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. 1. Servicing precautions are printed on the cabinet, 5. Check the i
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2 Product Specifications 2-1 Specifications Item Description Picture Tube: 15-Inch (38 cm): 13.8-inch (35 cm) viewable, 17-Inch (43 cm): 16-inch (40.6 cm) viewable, Full-square flat-face tube, 90˚ Deflection, Semi- tint, Non-glare, Invar shadow mask, Anti-static silica coating, 0.28 mm Dot pitch Scanning Frequency Horizontal : 30 kHz to 70 kHz (Automatic) Vertical : 50 Hz to 160 Hz (Automatic) Display Colors Unlimited colors Maximum Resolution Horizontal : 1280 Dots Vertical : 1024 Lines
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2 Product Specifications 2-2 Pin Assignments Sync Type Macintosh Separate Pin No. 1 Red GND-R 2 Green Red 3 Blue H/V Sync 4 N-C Sense 0 5 DDC Return Green 6 GND-R GND-G 7 GND-G Sense 1 8 GND-B Reserved 9 N-C Blue 10 GND-Sync/Self-raster Sense 2 11 N-C GND 12 DDC Data V-Sync 13 H-Sync GND-B 14 V-Sync GND 15 DDC Clock H-Sync 5 15 Figure 2-1. Male Type Figure 2-2. Male Type 2-2 DP15H*/DP17L*
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2 Product Specifications 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. Table 2-1. Timing Chart Mode IBM VESA VGA2/70 Hz VGA3/60 Hz 640/75 Hz 640/85 Hz 800/75 Hz 800/85 Hz 1024/75 Hz 1024/85 Hz 720 x 400 640 x 480 640 x 480 640 x 480 800 x 600 800 x 600 1024 x 768 1024 x 768 Timing fH (kHz) 31.469 31.469 37.500 43.269 46.875 53.674 60.023 68.677 A µsec 31.777 31.778 26.667 23.111 21.
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2 Product Specifications Memo 2-4 DP15H*/DP17L*
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4 Alignment and Adjustments This section of the service manual explains how to make permanent adjustments to the monitor. Directions are given for adjustments using the monitor Interface Board Ver. 2.0 and software (Softjig). 4-1 Adjustment Conditions Caution: Changes made without the Softjig are saved only to the user mode settings. As such, the settings are not permanently stored and may be inadvertently deleted by the user. 4-1-1 Before Making Adjustments .4-1-2 Required Equipment The follo
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4 Alignment and Adjustments 4-1-3 Connecting the SoftJig Connect the monitor to the signal generator and/ MONITOR or PC as illustrated in Figures 4-1 and 4-2. INTERFACE BOARD VER. 2.0 Note: The signal cable connector which includes 3-WIRE CABLE the 3-wire cable must connect to the monitor. If you use Setup 2 (PC only, no 5V DC ADAPTOR signal generator) you can only make SIGNAL CABLE adjustments to the signal timing available PARALLEL CABLE on that computer system. To make D-SUB corrections to al
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4 Alignment and Adjustments 4-2 Display Control Adjustments Table 4-1 4-2-1 HIGH VOLTAGE ADJUSTMENT CRT type Screen Voltage Signal: 1024 x 768 (68 kHz/85 Hz) (17Ó) M41QAR361X11 ( ) * * 800 x 600 (54 kHz/85 Hz) (15Ó) ± M41QAQ261X11 ( ) 480V 10V * * Display image: DonÕt care M41LFQ903X28(L), etc Contrast: Minimum 17” M41EHN325X160/3F U ** Brightness: Minimum 500V ± 10V M41EHN323X160/3F U ** Limit: 26.5 kV ± 0.2 kV (17Ó) M41LLJ507XX43 (F5), (F5W3) * 630V ± 10V 25 kV ± 0.2 kV (15Ó) M41LLH507XX43 (F
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4 Alignment and Adjustments Table 4-2. Standard Modes Linearity: 640x480/75Hz, Use control bar after selecting ÒH-SIZEÓ in left 800x600/85Hz and 1024x768/85Hz menu to adjust the horizontal size of the display pattern to 306 mm (17Ó) and 267 mm (15Ó). Figure 4-5. Pinbalance (Tolerance: ± 3 mm.) Standard Modes Linearity If ÒH-SIZEÓ is not enough to adjust it, select Difference between Each block (10 %) ÒSIZE B+Ó by turns. adjacent blocks (4 %) Horizontal: 18.2~20.1 Horizontal: Less than 0.77 mm 4
