Dixon N20W Service Manual
Dixon N20W Service Manual

Dixon N20W Service Manual

20" lcd color monitor

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20" 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 Buttons......................................................6
3.3.OSD Settings..........................................................7
4.Input/Output Specification......................................9
4.1.Input Signal Connector........................................9
4.2.Factory Preset Display Modes..........................9
4.3.Panel Specification.........................................10
5.Block Diagram.........................................................13
5.1.Software Flow Chart...........................................13
5.2.Electrical Block Diagram.....................................15
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
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

TABLE OF CONTENTS

Page
Description
6.Schematic.....................................................17
6.1 Main Board....................................................17
6.2 Power Board.................................................21
7.PCB Layout.....................................................23
7.1.Main Board.................................................23
7.2.Power Board..............................................26
7.3. Audio Board.................................................29
7.4 Key Board.................................................29
8.Maintainability................................................30
8.2.Trouble Shooting..........................................31
10.Monitor Exploded View.................................39
11.BOM List...................................................41
12.Different Parts List....................................53
SAFETY NOTICE
1
Dixon N20W
Horizontal Frequency
31 kHz-82 kHz
Page

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Summary of Contents for Dixon N20W

  • Page 1: Table Of Contents

    20" LCD Color Monitor Dixon N20W Service Service Service Horizontal Frequency 31 kHz-82 kHz TABLE OF CONTENTS Description Page Description Page Table Of Contents..……......…..1 6.Schematic……………........17 Revision List.…..........……..2 6.1 Main Board……..........17 Important Safety Notice.……......……..3 6.2 Power Board…..……........21 1.Monitor Specification........………..4 7.PCB Layout..…………........23 2.LCD Monitor Description………….…………………..5...
  • Page 2: Revision List

    20" LCD Color Monitor Dixon N20W Revision List Version Release Date Revision History TPV Model Name Jun-12-2007 Initial release TA7CMADBW3DXAN Oct-12-2007 Second release TA7CMADBW3DXAG...
  • Page 3: Important Safety Notice

    20" LCD Color Monitor Dixon N20W 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

    20" LCD Color Monitor Dixon N20W 1. Monitor Specifications Model number N20W Driving system TFT Color LCD Size 510mm ( 20") Pixel pitch 0.258mm(H) x 0.258mm(V) LCD Panel Video R, G, B Analog lnterface Separate Sync. H/V TTL Display Color 16.7 million Colors...
  • Page 5: Lcd Monitor Description

    20" LCD Color Monitor Dixon N20W 2. LCD Monitor Description The LCD monitor will contain a main board, a power board, a key board and an audio board which house the flat panel control logic, brightness control logic and DDC.
  • Page 6: Operation Instruction

    20" LCD Color Monitor Dixon N20W 3. Operating Instructions 3.1 General Instructions Press the power button to turn the monitor on or off. The other control knobs are located at front panel of the monitor. By changing these settings, the picture can be adjusted to your personal preferences.
  • Page 7: Osd Settings

    20" LCD Color Monitor Dixon N20W 3.3 OSD Settings Main Menu Sub Menu Main Menu Icon Sub Menu Icon Description Item Item Contrast Contrast from Digital-register. Luminance Brightness Backlight Adjustment Adjust Picture Phase to reduce Focus Horizontal-Line noise Image Setup...
  • Page 8 20" LCD Color Monitor Dixon N20W Adjust the horizontal position of the H. Position OSD. Adjust the vertical position of the OSD Setup V. Position OSD. OSD Timeout Adjust the OSD timeout. Language Language Select the language you like Show the resolution, H/V frequency...
  • Page 9: Input/Output Specification

    20" LCD Color Monitor Dixon N20W 4. Input/Output Specification 4.1 Input Signal Connector Pin No. Description Pin No. Description Video-Red Video-Green Detect Cable Video-Blue DDC-Serial Data H-Sync GND-R V-Sync GND-G DDC-Serial clock GND-B VGA connector layout 4.2 Factory Preset Display Modes...
  • Page 10: Panel Specification

