1 Precautions 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 For continued safety, do not attempt to modify the circuit (READING SHOULD board.
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.
2 Product Specifications 2-3 Pin Assignments Sync 15-Pin D-Sub Signal Cable Connector Type Separate Composite Sync-on-green Pin No. Green Green Green + H/V Sync. Blue Blue Blue DDC Return (GND) DDC Return (GND) DDC Return (GND) GND-R GND-R GND-R GND-G GND-G GND-G GND-B...
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*/ Mode (MJ15AS*/MJ15BS*/MJ17AS*/MJ17BS*/MJ19AS*/MJ19BS*/MJ19ES*/MJ19US*/MJ19QS*) MJ19AS*/MJ19BS*/MJ19ES*/MJ19US*/MJ19QS*) VGA2/ VGA3/ 640/75 Hz 800/60 Hz 800/75 Hz 1024/60 Hz 1024/75 Hz...
3 Disassembly and Reassembly 3 Disassembly and Reassembly This section of the service manual describes the disassembly and reassembly procedures for the MJ15AS*/MJ17AS*/MJ19AS*/MJ15BS*/MJ17BS*/MJ19BS*/MJ19ES* TFT-LCD monitors. WARNING: This monitor contains electrostatically sensitive devices. Use caution when handling these components. 3-1 Disassembly Cautions: 1.
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.
3 Disassembly and Reassembly 5. Lift up the panel shield and disconnect cables. 6. Remove 5 screws, 2 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.
4 Alignments and Adjustments 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: •...
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.
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).
5 Troubleshooting 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.
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. •...
5 Troubleshooting 5-2-1 No Video (ANALOG) Check signal cable connection and power. X400 oscillate properly? Replace or check related circuit. Is there R, G, B input at Check input part. R100, R101 and R103? Is there Hsync, Vsync waveform Check IC400 and related circuit. at Pin 100, 1 of IC 400? Is there Hsync, Vsync waveform Check IC200 and related circuit.
5 Troubleshooting 5-2-2 No Video (DIGITAL) Check signal cable connection and power. Replace or check related circuit. X400 oscillate properly? Is there R, G, B input at Check input part. R110, R112, R114, R111, R113 and R115? Is there waveform Check input part.
7 Electrical Parts List 7 Electrical Parts List -You can search for updated part codes through ITSELF web site. URL : http://itself.sec.samsung.co.kr/ 7-1 LS19MJAKSZ/EDC Parts list Level Loc. No. Code No. Description & Specification SA/SNA LS19MJAKSZ/EDC 920N,SGM2/S19A6-LMJ,19,LCD-MO,NETHERLAND M0216 BN90-00486H ASSY STAND;MJ19BS/AS S.N.A...
11 Schematic Diagrams 11 Schematic Diagrams This Document can not be used without Samsung’s authorization. +5V_IN VCC_MCU +5V_IN +5V_IN VCC_MCU Vcc_PANEL_IN R200 15" : +3.3V In 1/16W 17"/19" : +5V In OEM OPTION +3.3V_MAIN R201 C200 1/16W Vcc_PANEL 100nF CN400...