ViewSonic VA905-1 Service Manual Download Page 50 | Manualshive

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2. Disassembly of Front Cover and Rear Cover

2.1

Unscrew three screws that secure Rear Cover to remove Front Cover.

2.2

Unscrew five screws to remove Rear Cover.

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Summary of Contents for VA905-1

Page 1: ...Model No VS10805 19 Color TFT LCD Display Service Manual ViewSonic VA905 1 ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800 888 8583 VA905_SM Rev 1a Jun 2005...

Page 2: ...of and specifically disclaims any warranty of merchantability or fitness for any particular purpose Further ViewSonic reserves the right to revise this publication and to make changes from time to tim...

Page 3: ...Troubleshooting Flow Chart 9 Block Diagram 10 Schematic Diagrams 7 Recommended Spare Parts List 1 Precautions and Safety Notices 5 Adjustment Procedure 8 Exploded Diagram and Spare Parts List 11 PCB L...

Page 4: ...cause of the high voltage used in the inverter circuit the voltage is exposed in such areas as the associated transformer circuits 4 LCD Module Handling Precautions 4 1 Handling Precautions 1 Since fr...

Page 5: ...he LCD contains a small amount of mercury Please follow local ordinances or regulations for disposal 13 The LCD module contains a small amount of materials having no flammability grade The LCD module...

Page 6: ...l or the front cover of the monitor Do not touch the surface of the polarizer Surface of the LCD panel is pressed by fingers and that may cause Mura Take out the monitor with cushions Taking out the m...

Page 7: ...and soft foam pad Placing the monitor on foreign objects That could scratch the surface of the panel or cause Mura The panel is placed facedown on the lap That may cause Mura 4 ViewSonic Corporation C...

Page 8: ...24 60Hz Look up table timing Analog 1 640 x 350 70Hz 31 5kHz 2 640 x 480 60Hz 31 5kHz 3 640 x 480 67Hz 35 0kHz 4 640 x 480 75Hz 37 5kHz 5 640 x 480 72Hz 37 9kHz 6 640 x 480 85Hz 43 27kHz 7 720 x 400 7...

Page 9: ...6 LCD Panel Panel Characteristics Panel Type HSD190ME12 A02 Type TFT ACTIVE MATRIX Active Size 376 32 H x 301 056 V Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0 294 mm of Backlights 4 CCFL edge...

Page 10: ...ight 525 mm Depth 145 mm Gross Weight 7 1kg 15 6 lb 8 Environmental Environmental Conditions Operating Temperature 0 C to 40 C Storage Temperature 20 C to 60 C Operating Relative Humidity 20 to 80 RH...

Page 11: ...n Displays the control screen for the highlighted control Also toggles between two controls on some screens Also a shortcut to Auto Image Adjust Power light Green ON Orange Power Saving Standby Power...

Page 12: ...up and down buttons Main Menu Auto Adjust To automatically adjust H V Position Phase adjust and Clock adjust REMARK There may need manual adjustment of phase for optimized performance for various VGA...

Page 13: ...ightness To adjust the Contrast of the video and the backlight currency Color Adjust To select the color temperature 6500 K 9300 K 5400 K or user settings 10 ViewSonic Corporation Confidential Do Not...

Page 14: ...Information To display the data about Horizontal Vertical frequency Pixel clock Resolution Model number and Serial No of the monitor 11 ViewSonic Corporation Confidential Do Not Copy VA905...

Page 15: ...nd vertical position of the video Hsize To adjust the horizontal pixel clock of the video Fine Tune To adjust the delay time of data and clock Sharpness To select the picture sharpness of display 12 V...

Page 16: ...n to 1280x1024 OSD Position To set OSD position OSD Timeout To set the displaying time of OSD INPUT SELECT TO SELECT DSUB ANALOG OR DVID DIGITAL INPUT Memory Recall Restore default settings of Clock H...

Page 17: ...2 Up Down White Balance White Balance should set the screen on the pure black and white pattern with 640 480 60Hz resolution 2 Down hold for 10 seconds Power Lock Unlock User won t be able to turn of...

Page 18: ...with resolutions up to SXGA It is configured with an integrated triple ADC PLL a high quality scaling engine an on screen display controller a built in output clock generator an integrated DVI receiv...

Page 19: ...x 480 67Hz 35 0kHz 4 640 x 480 75Hz 37 5kHz 5 640 x 480 72Hz 37 9kHz 6 640 x 480 85Hz 43 27kHz 7 720 x 400 70Hz 31 5kHz 8 800 x 600 56Hz 35 1kHz 9 800 x 600 60Hz 37 9kHz 10 800 x 600 75Hz 46 9kHz 11...

