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19" LCD Color Monitor
Service
Service
Service
Description
Table Of Contents...................................................1
Revision List..........................................................2
Important Safety Notice...........................................3
1. Monitor Specification..................................................4
2. LCD Monitor Description........................................5
3. Operation Instruction..................................................6
3.1. General Instructions..................................................6
3.2. Control Button....................................................6
3.3 Adjusting the Picture............................................7
4. Input/Output Specification.......................................9
4.1. Input Signal Connector.........................................9
4.2. Factory Preset Display Modes.............. .............10
4.3. Panel Specification.........................................10
5. Block Diagram............................................................12
5.1 Software Flow Chart.........................................12
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

TABLE OF CONTENTS

SAFETY NOTICE
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
Page
Description
5.2.Electrical Block Diagram........................ .......14
6. Schematic.............................................................15
6.1 Main Board..........................................................15
6.2 Power Board.................................................20
7. PCB Layout...........................................................23
7.1. Main Board.........................................................23
7.2. Power Board........................................................25
7.3. Key Board............................................................26
8. Maintainability........................................................27
8.1.Equipments and Tools Requirement......................27
8.2.Trouble Shooting.................................................29
10. Monitor Exploded View....................................36
11. BOM List...............................................................37
1
ASI DW19MBD
Horizontal Frequency
30-83 kHz
Page

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Summary of Contents for ASI DW19MBD

  • Page 1: Table Of Contents

    19" LCD Color Monitor ASI DW19MBD Service Service Service Horizontal Frequency 30-83 kHz TABLE OF CONTENTS Description Page Description Page Table Of Contents…………………………………………...1 5.2.Electrical Block Diagram…………………… ..14 Revision List………………………………………………..2 6. Schematic……………..........15 Important Safety Notice…………………………………..3 6.1 Main Board..………..........15 1. Monitor Specification......…………..4 6.2 Power Board………………………………………..20...
  • Page 2: Revision List

    19" LCD Color Monitor ASI DW19MBD Revision List Version Date Revision History TPV Model Name Jan.-10-2008 Initial release T97MRHNLAWAIDN...
  • Page 3: Important Safety Notice

    19" LCD Color Monitor ASI DW19MBD Important Safety Notice Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service procedures recommended by AOC and described in this service manual are effective methods of performing service operations.
  • Page 4: Monitor Specification

    19" LCD Color Monitor ASI DW19MBD 1. Monitor Specification Driving system TFT Color LCD Size 48.1cm(19.0") LCD Panel Pixel pitch 0.285mm( H )x 0.285mm( V ) Response time 5 ms ( Typical ) R,G,B Analog Interface Video Digital Interface Input Separate Sync.
  • Page 5: Lcd Monitor Description

    19" LCD Color Monitor ASI DW19MBD 2. LCD Monitor Description The LCD Monitor will contain main board, power board, and key board which house the flat panel control logic, brightness control logic and DDC. The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage.
  • Page 6: Operation Instruction

    19" LCD Color Monitor ASI DW19MBD 3. Operation Instructions 3.1 General Instructions Press the power button to turn the monitor on or off. The other control buttons are located at front of the panel. By changing these settings, the picture can be adjusted to your personal performance.
  • Page 7: Adjusting The Picture

    19" LCD Color Monitor ASI DW19MBD 3.3 Adjust the Picture 1. Press the MENU-button to activate the OSD window. 2. Press < or > to navigate through the functions. Once the desired function is highlighted, press the MENU-button to activate it. If the function selected has a sub-menu, press < or > again to navigate through the sub-menu functions.
  • Page 8 19" LCD Color Monitor ASI DW19MBD Cool Recall Cool Color Temperature from EEPROM. sRGB Recall SRGB Color Temperature from EEPROM. User-B Blue Gain from Digital-register User-G Green Gain Digital-register. User-R Red Gain from Digital-register User User-Y Yellow Gain from Digital-register...
  • Page 9: Input/Output Specification

    19" LCD Color Monitor ASI DW19MBD 4. Input/Output Specification 4.1 Input Signal Connector D-Sub mini 15pin Connector PIN NO. DESCRIPTION PIN NO. DESCRIPTION Green Detect Cable Blue Ground DDC-Serial Data Ground H-Sync R-Ground V-Sync G-Ground DDC-Serial Clock B-Ground DVI-D 24pin Connector PIN NO.
  • Page 10: Factory Preset Display Modes

