Dixon N20W Service Manual Download Page 31 | Manualshive

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Dixon N20W Service Manual Download Page 31

20" LCD Color Monitor

Dixon N20W

31

8.2 Trouble Shooting

8.2.1 Main Board

(2) No Picture

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

X401 oscillate waveforms

are normal

Check CN701 or replace
U702,Q702 or D701

Replace U401

Replace X401

OK

OK

OK

NG

NG

NG

NG

Measure U702 PIN2=3.3V

D701 (-) =1.8V

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Summary of Contents for N20W

Page 1: ...on 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 Specificat...

Page 2: ...20 LCD Color Monitor Dixon N20W 2 Revision List Version Release Date Revision History TPV Model Name A00 Jun 12 2007 Initial release TA7CMADBW3DXAN A01 Oct 12 2007 Second release TA7CMADBW3DXAG...

Page 3: ...haracteristics may create shock fire or other hazards Under no circumstances should the original design be modified or altered without written permission from AOC AOC assumes no liability express or i...

Page 4: ...preset resolution 1680 x 1050 60 Hz Plug Play VESA DDC2B DDC CI Input Connector D Sub 15pin Input Video Signal Analog 0 7Vp p standard 75 OHM Positive Power Source 100 240VAC 47 63Hz Power Consumption...

Page 5: ...tness 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 AC IN 100V 240V Power board Include adapter inv...

Page 6: ...knobs are located at front panel of the monitor By changing these settings the picture can be adjusted to your personal preferences The power cord should be connected Press the power button to turn o...

Page 7: ...H Position Adjust the horizontal position of the picture V Position Adjust the vertical position of the picture Color Temp Warm N A Recall warm Color Temperature from EEPROM Cool N A Recall cool Colo...

Page 8: ...uage Language N A Select the language you like Information Information N A Show the resolution H V frequency and input port of current input timing Reset Yes N A Clear each old status of Auto configur...

Page 9: ...8 GND B VGA connector layout 4 2 Factory Preset Display Modes Stand Resolution Horizontal Frequency KHz Vertical Frequency Hz Dos mode 720 x 400 31 47 70 0 VGA 640 x 480 31 47 60 0 VGA 640 x 480 37 5...

Page 10: ...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...

Page 11: ...20 LCD Color Monitor Dixon N20W 11 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 12 2 Backlight...

Page 13: ...20 LCD Color Monitor Dixon N20W 13 5 Block Diagram 5 1 Software Flow Chat 1 2 N Y 5 Y N 10 Y N 12 Y N 7 Y N 6 4 3 8 9 14 11 13 Y N 15 Y N 16 17 19 Y N 18...

Page 14: ...he LED and set it to green color Scalar initializes 10 In standby mode 11 Update the lifetime of back light 12 Check the analog port are there any signals coming 13 Does the scalar send out an interru...

Page 15: ...Diagram 5 2 1 Main Board EEPROM M24C02 U404 EEPROM 24LC16B SNG U403 Panel Interface CN101 SDA SCL Crystal 14 318MHZ X401 Flash Memory PM25LV010A 100 U402 Scalar TSUMU58WHJ LF Include MCU ADC OSD U401...

Page 16: ...ard CN902 DIM DIM EMI filter Start Circuit R905 PWM Control IC Transformer AC input 12V ON OFF Control PWM Control IC Feedback Circuit Output Circuit Transformer MOSFET Over Voltage Lamp ON OFF 5V Bri...

Page 17: ...1 10W Q705 PMBS3906 GND 715G2186 1 B POWER Custom 2 5 Thursday October 12 2006 Title Size Document Number Rev Date Sheet of 12V R721 0 1 10W C707 NC VCC3 3 5V R723 10K 1 10W 12V C710 100uF 25V R704 10...

Page 18: ...D419 BAV99 3 1 2 HDCP_RST 4 PC5V DDCA_SDA 4 DAT1 G 4 R450 10K 1 10W RED C452 0 1uF DDCD_SDA 4 SCL_DVI R451 10K 1 10W CN406 JACK 1 2 3 4 5 6 7 8 25 28 9 10 11 12 13 14 15 16 26 29 17 18 19 20 21 22 23...

Page 19: ...1 10W LVDS 715G2186 1 R428 100 1 10W BIN 3 G 3 OUT R C457 0 1uF PB2 KEY_B R408 10K 1 10W VCC3 3 2 R487 10K 1 10W VCC1 8 5V KEY_RIGHT KEY_A C418 10uF 50V PA 0 9 5 PA1 R425 10K 1 10W VCC3 3 KEY_C CN404...