Page 20: ...ckness Horizontal and Vertical position of video should be adjustable to be within the screen frame Figure 3 4 RGB Color Performance RGB Color Intensities Contrast of each R G B color should be normal...

Page 21: ...cal Thickness Pattern Figure 3 R Color Pattern Figure 4 G Color Pattern Figure5 B Color Pattern Figure 6 Full White Patter Figure 7 Dark Screen Pattern Figure 8 18 ViewSonic Corporation Confidential D...

Page 22: ...sure it can pass test program 1 5 5 Fine Tune and Sharpness Test Signal 1280 1024 60Hz Test Pattern Line Moire Pattern Check and see if the image has noise and focus performs well Eliminate visual li...

Page 23: ...Test Pattern liberty Make sure there is audio output Make sure that audio function volume 80 is working without noise and resonance Make sure that the sound of right and left speakers are in balance...

Page 24: ...ware Upgrade VGA Cable PC Personal Computer LPT Cable Firmware Upgrade Program One additional monitor for checking the program execution Printer Port VA905 PC LPT Cable VGA Cable 2 2 Setup Procedure 2...

Page 25: ...3 ISP Download program procedure 3 1 Hardware Connect status 3 2 Down load isp program Step 1 Execute ISP exe 22 ViewSonic Corporation Confidential Do Not Copy VA905...

Page 26: ...MCU It need to be selected the MTV312MV64 for this project Then press the Creat Security File Button to enter step 3 Step 3 Creat Security File Enter the three string into the blank like fig 2 Then p...

Page 27: ...ess the Load MCU File button to select the file will be download hex Step 5 Run Pressing the Run Button to start download program Press OK button to Enter ISP mode 24 ViewSonic Corporation Confidentia...

Page 28: ...ween ISP status and Monitor Turn off the power of monitor AC plug off and disconnect the D Sub connector To connect the D Sub connector and then turn on the power of monitor AC plug on If the test res...

Page 29: ...ou find the DDC does not conform to the monitor you have to do the DDC key in 4 1 Equipment Needed VA905 Series Monitor DDC Card PC RS232 cable DVI DVI Cable Barcode Reader VGA Cable VA905 DDC Card PC...

Page 30: ...board port 3 Connect RS 232 Cable and VA905 with VGA Cable 4 when key in DVI DDC information use VGA transform to DVI port 5 Connect Power Cord to VA905 Monitor 4 3 DDC Key In Procedure 1 Run DDC exe...

Page 31: ...ter DDC 2B test interface Choose DDC Card 4 Press F8 to choose corresponding model DAT VA905_A DAT press ENTER key VA905_A means the DDC under analog mode VA905_D means the DDC under digital mode 28 V...

Page 32: ...Press F9 enter the download interface 6 Key in the serial number or use the barcode reader to scan the barcode of the monitor and press ENTER key 29 ViewSonic Corporation Confidential Do Not Copy VA90...

Page 33: ...essful picture is as follows Compare EDID OK Press any key to continue 8 Let VA905 active then see the information in OSD it shows Serial NO PTS052101075 30 ViewSonic Corporation Confidential Do Not C...

Page 34: ...ViewSonic EDID Editor Connect the VA905 to PC with VGA Cable Excute the EDID Editor then Press Ctrl F5 If the DDC is correct you can see the information as follow 31 ViewSonic Corporation Confidentia...

Page 35: ...itor Philips Screw Driver 101 and 107 Electronic Hex VA905 VP02 PC Personal Computer with SXGA resolution and sound card Pattern Generator 2 Main Procedure Star Power on Power LED ok Is display perfor...

Page 36: ...tart Is screen black Change Power Board Change Main Board Change LCD Panel Is screen white Replug or Change FPC Cable Change Main Board Abnormal Color Change Main Board Change LCD Panel 1 Yes No No Ye...

Page 37: ...ne Tune Sharpn ess or Auto Adjustment Refer to Notice 2 Change Main Board Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No No No No No No No No No No No No No...

Page 38: ...oubleshooting No Yes Start Change Control Board Change Main Board End Yes 2 4 D Speakers Troubleshooting Start Change Speakers Change Power Board End No Yes Yes 35 ViewSonic Corporation Confidential D...