    19" LCD Color Monitor ASI DW19MBD 4.2 Factory Preset Display Modes Horizontal Vertical Resolution Standard Frequency Frequency Dos-mode 720 × 400 31.47kHz 70.0Hz 640 × 480 31.47kHz 60.0Hz 640 × 480 37.50kHz 75.0Hz 800 × 600 37.879kHz 60.0Hz SVGA 800 × 600 46.875kHz...
  • Page 11 19" LCD Color Monitor ASI DW19MBD 4.3.2 Optical Characteristics 4.3.3 Electrical Characteristics TFT Module Back-light...
  • Page 12: Block Diagram

    19" LCD Color Monitor ASI DW19MBD 5. Block Diagram 5.1 Software Flow Chart...
  • Page 13 19" LCD Color Monitor ASI DW19MBD REMARK: 1) MCU initialize. 2) Is the EEprom blank? 3) Program the EEprom by default values. 4) Get the PWM value of brightness from EEprom. 5) Is the power key pressed? 6) Clear all global flags.
  • Page 14: Electrical Block Diagram

    19" LCD Color Monitor ASI DW19MBD 5.2 Electrical Block Diagram Main Board Crystal 24 MHz LCD Interface (X401) (CN601) Scalar IC RTD2525L RTD2120L (Include ADC, OSD) (U401) (U501) H sync V sync Input signal D-Sub Connector Connector (CN302) (CN301)
  • Page 15: Schematic

    19" LCD Color Monitor ASI DW19MBD 6. Schematic 6.1 Main Board...
  • Page 16 19" LCD Color Monitor ASI DW19MBD...
  • Page 17 19" LCD Color Monitor ASI DW19MBD...
  • Page 18 19" LCD Color Monitor ASI DW19MBD...
  • Page 19 19" LCD Color Monitor ASI DW19MBD...
  • Page 20: Power Board

    19" LCD Color Monitor ASI DW19MBD 6.2 Power Board...
  • Page 21 19" LCD Color Monitor ASI DW19MBD...
  • Page 22 19" LCD Color Monitor ASI DW19MBD...
  • Page 23: Pcb Layout

    19" LCD Color Monitor ASI DW19MBD 7. PCB Layout 7.1 Main Board...
  • Page 24 19" LCD Color Monitor ASI DW19MBD...
  • Page 25: Power Board

    19" LCD Color Monitor ASI DW19MBD 7.2 Power Board...
  • Page 26: Key Board

    19" LCD Color Monitor ASI DW19MBD 7.3 Key Board...
  • Page 27: Maintainability

    19" LCD Color Monitor ASI DW19MBD 8. Maintainability 8.1 Equipments and Tools Requirement 1. Multi-meter. 2. Oscilloscope. 3. Pattern Generator. 4. DDC Tool with an Compatible Computer. 5. Alignment Tool. 6. LCD Color Analyzer. 7. Service Manual. 8. User Manual.
  • Page 28: Trouble Shooting

    19" LCD Color Monitor ASI DW19MBD 8.2 Trouble Shooting 8.2.1 Main Board No Power No power Press power key and look if the picture is normal Please reinsert and make sure the AC of 100-240 is normal Reinsert or check the...
  • Page 29 19" LCD Color Monitor ASI DW19MBD No Picture No picture Check the signal cable Change the signal cable Measure CN201 PIN3, 4=5V U201 PIN2=3V Replace CN201, U201 Measure X401 oscillate waveform is normal Replace X401 Measures U401 is normal Replace U401...
  • Page 30 19" LCD Color Monitor ASI DW19MBD White Screen White screen Measure Q602 base X401 oscillate is low level? waveform is normal Replace X401 Check Q601, Q602 is Check reset circuit of broken? U401 is normal Check Correspondent Check Correspondent component.
  • Page 31 19" LCD Color Monitor ASI DW19MBD 8.2.2 Power Board 1) No power Check L904 = 12V Check AC line volt 110V or 220V Check AC input Check the voltage of C905 (+) Check bridge rectified circuit and F901 circuit Check start voltage for the pin3 of IC901...
  • Page 32 19" LCD Color Monitor ASI DW19MBD 2.) No Backlight Check F801=12V Check adapter and F801 Check ON/OFF signal Check Interface board or main board Check IC801 PIN12=10.5V Change on/off circuit Check IC801 PIN5 have triangle wave Change IC801 Check IC801 PIN9/PIN10 PWM wave...
  • Page 33 19" LCD Color Monitor ASI DW19MBD 8.2.3 Key Board OSD is unstable or not working Is Key Pad Board connecting normally? Connect Key Pad Board Replace Button Switch Is Button Switch normally? Is Key Pad Board normally? Replace Key Pad Board...
  • Page 34: White-Balance, Luminance Adjustment