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4 Alignment and Adjustments 4-2-6 Trapezoid Adjustment 4-2-9 Side Pincushion Adjustment CONDITIONS CONDITIONS Scanning frequency: 68 kHz/85 Hz (17Ó) Scanning frequency: 68 kHz/85 Hz (17Ó) 54 kHz/85 Hz (15Ó) 54 kHz/85 Hz (15Ó) Display image: Crosshatch pattern Display image: Crosshatch pattern Brightness: Maximum Use control bar after selecting ÒPINCUSHIONÓ in Contrast: Maximum left menu to straighten the sides of the image area. Use control bar after selecting ÒTRAPEZOIDÓ in | C1 |, | C2 | ≤ 2.0
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4 Alignment and Adjustments 4-3 Color Adjustments CAUTION:Check below condition before color 4-3-2 (b) WHITE BALANCE ADJUSTMENT adjustment CONDITIONS Video signal : Analog 0.7 Vp-p (at 75 Ω) Scanning frequency: 68 kHz/85 Hz (17Ó) Sync : TTL level (H, V seperate signal) 54 kHz/85 Hz (15Ó) * Select ÒColorÓ in Softjig menu for color adjustment. Display image: White box pattern Brightness: 0.06ft-L at Back Raster 4-3-1 Color Coordinates (Temperature) Pattern Display Contrast: Maximum Color tempera
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4 Alignment and Adjustments 4-3-2 (d) WHITE BALANCE ADJUSTMENT VERIFICATION PROCEDURE Measure luminance at nine points on the display CONDITIONS screen (see figure below). Scanning frequency: 68 kHz/85 Hz (17Ó) 54 kHz/85 Hz (15Ó) Display image: Back raster pattern Full White Pattern X-Y Coordinates: x = 0.283 ± 0.02, y = 0.298 ± 0.02 ABL Luminance Refer to 4-3-2(c) Brightness: Maximum Figure 4-10. Luminance Uniformity Check Locations Contrast: 5 ft-L, 24 ft-L 1. Check whether the color coordinat
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4 Alignment and Adjustments 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 (see Figures 4-12). 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
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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 WAVEFORMS Check and replace D601, FH1 1 100 V (IC601, #1) Yes Chirping noise exists? C
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5 Troubleshooting 5-1-2 DPMS Failure Check signal source WAVEFORMS H/V sync video level. 2 100V (IC601, #1) Make No H/V sync (power off mode) CH1 P-P = 100V CH1 RMS = 325.8 V No LED blinks Check IC201 Pin 40. Yes No +12 V line off Check IC201 Pin 5. Yes Yes IC602 Pin 4 Check IC201 Pin 6. voltage exists? Check and replace IC602. No No IC601 Pin 1 output 2 Refer to 5-1-1 No Power Supply. voltage exists? Yes Done 5-2 DP15H*/DP17L*
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5 Troubleshooting 5-1-3 H_Deflection Failure No No Does PWM output signal appear Does DC 12V appear at 3 Check 12 V line. at Pin 6 (H_out) of IC401? Pin 10 of IC401? Yes Yes WAVEFORMS Check IC401. 3 2.00 V (IC401, #6) No Does Horizontal paluse signal 4 Check IC401. appear at at Pin 8 of IC401? CH1 P-P = 2.00V CH1 RMS = 5.868V Yes 4 1.00V (IC401, #8) No Does 110 Vp-p signal appear 5 Check Q443. at Collector of Q403? No CH1 P-P = 1.00V CH1 RMS = 1.298V Check Q402, Q404, T401. 20.0 V (Q403, Colle
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5 Troubleshooting 5-1-5 H_Lin. Failure No IC201 Pin 21 voltage varies with Replace IC201. different H_Lin. DAC values? Yes No IC603 Pin 9 voltage varies with Check +12 V, –10 V line. different H_Lin. DAC values? Check some parts around IC603. Yes Check Q412, Q413, T402. 5-1-6 Invariable H_Size No IC401 Pin 6 voltage varies with Check and replace IC401. different B_Out DAC values? Yes No Q402 Gate output duty varies with Check some parts around Q402, different B_Out DAC values? IC401 Pin 3 ~ 6.