Page 39: ...GUARANT CARD VIEWSONIC VA905 QSG DC 00003180 2002310472 6P84 1 13 LCD PANEL RA HSD190ME12 A02 A 12ms HSD E 00003181 2212006305 V901 1 14 LCD PANEL RB HSD190ME12 A02 A 12ms HSD E 00003182 2212006303 V9...

Page 40: ...M LB 0813 0856 2055613379 LABEL ViewSonic CONTAINER LABEL 6P11 21 36 M LB 0813 0530 2055617101 LABEL 10 20 HI POT TESTED 0K 6P13 1 37 M LB 0813 0959 2055613392 LABEL VSC HIGH VOLTAGE WARNING LABEL 6P1...

Page 41: ...CAP ELE 105 C EC 220u 16V 8 11 P 5 0 T C610 1 93 E C 0404 1838 2333610691 CAP ELE 105 C EC 10u 50V 5 11 P 5 0 T C615 1 94 E C 0404 4834 2300922401 CAP MTL MINI X2 0 22u 275V P 15 0 K C C801 C804 2 95...

Page 42: ...D808 1 140 N A 2363234012 DIODE RECT SR306 DO 201AD MOSPEC D820 1 141 N A 2363303200 DIODE SCHOTTKY SRF10150C ITO 220 MOSPEC D821 RB 1 142 N A 2363300500 DIODE SCHOTTKY FCH10A15 150V 10A TO 220AB IR...

Page 43: ...4P TOP P 2 5 OR EQUAL P601 1 198 N A 2405106000 EARPHONE JACK 2SJ P520 A04 577C SINGATRON P603 1 199 M MS 0808 9359 2427408252 WIRE HARNESS 8P H B 1061 26 L 250mm P 2 0 P701 1 200 N A 2407413300 SOCK...

Page 44: ...D 1 4WS 10 ohm J T52 R807 1 250 E R 0405 2818 2239224325 RES PRE 1 4 S RN 1 4WS 24 3Kohm F T R808 R824 2 251 E R 0405 3216 2233447095 RES CBN 1 4 S RD 1 4WS 47 00 J T52 MINI R809 1 252 N A 2235427806...

Page 45: ...E 00003182 2212006303 LCD PANEL HSD190ME12 A02 A 12ms HSD V901 RA 1 283 N A 2391301081 SPEAKER ASS Y 1W 8ohm 52 19 5 14 R W601 1 284 N A 2391301082 SPEAKER ASS Y 1W 8ohm 52 19 5 14 L W602 1 285 E X 04...

Page 46: ...B ASS Y 4 19 W601 20 W602 15 X4 13 12 14 X4 6 5 P985 10 11 X4 7 X4 8 9 16 21 X2 18 X2 X2 17 X4 27 26 X6 28 29 X2 30 X2 31 X2 2 3 22 X5 23 X3 24 X4 25 V901 NOTE 1 FIG 2 32 43 ViewSonic Corporation Conf...

Page 47: ...100 METAL FITTG JT198QP SECC 0 8T DVI 198 1 1 17 M SCW 0824 6941 2080005000 SCREW SPE M3 8 CAMERA SCREW NI NY10K 2 18 M SCW 0824 6942 2080005100 SCREW SPE M3 6 CANERA SCREW BLACK NY10K 2 19 M 00003200...

Page 48: ...tor Figure 3 1 4 Place the monitor into the carton and then put all the accessories into the carton At last close the carton and seal it with tape Figure 4 Figure 3 Figure 1 Figure 2 Figure 4 Power co...

Page 49: ...ure 1 Disassembly of Stand Hinge unit from Monitor 1 1 Detach Stand Unit from the monitor 1 2 Remove the Dust cover 1 3 Unscrew four screws that secure Hinge Unit 46 ViewSonic Corporation Confidential...

Page 50: ...sembly of Front Cover and Rear Cover 2 1 Unscrew three screws that secure Rear Cover to remove Front Cover 2 2 Unscrew five screws to remove Rear Cover 47 ViewSonic Corporation Confidential Do Not Cop...

Page 51: ...ew 2 screws to remove Shielding Plate Shielding Plate 3 2 Unscrew 6 screws 2 hexagon screws and disconnect the wires to remove Main Board 3 3 Unscrew 6 screws and disconnect the wires to remove Power...

Page 52: ...unscrew 4 screws on its right and left sides to remove Panel Unit Panel Unit 3 5 Unscrew 2 screws to remove Key Pad and remove the Speaker Panel Bracket Keypad Board Speaker 49 ViewSonic Corporation...

