TFT-LCD MONITOR GH15DS SERVICE Manual TFT-LCD MONITOR CONTENTS 1. Precautions 2. Product Specifications 3. Disassembly & Reassembly 4. Troubleshooting 5. Exploded View & Parts List 6. Electrical Parts List 7. Block Diagram 8. Wiring Diagram 9. Schematic Diagrams 10.
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 circuit board. 2. Disconnect the AC power and DC Power Jack before servicing. 3. When the chassis is operating, semiconductor heatsinks are potential shock hazards. (READING SHOULD NOT BE ABOVE 0.
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. 2. 3.
2 Product Specifications 2-1 Specifications Item Description LCD Panel TFT-LCD panel, RGB vertical stripe, normaly white,15-Inch viewable, 0.297 mm pixel pitch Scanning Frequency Horizontal Vertical Display Colors 16.
2 Product Specifications 2-2 DVI Signal Pin Assignments - Main Pin Field (GH15DS) Pin 2-2 Signal Assignment Pin Signal Assignment Pin Signal Assignment 1 T.M.D.S. Data2- 9 T.M.D.S. Data1- 17 T.M.D.S. Data0- 2 T.M.D.S. Data2+ 10 T.M.D.S. Data1+ 18 T.M.D.S. Data0+ 3 T.M.D.S. Data2 Return 11 T.M.D.S. Data1 Return 19 T.M.D.S. Data0 Return 4 NC 12 NC 20 NC 5 NC 13 NC 21 NC 6 DDC Clock 14 +5V Power 22 T.M.D.S. Clock Return 7 DDC Data 15 Ground (Self-Raster) 23 T.
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. 2-3-1. GH15DS Table 2-1.
2 Product Specifications Table 2-2.
3 Disassembly and Reassembly This section of the service manual describes the disassembly and reassembly procedures for the GH15DS monitor. WARNING: This monitor contains electrostatically sensitive devices. Use with 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. 3-1-1 Removing the Stand 3-1-3 Standard Stand Disassembly 1.
3 Disassembly and Reassembly 3-2 Replacement Order of Lamp Assemblies (GH15DS : Samsung Panel) 1. After confirm there is nothing on the disk Turn the LCD module over and put it on a flat desk set to the ground. 2. Push down the stopper and slide the lamp unit. 3. Please take out the lamp unit from the LCD module.
3 Disassembly and Reassembly 4. Please fix the new lamp units on the LCD module : opposite process 2 and 3 * Replacement of lamp unit should be done at the power off state and recommanded clean bench condition. 3-3 Reassembly Reassembly procedures are in the reverse order of Disassembly procedures.
3 Disassembly and Reassembly Memo 3-4 GH15DS
4 Troubleshooting Notes: 1. Before troubleshooting, setup the PC’s display as below. • Resolution: 1024 x 768 • H-frequency: 48 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: Main PCB • 12V develop but no screen: Main PCB • 12V does not develop: Main PCB 4. If you push and hold the EXIT button for more than 5 seconds, the monitor automatically turns back to the factory preset(GH15DS).
4 Troubleshooting 4-2 Video Power indicator is green? Do the input signals appear at D201~D208? No 1 2 Yes Check X301. No Yes Check Pin 68 of IC301 and IC102. Do the input signals appear at pin 30, 31, 32 of IC401? 3 4 No Check IC301. 5 Yes Do the output signals appear at pin 40 of IC401? No Check IC401. 6 Yes Replace LCD panel.
4 Troubleshooting WAVEFORMS 1 D201 2 D208 3 IC401 #30 4 IC401 #31 5 IC401 #32 6 IC401 #40 GH15DS 4-3
4 Troubleshooting Memo 4-4 GH15DS
5 Exploded View and Parts List GH15DS 5-1
5 Exploded View & Parts List Memo 5-2 GH15DS
6 Electrical Parts List 6-1 Main PCB Part Loc. No. Code No.
6 Electrical Parts List Loc. No. C328 C329 C330 C331 C332 C333 C334 C335 C336 C402 C403 C404 C405 C413 C414 C415 C600 C601 C602 C603 C604 C605 C606 C610 C611 C612 C613 C614 CA301 CA302 CA303 CA304 CA305 CA306 CN101 CN402 CN600 D201 D202 D203 D204 D205 D206 D207 D208 D209 D210 FT301 FT302 FT303 FT402 6-2 Code No.
