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TFT-LCD MONITOR
Chassis Model
MJ15AS* 510N
MJ15BS* 510T
MJ17AS* 710N
MJ17BS* 710T
MJ19AS* 910N
MJ19BS* 910T
Manual
SERVICE
TFT-LCD MONITOR CONTENTS
1. Precautions
2. Product Specifications
3. Disassembly & Reassembly
4. Alignments & Adjustments
5. Troubleshooting
6. Exploded View & Parts List
Simple Stand
7. Electrical Parts List
8. Block Diagram
9. Wiring Diagram
10. PCB Layout
11. Schematic Diagrams
12. Panel Description
Pivot Stand
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Samsung Electronics Co.,Ltd. ❈ This Service Manual is a property of Samsung 416, Maetan-3Dong, Yeongtong-Gu, Suwon City, Kyungki-Do, Korea,443-742 Electronics Co., Ltd. Printed in Korea Any unauthorized use of Manual can be punished P/N : BN82-00087S-00 under applicable International and/or domestic law. http://itself.sec.samsung.co.kr
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1 Precautions Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as electrical shock. 1-1 Safety Precautions 1-1-1 Warnings 1. For continued safety, do not attempt to modify the (READING SHOULD NOT BE ABOVE 0.5mA) circuit board. 2. Disconnect the AC power and DC power jack before servicing. LEAKAGE DEVICE CURRENT UNDER TESTER TEST 1-1-2 Servicing the LCD Monitor TEST ALL EXPOSED METAL SURFACES 1. When servicing the LCD Monitor,
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1 Precautions 1-2 Servicing Precautions WARNING: An electrolytic capacitor installed with the wrong polarity might explode. Caution: Before servicing units covered by this service manual, read and follow the Safety Precautions section of this manual. Note: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions, always follow the safety precautions. 1-2-1 General Servicing Precautions 1. Always unplug the unit’s AC power cord fr
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2 Product Specifications 2-1 MJ15AS*/MJ15BS*/MJ17AS*/MJ17BS* Specifications Description Item MJ15AS*/MJ15BS* MJ17AS*/MJ17BS* LCD Panel TFT-LCD panel, RGB vertical stripe, normally black transmissive, TFT-LCD panel, RGB vertical stripe, normally black transmissive, 15-Inch viewable, 0.297 (H) x 0.297 (V) mm pixel pitch 17-Inch viewable, 0.264 (H) x 0.264 (V) mm pixel pitch Scanning Frequency Horizontal : 31 kHz ~ 61 kHz (Automatic) Horizontal : 30 kHz ~ 81 kHz (Automatic) Vertical : 50 Hz ~ 75
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2 Product Specifications 2-2 MJ19AS*/MJ19BS* Specifications Description Item LCD Panel TFT-LCD panel, RGB vertical stripe, normally black transmissive, 19-Inch viewable, 0.297 (H) x 0.297 (V) mm pixel pitch Scanning Frequency Horizontal : 31 kHz ~ 61 kHz (Automatic) Vertical : 55 Hz ~ 76 Hz Display Colors 16.2 Million colors Maximum Resolution Horizontal : 1280 Pixels Vertical : 1024 Pixels Input Video Signal Analog, 0.7 Vp-p ± 5% positive at 75 Ω , internally terminated Input Sync Signal
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2 Product Specifications 2-3 Pin Assignments Sync 15-Pin D-Sub Signal Cable Connector Type Separate Composite Sync-on-green Pin No. 1 Red Red Red 2 Green Green Green + H/V Sync. 3 Blue Blue Blue 4 GND GND GND 5 DDC Return (GND) DDC Return (GND) DDC Return (GND) 6 GND-R GND-R GND-R 7 GND-G GND-G GND-G 8 GND-B GND-B GND-B 9 DDC Power Input (+5V) DDC Power Input (+5V) DDC Power Input (+5V) 10 Self Raster Self Raster Self Raster 11 GND GND GND 12 Bi-Dr Data (SDA) Bi-Dr Data (SDA) Bi-Dr Data (SDA) 13
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2 Product Specifications 2-4 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 VESA VESA(MJ17AS*/MJ17BS*/ IBM Mode (MJ15AS*/MJ15BS*/MJ17AS*/MJ17BS*/MJ19AS*/MJ19BS*) MJ19AS*/MJ19BS*) VGA2/ VGA3/ 640/75 Hz 800/60 Hz 800/75 Hz 1024/60 Hz 1024/75 Hz 1280/60 Hz 1280/75 Hz 70 Hz 60 Hz 640 x 480 800 x 600 800 x 600 1024 x 768 1024 x 768 1280 x 1024 1280 x 1024 720 x 400 640
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3 Disassembly and Reassembly This section of the service manual describes the disassembly and reassembly procedures for the MJ15AS*/MJ17AS*/MJ19AS*/MJ15BS*/MJ17BS*/MJ19BS* TFT-LCD 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 any metal instrument except provided jig to separate the
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3 Disassembly and Reassembly 6. Remove 7 screws, 4 hexa screws from the boards and lift up the boards. ! Caution : When repairing panel only, disconnect just LVDS cable, Panel-Lamp / Wire marked in circle in the picture without removing the screws on board in order to lift the board up. 7. This picture is panel. 3-2 Reassembly Reassembly procedures are in the reverse order of disassembly procedures. 3-2 MJ15AS*/MJ17AS*/MJ19AS*/ MJ15BS*/MJ17BS*/MJ19BS*