Page 20: ...R720 150 1 4W PB3 LVA2M LVA1M VLCD 2 PA 0 9 4 RXE1 LVACKP RXO0 LVA0M LVB2P RXO2 LVB3M PB0 RXE3 RXO0 PA1 LVB2M LVACKP VLCD LVB1M RXE1 C720 22uF 50V PA9 RXE2 LVA0P PA5 LVB1P PB4 LVA3P LVA0M LVB2M LVB0M...

Page 21: ...1500pF 1KV R900 330K 1 4W ZD920 PTZ9 1B 1 2 IC921 KIA431A AT P C930 0 1uF R927 100 1 8W D900 BA159GPT R905 10K 1 4W L901 4 0mH 1 2 4 3 L921 3 5uH C926 1000uF 16V R912 10 1 4W C902 1000pF ZD922 RLZ5 1B...

Page 22: ...3904 PT802 POWER X FMR 6 3 7 4 1 8 R836 1K 1 8W R807 22 1 4W R841 300 OHM 1 8W C826 3pF 3KV R814 56K 1 8W R825 560 1 8W R830 15K 1 8W C830 47pF R843 1K 1 8W D801 BAV70 3 1 2 C804 2 2uF 16V C832 47pF R...

Page 23: ...20 LCD Color Monitor Dixon N20W 23 7 PCB Layout 7 1 Main Board 715G2186 1...

Page 24: ...20 LCD Color Monitor Dixon N20W 24...

Page 25: ...20 LCD Color Monitor Dixon N20W 25...

Page 26: ...20 LCD Color Monitor Dixon N20W 26 7 2 Power Board 715G1823 1 AO...

Page 27: ...20 LCD Color Monitor Dixon N20W 27...

Page 28: ...20 LCD Color Monitor Dixon N20W 28...

Page 29: ...20 LCD Color Monitor Dixon N20W 29 7 3 Audio Board 715G2098 1 7 4 Key Board 715G1317 1 8...

Page 30: ...on N20W 30 8 Maintainability 8 1 Equipments And Tools Requirement 1 Voltmeter 2 Oscilloscope 3 Pattern Generator 4 DDC Tool with an IBM Compatible Computer 5 Alignment Tool 6 LCD Color Analyzer 7 Serv...

Page 31: ...wer 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 X401 oscillate waveforms are normal Check CN701 or re...

Page 32: ...K OK NG NG 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 s...

Page 33: ...Q706 Q705 Q704 are broken or CN101 solder Check Correspondent component Replace Panel Check Correspondent component Replace U401 OK OK Replace X401 OK NG NG NG NG Check reset circuit of U401 is normal...

Page 34: ...eck the voltage of C907 Check bridge rectified circuit and F901 circuit Check start voltage for the pin8 of IC901 Check R911 Change IC901 NG Check the auxiliary voltage is bigger than 10V and smaller...

Page 35: ...ck Interface board or main board NG OK Check IC801 PIN2 5V NG OK Change on off circuit Check IC801 PIN13 have triangle wave NG OK Change IC801 Check IC801 PIN1 PIN15 PWM wave NG OK Check Q802 Q803 Che...

Page 36: ...6 8 2 3 Key Board OSD is unstable or not working Is Key Pad Board connecting normally Connect Key Pad Board Is Button Switch normally Replace Button Switch Y N N Is Key Pad Board normally Replace Key...

Page 37: ...ture 1 Switch the chroma 7120 to RGB Mode with press MODE button 2 Switch the MEM channel to Channel 3 with up or down arrow on chroma 7120 3 The LCD indicator on chroma 7120 will show x 313 20 y 329...

Page 38: ...y 329 20 Y 180 cd m2 4 Adjust the RED of color3 on factory window until chroma 7120 indicator reached the value R 100 5 Adjust the GREEN of color3 on factory window until chroma 7120 indicator reached...

Page 39: ...20 LCD Color Monitor Dixon N20W 39 10 Monitor Exploded View...

Page 40: ...1 HINGE 2 LENS 12 SCREW 22 SCREW 3 KEY BUTTON 13 IO BRACKET 23 SCREW 4 KEY BOARD 14 SCREW 24 SCREW 5 MAIN FRAME 15 REAR COVER 20 25 STAND REAR COVER 6 LCD PANEL 16 VESA BKT 26 BASE 7 SCREW M3X6 17 N A...