    20" LCD Color Monitor Dixon N20W 4.3 Panel Specification 4.3.1 General Description CLAA201WA04 is 20.1” (51.11cm) color TFT-LCD (Thin Film Transistor Liquid Crystal Display) module composed of LCD panel, LVDS driver ICs, control circuit and backlight(CCFL, 4 tubes). By applying 8 bit digital data (6bits+Hi-FRC), 1680×1050, drived by 5 voltages,16.7M-color images are displayed on the 20.1”...
  • Page 11 20" LCD Color Monitor Dixon N20W 4.3.3 Optical Characteristics Ta=25℃,VCC=5.0V 4.3.4 Electrical Characteristics (1) TFT-LCD Ta=25℃...
  • Page 12 20" LCD Color Monitor Dixon N20W (2) Backlight...
  • Page 13: Block Diagram

    20" LCD Color Monitor Dixon N20W 5. Block Diagram 5.1 Software Flow Chat...
  • Page 14 20" LCD Color Monitor Dixon N20W 1) MCU initialize. 2) Is the EPROM blank? 3) Program the EPROM by default values. 4) Get the PWM value of brightness from EPROM. 5) Is the power key pressed? 6) Clear all global flags.
  • Page 15: Electrical Block Diagram

    20" LCD Color Monitor Dixon N20W 5.2 Electrical Block Diagram 5.2.1 Main Board Panel Interface (CN101) Crystal Scalar TSUMU58WHJ-LF Flash Memory 14.318MHZ (Include MCU, ADC, OSD) PM25LV010A-100 (X401) (U401) (U402) H sync V sync EEPROM 24LC16B/SNG D-Sub (U403) Connector (CN405)
  • Page 16 20" LCD Color Monitor Dixon N20W 5.2.2 Inverter/Power Board AC input Bridge Rectifier Transformer Rectifier diodes EMI filter and Filter Start Circuit: R905 CN902 Feedback Circuit Control IC ON/OFF Output MOSFET Circuit Transformer Lamp Over ON/OFF Feedback Control Voltage Circuit...
  • Page 17: Schematic

    20" LCD Color Monitor Dixon N20W 6. Schematic 6.1 Main Board 715G2186-1 VCTRL SOT-223 R702 +3V3 1/10W   U701 D704 VCC1.8 SR24 TO-263 VCC3.3 C702 4.7uF/50V VCC1.8 4 C701 C703 C704 U702 D701 VCC3.3 VOUT 0.1uF C712 C714 GS1D C713...
  • Page 18 20" LCD Color Monitor Dixon N20W CN405 RED+ FB410 0   1/10W R434   1/10W C432 0.047uF RED- GREEN+ FB411 0   1/10W R435   1/10W C433 0.047uF GREEN- BLUE+ FB412 0   1/10W R436   1/10W C434 0.047uF BLUE-...
  • Page 19 20" LCD Color Monitor Dixon N20W AVDD_33 VDDC VDDP AVDD_18 AVDD_MEMPLL_33 VCC3.3 FB403 VDDP VCC3.3 VCC3.3 FB405 AVDD_MEMPLL_33 600 OHM C408 600 OHM 10uF/50V VCC3.3 VCTRL VCTRL C416 C409 C410 C411 C412 C413 C419 C420 C461 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF...
  • Page 20: Panel Interface

    20" LCD Color Monitor Dixon N20W CN101 PA[0..9] PA[0..9] LVA3P LVB0M RXO0- RXO0+ LVB0P LVA3M LVB1M RXO1- RXO1+ LVB1P LVACKP LVB2M RXO2- RXO2+ LVB2P LVACKM LVBCKM RXOC- RXOC+ LVBCKP LVA2P LVB3M RXO3- RXO3+ LVB3P LVA2M LVA0M RXE0- RXE0+ LVA0P LVA1P...
  • Page 21: Power Board

    20" LCD Color Monitor Dixon N20W 6.2 Power Board R951 47Ω 1/4W 0.001uF/500V R952 C920 BD901 47Ω 1/4W 2KBP08M D920 3.5uH SP10150 R909 T901 L921 100KΩ 2W +12V C907 C925 R931 100UF/450V 470uF/25V 10KΩ 1/4W R905 C910 10KΩ 1/4W 1500pF/1KV...
  • Page 22 20" LCD Color Monitor Dixon N20W CN801 PT801 POWER X'FMR R836 C835 穝糤箂ンC828,C829 +12V CONN C816 15PF/3KV 1KΩ 1/8W 0Ω 1/4W CN802 R802 R804 R805 R818 R819 300KΩ 1/4W 10KΩ 1/4W 470Ω 1/4W C811 15Ω 1/4W 15Ω 1/4W 470uF/25V C817...
  • Page 23: Pcb Layout