Page 53: ...2 3 3V I102 SCALAR 1 8V I108 Y I104 EEPROM VGA DVID P103 VGA5V VGA D SUB R G B INPUT P102 MCU 5VMCU Q105 Q106 H V SYNC I101 I801 SW power INPUT SPEAKER P601 AUDIO INPUT P102 Q104 P603 SCL SDA SYNC I10...

Page 54: ...17 3 3 1 3 2 4 GND IN VO VO C111 1u C105 220uF 16V R208 NC 1206 C112 1u C110 47uF 16V C109 47uF 16V Q104 MMBT3904 C B E C106 1u R101 1K Q106 MMBT3906 3 2 1 I101 RC1117 1 8 1 3 2 4 GND IN VO VO C107 1u...

Page 55: ...1u R130 NC R116 75 R111 NC C115 047u D107 1N LL4148 1 2 R133 100 R127 22 0603 D108 5V6 C232 22pF 0603 D120 5V6 D121 5V6 R122 NC R123 NC I103A 74LVC14 SO 14 1 2 14 7 I103B 74LVC14 SO 14 3 4 14 7 D104 1...

Page 56: ...DA SCL HWRESETZ INT PWM0 PWM1 LVACKM AVDD AVDD_MPLL AVDD_DVI BYPASS AVDD_DVI VDDP VDDP VDDP VDDP VDDP VDDP VDDP VDDC VDDC VDDC VDDC AVSS_DVI AVSS AVSS_MPLL AVSS_LPLL AVSS_PLL AVSS_DVI GNDP GNDP GNDP G...

Page 57: ...B6 RXOC PA3 RXE1 PB0 RXO0 PB2 RXO1 PB 0 9 PA 0 9 VLCD P105 CONN15x2 TO PANEL 1 3 7 19 16 13 11 9 30 28 17 26 23 21 2 4 6 14 18 15 12 10 8 29 27 24 25 22 20 5 PVCC PVCC GND RXO0 RXEC RXE2 RXE1 RXE0 RXO...

Page 58: ...70 P109 1 2 3 4 R161 2 2K R178 470 R173 1u Q108 MMBT3906 3 2 1 I106 MTV312M64 12 11 7 19 17 18 20 21 22 23 24 25 3 2 1 42 41 40 33 32 31 30 9 26 27 28 29 8 10 14 13 4 38 39 5 6 16 15 34 35 36 37 43 44...

Page 59: ...MEF R607 47 R610 47 I601 TDA8944AJ 9 7 6 4 8 11 16 10 12 17 14 15 13 3 2 1 5 IN2 SGND IN1 OUT1 IN1 SVR VCC2 STBY IN2 OUT2 OUT2 GND2 VOLUME VCC1 GND1 OUT1 NC L605 3 5X9X0 8 C609 4 7nF C612 4 7nF SOCKE...

Page 60: ...K 1 0805 R829 12K 1 0805 R827 NA R825 82K 1 0805 R866 27K 1 0805 R865 NA R824 0 OHM 0805 R808 680 0805 Q806 PMBS3906 SOT23 I804 FP5001 5 4 3 2 1 8 7 6 SCP FB Comp Vcc Vo GND RT DTC C818 0 1UF 0805 Q80...

Page 61: ...7 8 Si4532A SMD I905 1 2 3 4 5 6 7 8 R932 430 1 0805 D912 DAN217U SOT23 3 1 2 P902 SM02B BHSS 1 1 2 P904 SM02B BHSS 1 1 2 D910 1N4148 SMD R927 430 1 0805 R926 1M 0805 C925 0 1uF 0805 D913 1N4148 SMD R...

Page 62: ...11 1 MAIN PCB TOP VIEW 11 PCB Layout Diagrams 11 2 MAIN PCB BOTTOM VIEW 59 ViewSonic Corporation Confidential Do Not Copy VA905...

Page 63: ...11 3 KEYPAD PCB TOP VIEW 11 4 KEYPAD PCB BOTTOM VIEW 60 ViewSonic Corporation Confidential Do Not Copy VA905...

Page 64: ...11 5 POWER PCB TOP VIEW 61 ViewSonic Corporation Confidential Do Not Copy VA905...

Page 65: ...11 6 POWER PCB BOTTOM VIEW 62 ViewSonic Corporation Confidential Do Not Copy VA905...

Page 66: ...uality Systems Processes marc maupin viewsonic com d o o G t n e l l e c x E Precautions and Safety Notices 1 8 Exploded Diagram and Exploded Parts List 7 Recommended Spare Parts List Adjustment Proce...

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