6 Electrical Parts List Loc. No. FT407 IC100 IC103 IC201 IC301 IC401 IC603 L100 L101 L102 L201 L303 L304 L401 L402 L602 L603 L604 L605 L606 MP1.0 Q101 Q102 Q103 Q600 Q601 Q602 Q603 Q605 Q606 R100 R101 R102 R103 R104 R105 R106 R107 R108 R109 R110 R111 R112 R113 R114 R201 R202 R203 R204 R205 R300 GH15DS Code No.
6 Electrical Parts List Loc. No. R301 R302 R303 R304 R309 R310 R311 R312 R313 R314 R315 R316 R317 R318 R322 R323 R324 R327 R329 R330 R331 R332 R401 R402 R403 R600 R601 R602 R606 R608 R609 R610 R611 R612 R613 R614 R615 R616 R618 R619 R620 R621 R622 R623 R624 R625 R626 R627 R628 R629 R630 6-4 Code No.
6 Electrical Parts List Loc. No. R631 R632 R633 R634 R635 R636 R637 R638 R639 R640 R641 R642 R866 R867 R868 RA301 RA302 RA303 RA304 RA305 RA306 X301 X601 ZD201 ZD202 ZD203 ZD204 ZD205 Code No.
6 Electrical Parts List Memo 6-6 GH15DS
7 Block Diagram GH15DS 7-1
7 Block Diagrams Memo 7-2 GH15DS
GH15DS GND Rx2– Rx2+ GND NC NC DVI_CLK DVI_DTA NC Rx1– Rx1+ GND NC 1 2 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 14 17 18 19 20 21 22 23 24 CN101 1 2 3 4 5 6 7 CN1 +12V +12V_INV GND GND GND PWR_OFF 3.3V 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 9 10 NC GND Tx3A+ Tx3AGND TxCA+ TxCAGND Tx2A+ Tx2A- NC BRT_CTL_INV NC BL_ON NC GND 11 12 13 14 15 16 17 18 19 20 7 8 9 10 11 12 +12V +12V_INV GND GND GND PWR_OFF 3.
8 Wiring Diagram Memo 8-2 GH15DS
9 Schematic Diagrams 9-1 Main Part Schematic diagram R309 22 1/16W C312 100nF 16V C313 100nF 16V C314 100nF 16V C315 100nF 16V C310 100nF 16V R303 22 1/16W R304 22 1/16W R331 0 1/16W C316 15pF 50V MO CA301 C327 100nF 16V Rx2+ Rx2- R311 R312 10 10 1/16W 1/16W 2 3 Rx1+ 1 Rx1+ Rx1+ Rx1- R313 R314 10 10 1/16W 1/16W Rx1- 1 3 Rx1 2 D204 MMBD4148SE 2 D205 MMBD4148SE 3 Rx0+ 1 Rx0+ Rx0+ Rx0RxC+ RxC- R315 R316 10 10 1/16W 1/16W R317 R318 10 10 2 D206 MMBD4148SE 1/16W 1/16W
9 Schematic Diagrams 1 D201 2 D208 5 IC401 #32 6 IC401 #40 9-2 3 IC401 #30 4 IC401 #31 GH15DS
9 Schematic Diagrams 9-2 Video Part Schematic diagram 2 1 3 TP_BRT L100 C107 100nF 1.5uH BRT_CTL_INV 5 1 BL_ON TP_BLON 1.
9 Schematic Diagrams Memo 9-4 GH15DS
Samsung Electronics Co.,Ltd. 416, Maetan-3Dong, Paldal-Gu, Suwon City, Kyungki-Do, Korea. Printed in Korea P/N : BN68-00225E-00 http://www.samsungmonitor.com (SyncMaster Worldwide) http://www.samsung-monitor.com (SyncMaster USA) http://www.sec.co.