    20" LCD Color Monitor Dixon N20W 7. PCB Layout 7.1 Main Board 715G2186-1...
  • Page 24 20" LCD Color Monitor Dixon N20W...
  • Page 25 20" LCD Color Monitor Dixon N20W...
  • Page 26: Power Board

    20" LCD Color Monitor Dixon N20W 7.2 Power Board 715G1823-1-AO...
  • Page 27 20" LCD Color Monitor Dixon N20W...
  • Page 28 20" LCD Color Monitor Dixon N20W...
  • Page 29: Audio Board

    20" LCD Color Monitor Dixon N20W 7.3 Audio Board 715G2098-1 7.4 Key Board 715G1317-1-8...
  • Page 30: Maintainability

    20" LCD Color Monitor Dixon N20W 8. Maintainability 8.1 Equipments And Tools Requirement Voltmeter. Oscilloscope. Pattern Generator. DDC Tool with an IBM Compatible Computer. Alignment Tool. LCD Color Analyzer. Service Manual. User Manual.
  • Page 31: Trouble Shooting

    20" LCD Color Monitor Dixon N20W 8.2 Trouble Shooting 8.2.1 Main Board 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 Adapter/Inverter section Measure U702 PIN2=3.3V...
  • Page 32 20" LCD Color Monitor Dixon N20W No picture Measure U702 PIN2=3.3V D701(-)=1.8V Replace U702, Q702 or D701 X401 oscillate waveforms are normal Replace X401 Check if the sync signal from computer is output and video cable Input the sync signal of...
  • Page 33 20" LCD Color Monitor Dixon N20W (3) White screen White screen Measure Q706 base X401 oscillate waveform is normal is high level? Replace X401 Check Q706, Q705,Q704 are broken or CN101 solder? Check reset circuit of U401 is normal Check Correspondent Check Correspondent component.
  • Page 34 20" LCD Color Monitor Dixon N20W 8.2.2 Power/Inverter Board 1.) No power Check CN902 pin12 = 12V Check AC line volt 110V or 220V Check AC input Check the voltage of C907 (+) Check bridge rectified circuit and F901 circuit...
  • Page 35 20" LCD Color Monitor Dixon N20W 2.) W / LED, No Backlight Check R802=12V Check adapter and R802 Check ON/OFF signal Check Interface board or main board Check IC801 PIN2=5V Change on/off circuit Check IC801 PIN13 have triangle wave Change IC801...
  • Page 36 20" LCD Color Monitor Dixon N20W 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? Replace Key Pad Board Is Key Pad Board normally?
  • Page 37: White-Balance, Luminance Adjustment

    20" LCD Color Monitor Dixon N20W 9. White- Balance, Luminance Adjustment Approximately 30 minutes should be allowed for warm up before proceeding White-Balance adjustment. 1. How to do the Chroma-7120 MEM. Channel setting A. Reference to chroma 7120 user guide B.
  • Page 38 20" LCD Color Monitor Dixon N20W C. Adjust sRGB color-temperature 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 = 313 ±20, y = 329 ±20, Y = 180 cd/m 4.
  • Page 39: Monitor Exploded View

    20" LCD Color Monitor Dixon N20W 10. Monitor Exploded View...
  • Page 40: Parts List

    20" LCD Color Monitor Dixon N20W Parts List Item Description Item Description Item Description BEZEL SCREW HINGE LENS SCREW SCREW KEY BUTTON IO BRACKET SCREW KEY BOARD SCREW SCREW MAIN FRAME REAR COVER(20") STAND REAR COVER LCD PANEL VESA BKT...
  • Page 41: Bom List

