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CONFIDENTIAL
TFT-LCD MONITOR
Chassis Model
ES15U* LTM1555(B)
ES17U* LTM1755(B)
Manual
SERVICE
TFT-LCD 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
11. Panel Description
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Samsung Electronics Co.,Ltd. 416, Maetan-3Dong, Paldal-Gu, Suwon City, Kyungki-Do, Korea. Printed in Korea P/N : BN82-00071A-00 http://www.samsungmonitor.com (SyncMaster Worldwide) http://www.samsung-monitor.com (SyncMaster USA) http://www.sec.co.kr/monitor (Korea)
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CONFIDENTIAL 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
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1 Precautions CONFIDENTIAL 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
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CONFIDENTIAL 2 Product Specifications 2-1 Specifications Description Item LTM1555(B) LTM1755(B) LCD Panel TFT-LCD panel, RGB vertical stripe, normaly TFT-LCD panel, RGB vertical stripe, normaly white, 15-Inch viewable, 0.297 mm pixel pitch white, 17-Inch viewable, 0.264 mm pixel pitch Scanning Frequency Horizontal : 30 KHz ~ 69 KHz (Automatic) 30 KHz ~ 81 KHz (Automatic) Vertical : 56 Hz ~ 75 Hz (Automatic) 56 Hz ~ 75 Hz (Automatic) Display Colors 16.7 Million colors Maximum Resolution H
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2 Product Specifications CONFIDENTIAL 2-2 Pin Assignments Sync Type Separate H/V Composite H/V 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 GND (DDC Return) GND (DDC Return) GND (DDC Return) 6 GND-Red GND-Red GND-Red 7 GND-Green GND-Green GND-Green 8 GND-Blue GND-Blue GND-Blue 9 No Connection No Connection Not Used 10 GND-Sync./Self Test GND-Sync./Self Test GND-Sync./Self Test 11 GND GND GND 12 DDC Data DDC Data DDC Data 13 Horizontal sync.
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2 Product Specifications CONFIDENTIAL 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/ VGA3/ 640/75 Hz 640/85 Hz 800/75 Hz 800/85 Hz 1024/60Hz 1024/75Hz 1024/85Hz 1280/76Hz 1280/75Hz 70 Hz 60 Hz 640 x 480 640 x 480 800 x 600 800 x 600 1024 x 768 1024 x 768 1024x768 1280x1024 1280x1024 720 x 400 640 x 480 Timing (17” Only) (17” Only) fH (KHz) 3
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2 Product Specifications CONFIDENTIAL Memo 2-4 LTM1555(B)/LTM1755(B)
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CONFIDENTIAL 3 Disassembly and Reassembly This section of the service manual describes the disassembly and reassembly procedures for the LTM1555(B)/LTM1755(B) monitor. 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. 1. Remove the 4 screws (Rear Cover
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3 Disassembly and Reassembly CONFIDENTIAL 4. Lift up the rear cover until it opens completely. 3-2 Reassembly Reassembly procedures are in the reverse order of dissasembly procedures. 3-2 LTM1555(B)/LTM1755(B)
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CONFIDENTIAL 4 Alignments and Adjustments 4-1 General Alignment Instruction 1. Usually, a color TV-VCR needs only slight touch-up adjustment upon installation. Check the basic characteristics such as height, horizontal and vertical sync. 2. Use the specified test equipment or its equivalent. 3. Correct impedance matching is essential. 4. Avoid overload. Excessive signal from a sweep generator might overload the front-end of the TV. When inserting signal markers, do not allow the marker generat
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4 Alignments and Adjustments CONFIDENTIAL 4-2 Adjustment Instruction 4-2-1 Service Mode Screen 1. Auto Color PC white balance TV auto color 2. Options Add AFN : No Bus stop : No EEPROM clear 3. Reset 4-2-2 Service function 1. EEPROM Clear : Initially executed when replacing OTP. 2. TV Auto Color : Used to adjust TV image color. 3. Reset : Used after all adjustments. 4. Other functions shown are not service related. 4-2-3 Adjustment Sequence for ROM change only EEPROM Clear TV auto color PC auto
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CONFIDENTIAL 5 Troubleshooting 5-1 No Power No Does proper DC 14 V appear at Check SMPS PCB and Adapter. DC jack connected to CN12? Yes No Does proper DC 5 V appear at Check IC11. Pin 2 of IC11? Yes No Does proper DC 14V appear at Check IC11. Pin 1 of IC11? Yes No Does proper DC 3.3 V appear at Check IC14. Pin 3 of IC14? Yes No Does proper DC 2.5 V appear at Check IC109 and IC17. Pin 4 of IC109 and IC17? Yes Check IC23. LTM1555(B)/LTM1755(B) 5-1
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5 Troubleshooting CONFIDENTIAL 5-2 No Video (PC Signal) Power indicator is green. Yes Does the signal appear No at IC134, IC135, IC136 Check CN11. of R, G, B input? Yes No Does the clock pulse Check X21 and related circuit of X21. appear at X21? Yes Does the clock pulse appear at No output of 15” Check related circuit of IC32. 17”. Yes Does the clock pulse appear at No 15” Replace output of 15” 17”
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5 Troubleshooting CONFIDENTIAL 5-3 No Picture (TV, Video, S-Video) Check Pin 55, 56 (S-Video) No and Pin 52 (VCR) and Pin 74 Check CN41 (Tuner) and and Pin 53 (RF-CVBS) CN26 (VCR connector). of IC401 (VSP9407). Yes No Does the signal appear at Check IC401 (VSP9407) RA33, RA34, RA311, RA312? and related circuit. Yes Does signal appear at No 15” Check IC32 and related circuit . 17” of related IC32. Yes Check IC61, 62 and 15”
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5 Troubleshooting CONFIDENTIAL 5-4 No Sound Does the signal appear at Pin 67 (Tuner sound signal) and No Check CN11 (PC conector) Pin 57, 56 (PC sound) and Pin 51, 50 and CN26(VCR connector). (VCR sound) of IC53 (MSP3421G)? Yes No Does the signal appear at Pin 27, Check IC32 and related circuit. 28 of IC53 (MSP3421G)? Yes No Does the signal appear Check IC55 (Audio amp) and related circuit. at L53~L56? Yes Replace the speaker. 5-4 LTM1555(B)/LTM1755(B)
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6 Exploded View & Parts List CONFIDENTIAL 6-1-2 LTM1555(B) Front 5 9 2 5 6 5 10 7 3 8 9 5 1 10 6-2 LTM1555(B)/LTM1755(B)
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6 Exploded View & Parts List CONFIDENTIAL 6-1-3 LTM1555(B) Stand 3 2 4 5 1 7 6 6-4 LTM1555(B)/LTM1755(B)
