TFT-LCD MONITOR GH15LS GH15ES GH15MS SERVICE Manual TFT-LCD MONITOR CONTENTS 1. Precautions 2. Product Specifications 3. Disassembly & Reassembly 4. Troubleshooting 5. Exploded View & Parts List GH15LS/GH15ES 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. (READING SHOULD NOT BE ABOVE 0.5mA) When the chassis is operating, semiconductor heatsinks are potential shock hazards.
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 Description Item GH15LS/GH15ES GH15MS LCD Panel TFT-LCD panel, RGB vertical stripe, normaly white, 15-Inch viewable, 0.297 (H) pixel pitch Scanning Frequency Horizontal : 30 kHz ~ 61 kHz (Referring ~ Timing chart, Page 2-3, 2-4) Vertical : 50 Hz ~ 75 Hz (Referring ~ Timing chart, Page 2-3, 2-4) Display Colors 16,003,008 colors Maximum Resolution Horizontal : 1024 Pixels Input Video Signal Analog, 0.
2 Product Specifications 2-2 Pin Assignments Sync Type Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 2-2 15-Pin Signal Cable Connector Separate Red Green Blue GND GND (DDC Return) GND-R GND-G GND-B No Connection GND-Sync./Self Test GND DDC Data H-Sync. V-Sync. DDC Clock Composite Red Green Blue GND GND (DDC Return) GND-R GND-G GND-B No Connection GND-Sync./Self Test GND DDC Data H/V-Sync. Not Used DDC Clock Sync-on-green Red Green + H/V Sync. Blue GND GND (DDC Return) GND-R GND-G GND-B Not Used GND-Sync.
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 VGA1/70 Hz 640 x 350 VGA2/70 Hz 720 x 400 VGA3/60 Hz 640 x 480 640/72 Hz 640 x 480 640/75 Hz 640 x 480 800/56 Hz 800 x 600 800/60 Hz 800 x 600 fH (kHz) 31.469 31.469 31.469 37.861 37.500 35.156 37.879 A µsec 31.778 31.777 31.778 26.413 26.667 28.444 26.
2 Product Specifications Table 2-1. Timing Chart (Continued) Mode MAC. VESA 800/72 Hz 800 x 600 800/75 Hz 800 x 600 1024/60Hz 1024x768 1024/70Hz 1024x768 1024/75Hz 1024x768 640/67 Hz 640 x 480 832/75 Hz 832 x 624 fH (kHz) 48.077 46.875 48.363 56.476 60.023 35.000 49.726 A µsec 20.800 21.333 20.677 17.707 16.660 28.571 20.110 B µsec 2.400 1.616 2.092 1.813 1.219 2.116 1.117 C µsec 1.280 3.232 2.462 1.920 2.235 3.175 3.910 D µsec 16.000 16.162 15.754 13.653 13.
3 Disassembly and Reassembly This section of the service manual describes the disassembly and reassembly procedures for the GH15LS/GH15ES/GH15MS 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 Disassembly and Reassembly 3-2 Replacement Order of Lamp Assemblies (GH15LS/GH15ES/GH15MS : 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 GH15LS/GH15ES/GH15MS
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: Audio PCB, SMPS PCB, Main PCB • 12V develop but no screen: Main PCB • 12V does not develop: Audio PCB, SMPS PCB 4.
4 Troubleshooting 4-2 No Video 1 Does the H-sync pulse appear at Pin 9 of IC108? No Check CN102. Yes 4 Does the H-sync pulse appear at Pin 150 of IC105? No Replace IC108 or check its related circuit. Yes 2 Does the V-sync pulse appeaer at Pin 30 of IC301? No check CN102. Yes 3 Does the V-sync pulse appeaer at Pin 148 of IC105? No Replace IC301 or check its related circuit. No Replace IC105 or check its related circuit.
4 Troubleshooting WAVEFORMS 1 5 2 6 3 7 4 GH15LS/GH15ES/GH15MS 4-3
4 Troubleshooting 4-3 User Controls Don’t Work Does the DC level change at Pin 35 and 36 of IC301 when you push the front panel button? No Check the buttons. (SW801~SW808) Yes Refer to 4-4 No OSD Display. 4-4 No OSD There is video but no OSD. 5 While pushing a front control button does any pulse appear at Pin 46,47 and 55, 56 and 63,64 of IC105? Yes No 1 3 2 No Do sync signals appear at Pin 44, 150 and 43 of IC105? Yes Replace IC105. Replace IC105 or check its related circuit.
4 Troubleshooting 4-5 No SOUND (GH15MS) Does the DC 12V appear at Pin 15, 16 of IC401 and Pin 5, 6, 7, 8 of Q403? No Check Q403, Q401 and related circuit. Yes Does the sound input signal appear at Pin 4 and 9 of IC401? No Check CN401 and related circuit. Yes Does the sound signal appear at Pin 14 and 17 of IC401? No Check IC401 and related circuit. Yes Check CN402 outputs.
4 Troubleshooting 4-6 Microphones Don’t Work Does the PC’s sound program operate well? No Check the PC’s sound program and compatibility. No Connect the cable between the PC and monitor. No Check the connection between CN808 on the Audio PCB and the Internal Microphone. Yes Is the connection between the PC and monitor secure? Yes Is the Internal Microphone connector attached? Yes Does the Internal Microphone work? No Check Q801 and related circuits.