    20" LCD Color Monitor Dixon N20W 11. BOM List TA7CMADBW3DXAN Location Part No. Description 044G9003194 CORNER PAPER 050G 600 2 HANDLE1 050G 600 3 HANDLE2 052G 1185 MIDDLE TAPE 052G 1186 SMALL TAPE 078G 322 6 Y SPK 8OHM 1.5W SU...
  • Page 42 20" LCD Color Monitor Dixon N20W 040G 581 26605 LABEL-P/N U201 056G 616 31 IC TDA7496T 1.2W*2 DIP-20 ST C201 067G 215221 4 220UF +-20% 25V C202 067G 215221 4 220UF +-20% 25V C205 067G 305221 3T 220UF/16V C207 067G 305221 3T...
  • Page 43 20" LCD Color Monitor Dixon N20W C702 067G215Y479 7N LOW ESR EC 4.7 UF 50V NC C403 067G215Y479 7N LOW ESR EC 4.7 UF 50V NC CN405 088G 35315F H D-SUB 15PIN X401 093G 2253B J1 XTL NXS14.31818AE32F-KAB5 20PPM 49/U-S...
  • Page 44 20" LCD Color Monitor Dixon N20W R488 061G0603101 RST CHIPR 100 OHM +-5% 1/10W R704 061G0603101 RST CHIPR 100 OHM +-5% 1/10W R412 061G0603102 RST CHIP 1K 1/10W 5% R430 061G0603102 RST CHIP 1K 1/10W 5% R446 061G0603102 RST CHIP 1K 1/10W 5%...
  • Page 45 20" LCD Color Monitor Dixon N20W R405 061G0603223 RST CHIPR 22 KOHM +-5% 1/10W R403 061G0603390 0F RST CHIPR 390 OHM +-1% 1/10W R475 061G0603392 RST CHIPR 3.9 KOHM +-5% 1/10W R474 061G0603392 RST CHIPR 3.9 KOHM +-5% 1/10W R437...
  • Page 46 20" LCD Color Monitor Dixon N20W C719 065G0603104 32 CHIP 0.1UF 50V X7R C721 065G0603104 32 CHIP 0.1UF 50V X7R C456 065G0603104 32 CHIP 0.1UF 50V X7R C419 065G0603104 32 CHIP 0.1UF 50V X7R C420 065G0603104 32 CHIP 0.1UF 50V X7R...
  • Page 47 20" LCD Color Monitor Dixon N20W FB408 071G 56Z601 CHIP BEAD 600 OHM 0805 FB407 071G 56Z601 CHIP BEAD 600 OHM 0805 FB405 071G 56Z601 CHIP BEAD 600 OHM 0805 FB404 071G 56Z601 CHIP BEAD 600 OHM 0805 FB403 071G 56Z601...
  • Page 48 20" LCD Color Monitor Dixon N20W C825 065G 3J1506ET 15PF 5% CC45SL 3KV TDK C826 065G 3J3096ET 3PF,J,3KV,Z5P C817 065G 3J3096ET 3PF,J,3KV,Z5P C901 065G305M1022EM Y2 1000PF +-20% 250VAC C902 065G305M1022EM Y2 1000PF +-20% 250VAC C903 065G305M1022EM Y2 1000PF +-20% 250VAC...
  • Page 49 20" LCD Color Monitor Dixon N20W Q90G0062 1 HEAT SINK IC901 056G 379 61 LD7575PS SOP-8 IC801 056G 608 10 IC OZ9938GN-B SOIC-16 Q803 057G 417 4 PMBS3904/PHILIPS-SMT(04) Q802 057G 417 4 PMBS3904/PHILIPS-SMT(04) Q801 057G 417 4 PMBS3904/PHILIPS-SMT(04) Q805 057G 763 14...
  • Page 50 20" LCD Color Monitor Dixon N20W R835 061G0805561 560 0805 R814 061G0805563 56KOHM 1/10W C835 061G1206000 RST CHIPR 0 OHM +-5% 1/4W C836 061G1206000 RST CHIPR 0 OHM +-5% 1/4W C837 061G1206000 RST CHIPR 0 OHM +-5% 1/4W C838 061G1206000...
  • Page 51 20" LCD Color Monitor Dixon N20W C912 065G0805104 32 CHIP 0.1U 50V X7R C806 065G0805105 22 CHIP 1UF 25V X7R 0805 C812 065G0805152 32 CHIP 1500PF 50V X7R 0805 C813 065G0805152 32 CHIP 1500PF 50V X7R 0805 C822 065G0805152 32...
  • Page 52 20" LCD Color Monitor Dixon N20W Q52G6025 13 76 MYLAR Q85G0043 1 S SHIELD Q15G0128 4 MAIN FRAME_CPT Q15G0129 1 IO BRACKET Q15G0156 1 CABLE PLATE Q26G 800504 2 BAR CODE LABEL Q40G 20N61515A RATING LABEL Q40G000261562A POP LABEL Q40G000267311A...
  • Page 53: Different Parts List

    20" LCD Color Monitor Dixon N20W 12. Different Parts List Diversity of TA7CMADBW3DXAG compared with TA7CMADBW3DXAN Location Part No. Description 750GLCA1WA423N PANEL CLAA201WA04 011...

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