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4 Alignments and Adjustments This section of the service manual explains how to use the RS232 JIG. This function is needed for AD board change and program memory (IC110) change. 4-1 Required Equipment The following equipment is necessary for adjusting the monitor: • Computer with Windows 95, Windows 98, or Windows NT. • MTI-2031 DDC MANAGER JIG 4-2 Automatic Color Adjustment To input video, use 16 gray or any pattern using black and white. 1. Select english for OSD language. 2. Press the “ (Ent
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4 Alignments and Adjustments 4-6 Service Function Spec. 4-6-1 How to Display Service Function OSD 1. The value for brightness and contrast should be changed to zero. 2. Within 5 seconds, press the (Enter/Source) key. 3. Service function OSD will be displayed. ❇ If you want to disable the service function OSD, you will have to power off. Panel Information Softward Version Checksum Figure 2. The example of service function OSD The service function OSD is based on a grid of 29 columns x 12 rows
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4 Alignments and Adjustments 4-6-3 How to Control Service Function OSD •After change the panel or lamp, you must reset service function OSD. •The case of panel change After changeing the panel, press the menu key within 5 seconds,. Then, panel Ch. No increases one step and the panel time information is reset to zero. Simultaneously, other information is reset to zero (Upper/Lower lamp, Panel cycle). Figure 4. 4-6-4 How to Control Service Function OSD •In the case of Upper Lamp or Lower Lamp chan
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4 Alignments and Adjustments Memo 4-4 MJ15AS*/MJ17AS*/MJ19AS*/ MJ15BS*/MJ17BS*/MJ19BS*
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5 Troubleshooting Notes: 1. Before troubleshooting, setup the PC’s display as below. • Resolution: 1024 x 768 • H-frequency: 61 kHz • V-frequency: 75 Hz 2. If no picture appears, make sure the power cord is correctly connected. 3. Check the following circuits. • No raster appears: Function PBA, Main PBA, I/D PBA • 5V develop but no screen: Main PBA • 5V does not develop: I/D PBA 4. If you push and hold the “ (Enter, Source)” button for more than 5 seconds, the monitor automatically returns
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5 Troubleshooting Notes: 1. Before troubleshooting, setup the PC’s display as below. • Resolution: 1280 x 1024 • H-frequency: 64 kHz • V-frequency: 60 Hz 2. If no picture appears, make sure the power cord is correctly connected. 3. Check the following circuits. • No raster appears: Function PBA, Main PBA, I/P PBA • 5V develop but no screen: Main PBA • 5V does not develop: I/P PBA 4. If you push and hold the “ (Enter/Source)” button for more than 5 seconds, the monitor automatically returns to
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5 Troubleshooting 5-2-1 No Video (ANALOG) Check signal cable connection and power. No Replace or check related circuit. 1 X400 oscillate properly? Yes No Is there R, G, B input at R100, Check input part. R101 and R103? Yes Is there Hsync, Vsync waveform No 2 3 Check IC400 and related circuit. at Pin 100, 1 of IC 400? Yes Is there Hsync, Vsync waveform No 3 2 Check IC200 and related circuit. at Pin 43, 44 of IC 200? Yes No Does the output signal appear Check IC400 and related circuit. at Pin 17~2
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5 Troubleshooting WAVEFORMS 2 1 3 5-4 MJ15AS*/MJ17AS*/MJ19AS*/ MJ15BS*/MJ17BS*/MJ19BS*
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5 Troubleshooting 5-2-2 No Video (DIGITAL) Check signal cable connection and power. No Replace or check related circuit. 1 X400 oscillate properly? Yes Is there R, G, B input at No 6 Check input part. 4 5 R110, R112, R114, R111, R113 and R115? Yes Is there waveform No 7 Check input part. at R11, R117? Yes No Does the output signal appear Check IC400 and related circuit. at Pin 17~20, 22~27 of CN400? Yes No There are DC 5V at Pin 1, 2 Check the panel EN signal at R222 and 3 of CN400? and BLEL s
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5 Troubleshooting WAVEFORMS 2 1 3 4 5 6 7 5-6 MJ15AS*/MJ17AS*/MJ19AS*/ MJ15BS*/MJ17BS*/MJ19BS*