5 Exploded View and Parts List 5-1 GH15LS/GH15ES GH15LS/GH15ES/GH15MS 5-1
5 Exploded View & Parts List 5-2 GH15MS 5-2 GH15LS/GH15ES/GH15MS
6 Electrical Parts List 6-1 Main PCB Parts Loc. No. CIS CIS CIS CIS CIS CN101 CN102 IC301 IC301_SOCK CIS BD181 BD182 BD183 BD201 BD205 BD206 BD301 BD302 BD303 BD304 C101 C102 C103 C104 C105 C106 C112 C131 C132 C133 C134 C135 C136 C137 C138 C139 C140 C141 C142 C143 C144 C145 C146 C147 C148 C149 C150 C151 C152 C153 C154 C155 C156 C157 C159 C160 C161 C162 C163 C164 C165 Code No.
6 Electrical Parts List Loc. No. C166 C167 C168 C169 C170 C171 C172 C173 C187 C188 C189 C211 C215 C216 C217 C223 C227 C228 C229 C230 C232 C301 C302 C303 C304 C311 C312 C313 C371 C372 C373 C374 C375 CN201 CN301 CN302 D131 D132 D133 D301 D302 FT110 FT111 FT112 FT113 FT114 FT901 FT902 FT903 FT904 FT905 FT906 IC102 IC105 IC108 IC251 IC371 IC372 MP1.0 Q102 Q103 6-2 Code No.
6 Electrical Parts List Loc. No. Q104 Q105 Q106 Q107 Q311 Q312 R102 R104 R106 R107 R108 R109 R110 R113 R114 R115 R117 R118 R119 R120 R121 R122 R123 R124 R125 R185 R186 R187 R188 R189 R190 R203 R204 R205 R207 R301 R314 R316 R317 R320 R321 R322 R323 R324 R325 R326 R327 R329 R330 R334 R335 R336 R337 R338 R339 R340 R341 R343 R344 R345 R346 Code No.
6 Electrical Parts List Loc. No. R347 R348 R349 R350 R351 R362 R371 R372 R373 R374 R375 R376 R377 R378 R381 R901 R902 R903 R904 R905 R910 R911 R912 R913 R918 R919 R973 R974 R975 R976 RA130 RA131 RA132 RA133 RA134 RA136 RA137 RC201 RC202 RC203 RC204 RC205 RC206 RC207 X100 X311 ZD181 ZD182 ZD183 ZD184 ZD185 6-4 Code No.
6 Electrical Parts List 6-2 Others Loc. No. Code No. Description Specification Remarks - BN95-00225A BN95-00234A BN95-00254A ASSY MANUAL ASSY MANUAL ASSY MANUAL GH15LS,-,-,GH15MS,-,-,GH15ES,-,-,- GH15LS GH5MS GH15ES CIS CIS CIS M/PCB+PAN IN/PCB+M/PCB CIS - BN07-00026A BN44-00056A BN44-00053A BN39-00036A BN39-00161A BN39-00114A BN59-00167A LCD INVERTER ADAPTOR CBF-HARNESS CBF HARNESS CBF SIGNAL PBA SUB-FUNCTION LTM150XH-L01,CZB,8BIT,331.6*254.76*12.5,16.19M,-,0.297*0.
6 Electrical Parts List 6-3-2 Different Part List (GH15MS) Location C190 C191 C192 C193 C194 C401 C402 C403 C404 C405 C406 C407 C408 C409 C410 C412 C416 C420 CN401 CN402 FT401 FT402 IC109 IC401 Q401 Q403 R192 R193 R195 R361 R380 R401 R402 R403 R404 R405 R406 R412 R413 R414 ZD401 ZD402 6-6 Code 2203-000236 2402-000108 2203-000257 2203-005005 2203-000257 2203-005015 2203-005015 2203-000236 2203-000236 2402-000168 2402-000108 2203-005005 2203-005005 2402-000168 2401-001363 2401-001363 2402-000179 2402-00014
7 Block Diagram GH15LS/GH15ES/GH15MS 7-1
7 Block Diagrams Memo 7-2 GH15LS/GH15ES/GH15MS
8 Wiring Diagram GH15LS/GH15ES/GH15MS 8-1
8 Wiring Diagram Memo 8-2 GH15LS/GH15ES/GH15MS
9 Schematic Diagrams 9-1 Main Part Schematic diagram (GH15LS/GH15ES/GH15MS) 7 +3.3V_S For Japanese OSD 1.5uH 1.
9 Schematic Diagrams 1 2 3 5 6 7 9-2 4 GH15LS/GH15ES/GH15MS
9 Schematic Diagrams 9-2 Audio Part Schematic diagram (GH15MS only) +12V_IN VCC +12V_AUDIO Q403 SI4435DY U28 1 U41 FT401 A 1 R415 100K 1/16W 1 U17 BLM41P600S 1 R412 100K TP22 1/16W FT402 2 R413 100K 1/16W SW_REG_EN A U50 1 1 R417 10K 1 B 1 BLM41P600S R416 100 AUDIO_STANDBY C B E Q402 2SC2412K-Q 1 U23 U18 U19 1 U40 5 6 7 8 1 D1 D2 D3 D4 B S1 S2 S3 G1 2 1 2 3 4 C420 33uF AGND U27 BL_EN U25 1 1 R414 10K C B E Q401 2SC2412K-Q +12V_AUDIO C407 100nF 16V C408
9 Schematic Diagrams Memo 9-4 GH15LS/GH15ES/GH15MS
Samsung Electronics Co.,Ltd. 416, Maetan-3Dong, Paldal-Gu, Suwon City, Kyungki-Do, Korea. Printed in Korea P/N : BN68-00225A-00 http://www.samsungmonitor.com (SyncMaster Worldwide) http://www.samsung-monitor.com (SyncMaster USA) http://www.sec.co.