Page 41: ...10 47 CR3 SCREW 0M1G 930 5 47 CR3 SCREW 0M1G1140 6120 SCREW 0M1G1730 6120 SCREW 0M1G1730 6120 SCREW 0M1G1730 6120 SCREW 0M1G2940 10225 CR3 SCREW 705GAAK0P34002 20 LCD STAND ASS Y A34G0131 GM 1B STAND...

Page 42: ...CER1 0603 NP0 50V 100P PM5 R C212 065G0603101 31 CER1 0603 NP0 50V 100P PM5 R C203 065G0603104 32 CHIP 0 1UF 50V X7R C213 065G0603104 32 CHIP 0 1UF 50V X7R C206 065G0603474 27 CHIP 0 47UF 25V Y5V C20...

Page 43: ...T PZT2907A Q704 057G 763 1 A03401 SOT23 BY AOS A1 R721 061G0603000 RST CHIPR 0 OHM 5 1 10W R421 061G0603000 RST CHIPR 0 OHM 5 1 10W R419 061G0603000 RST CHIPR 0 OHM 5 1 10W FB412 061G0603000 RST CHIP...

Page 44: ...R 10 KOHM 5 1 10W R426 061G0603103 RST CHIPR 10 KOHM 5 1 10W R432 061G0603103 RST CHIPR 10 KOHM 5 1 10W R444 061G0603103 RST CHIPR 10 KOHM 5 1 10W R450 061G0603103 RST CHIPR 10 KOHM 5 1 10W R451 061G0...

Page 45: ...60 RST CHIPR 56 OHM 5 1 10W R438 061G0603750 RST CHIPR 75 OHM 5 1 10W R439 061G0603750 RST CHIPR 75 OHM 5 1 10W R440 061G0603750 RST CHIPR 75 OHM 5 1 10W R719 061G1206151 RST CHIPR 150 OHM 5 1 4W R720...

Page 46: ...603104 32 CHIP 0 1UF 50V X7R C405 065G0603104 32 CHIP 0 1UF 50V X7R C404 065G0603104 32 CHIP 0 1UF 50V X7R C402 065G0603104 32 CHIP 0 1UF 50V X7R C401 065G0603104 32 CHIP 0 1UF 50V X7R C442 065G060322...

Page 47: ...ODE ZENER RLZ36B ROHM D701 093G1020 1 S GS1D D704 093G2004 2 SR24 PANJIT SMT 715G2186 1 MAIN BOARD PCB KEPC6AAC KEY BOARD 089G176S 10501 FFC CABLE SW103 077G 604 2 TO TACT 5W BY TOUKE TS 9 TMG 553 SW1...

Page 48: ...10 16 ZL C923 067G215Y681 4H 680UF 25V 10 16 ZL C922 067G215Y681 4H 680UF 25V 10 16 ZL L902 073G 174 65 H LINE FILTER L901 073G 174 76 L CHOKE COIL LI TAI LF 002923 L922 073G 253 91 H CHOKE COIL L921...

Page 49: ...T CHIPR 1KOHM 5 1 8W R928 061G0805102 RST CHIPR 1KOHM 5 1 8W R803 061G0805103 10 KOHM 1 10W R812 061G0805103 10 KOHM 1 10W R915 061G0805103 10 KOHM 1 10W R923 061G0805103 10 KOHM 1 10W R810 061G080510...

Page 50: ...HM 5 1 4W R828 061G1206150 RST CHIPR 15 OHM 5 1 4W R829 061G1206150 RST CHIPR 15 OHM 5 1 4W R807 061G1206220 RST CHIPR 22 OHM 5 1 4W R802 061G1206304 300 KOHM 1 8W R902 061G1206334 RST CHIPR 330KOHM 5...

Page 51: ...D803 093G 64 42 PP BAV70 SOT 23 D801 093G 64 42 PP BAV70 SOT 23 D916 093G 64 44 S LL4148WP D915 093G 64 44 S LL4148WP D910 093G 64 44 S LL4148WP D804 093G 6433P BAV99 D802 093G 6433P BAV99 ZD801 093G...

Page 52: ...40G000267311A WINDOW VISTA LABEL Q41G780062444A QSG Q44G6000 116A EMPTY CARTON Q44G6000 117A EMPTY CARTON Q44G6002118 97 PAPER BOARD Q44GA024 1 EPS L Q44GA024 2 EPS R Q44GA024600 1A 20 LCD NO BRAND CA...

Page 53: ...20 LCD Color Monitor Dixon N20W 53 12 Different Parts List Diversity of TA7CMADBW3DXAG compared with TA7CMADBW3DXAN Location Part No Description 750GLCA1WA423N PANEL CLAA201WA04 011...

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