    = 313 ±25, y = 329 ±25, Y= 180cd/m2 3. Enter into factory mode of DW19MBD Turn on power, press the Menu button, pull out the power cord, and then plug the power cord. Then the factory OSD will be at the left top of the panel.
  • Page 35 19" LCD Color Monitor ASI DW19MBD 1. Switch the Chroma-7120 to RGB-Mode (with press “MODE” button) 2. Switch the MEM. Channel to Channel 9 (with up or down arrow on chroma 7120) 3. The LCD-indicator on chroma 7120 will show x = 283 ±25, y = 297 ±25, Y=180cd/m2 4.
  • Page 36: Monitor Exploded View

    19" LCD Color Monitor ASI DW19MBD 10. Monitor Exploded View...
  • Page 37: Bom List

    19" LCD Color Monitor ASI DW19MBD 11. BOM List T97MRHNLAWAIDN Location Part No. Description 040G 581 26704 SHIPPING LABEL 040G 58160811A GREEN DOT LABEL 041G 68508 A CONTROL CARD 044G6002815 1A PAPER BOARD 044G9003214 CORNER PAPER 045G 77 3 PE PACKING...
  • Page 38 19" LCD Color Monitor ASI DW19MBD Q44G6002101103 PAPER BOARD Q44G9066 1 Q44G9066 2 Q44G9066898 1A 19 LCD ASI CARTON Q45G 88607 34 PE BAG FOR BASE Q45G 88626 4 PE BAG FOR MONITOR 041G7880898 1A WARRANTY CARD 050G 600 2...
  • Page 39 19" LCD Color Monitor ASI DW19MBD C902 065G306M1022BM Y1.CAP.001UF 250VAC MURATA C921 065G306M4722BP 4700PF +-20% 400VAC C905 067G 40J10115K EC CAP 100UF 450V 18*35MM C922 067G215D4714KV E.C 105℃ CAP 470UF M 25V ED SERIES C803 067G215D4714KV E.C 105℃ CAP 470UF M 25V ED SERIES...
  • Page 40 19" LCD Color Monitor ASI DW19MBD R320 061G0402100 RST CHIPR 10 OHM +-5% 1/16W R319 061G0402100 RST CHIPR 10 OHM +-5% 1/16W R318 061G0402100 RST CHIPR 10 OHM +-5% 1/16W R301 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R303 061G0402101...
  • Page 41 19" LCD Color Monitor ASI DW19MBD R441 061G0402220 RST CHIPR 22 OHM +-5% 1/16W R304 061G0402222 RST CHIPR 2.2 KOHM +-5% 1/16W R305 061G0402222 RST CHIPR 2.2 KOHM +-5% 1/16W R401 061G0402392 RST CHIP 3.9K 1/16W 5% R403 061G0402392 RST CHIP 3.9K 1/16W 5%...
  • Page 42 19" LCD Color Monitor ASI DW19MBD C304 065G0402473 12 CHIP 0.047UF 16V X7R C306 065G0402473 12 CHIP 0.047UF 16V X7R C307 065G0402473 12 CHIP 0.047UF 16V X7R C309 065G0402473 12 CHIP 0.047UF 16V X7R C311 065G0402473 12 CHIP 0.047UF 16V X7R...
  • Page 43 19" LCD Color Monitor ASI DW19MBD 051G 200 1 OIL FOR DISAPPEAR Q901 057G 667 30 2SK2645 090G6263 1 HEAT SINK 0M1G1730 8120 SCREW 051G 200 1 OIL FOR DISAPPEAR D906 093G 60218 SB10100FCT 0M1G1730 8120 SCREW Q90G0117 2 HEAT SINK...
  • Page 44 19" LCD Color Monitor ASI DW19MBD R815 061G0603150 1F RST CHIPR 1.5 KOHM +-1% 1/10W R816 061G0603150 1F RST CHIPR 1.5 KOHM +-1% 1/10W R861 061G0603220 3F RST CHIPR 220KOHM +-1% 1/10W R930 061G0603243 1F RST CHIPR 2.43 KOHM +-1% 1/10W...
  • Page 45 19" LCD Color Monitor ASI DW19MBD R932 061G1206304 300 KOHM 1/8W R933 061G1206304 300 KOHM 1/8W R855 061G1206330 RST CHIPR 33 OHM +-5% 1/4W R856 061G1206330 RST CHIPR 33 OHM +-5% 1/4W R857 061G1206330 RST CHIPR 33 OHM +-5% 1/4W...
  • Page 46 19" LCD Color Monitor ASI DW19MBD D806 093G 6432S IN4148W D812 093G 6432S IN4148W D916 093G 6432S IN4148W D915 093G 6432S IN4148W D903 093G 6432S IN4148W D817 093G 6432S IN4148W D814 093G 6432S IN4148W D809 093G 6432S IN4148W D808 093G 6432S...

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