ViewSonic A90f+ 1 User Manual Download

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Service Manual

ViewSonic

+-1

Model No. VCDTS2

307-2R

” Digital Controlled Color Monitor

(

f+-1_SM_602-Rev. 1.0-October 2002)

ViewSonic

381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

Summary of Contents for A90f+ 1

Page 1: ...Service Manual ViewSonic A90f 1 Model No VCDTS23307 2R 19 Digital Controlled Color Monitor A90f 1_SM_602 Rev 1 0 October 2002 ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800 888 8583...

Page 2: ...the contents hereof 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 change...

Page 3: ...9 5 General Connections applications 11 6 Electronic Circuit Description 13 7 Adjustment 19 8 Troubleshooting Flow Chart 28 9 Recommended Spare Parts List 35 12 PCB Layout 54 13 Schematic Diagram 57 1...

Page 4: ...ng or generally handing the picture tube People not so equipped should be kept at a safe distance when any such handing is being undertaken Do not handle the picture tube by the neck of deflection coi...

Page 5: ...on After test R176 should be adjusted back to normal 25 9KV CAPACITOR C850 400V 4700PFM CAPACITOR CERAMIC 5230105501 C851 400V 4700PFM CAPACITOR CERAMIC 5230105501 C135 250V 33UFM CAPACITOR ELECTROLYT...

Page 6: ...tness adjustment 1 2 Key As a select key go to next sub menu User controls UltraBrite Mode Key As a select key go to High Bright Display mode Signal connections Standard Model 1 8 m signal cable with...

Page 7: ...14 269 12 712 1 112 0 064 25 175 MAC 640X480 3 35 0 66 667 Composit e Negative 28 571 21 164 3 175 2 116 15 13 714 1 114 0 086 30 24 640X480 4 37 5 75 26 667 20 317 3 81 2 032 13 333 12 8 0 427 0 080...

Page 8: ...n and Functions Power switc Led indicator Up 2 key Down 1 key Power switch Auto Sizing Front view Rear view UltraBrite Mode UltraBrite Mode 15 pin D Sub AC input ViewSonic Corporation 5 Confidential D...

Page 9: ...gh Brightness Key UltraBrite Mode this key will be effective only after switching on monitor not in preset state Pressing this key will switch normal brightness to high brightness The next pressing wi...

Page 10: ...o the first item or down to the last item then the next bar moving will enter main menu 2 as below for other adjustment FIGURE 2 USER MODE OSD MENU 2 In main menu 2 if VIEWMATCH COLOR is selected then...

Page 11: ...isplay next sub menu as below for languages selection If view meter is selected then pressing 2 key will display next sub menu as below to display timing information VIEWMETER Normal brightness High b...

Page 12: ...wn to release the snap on lock then remove the back cover Fig 4 4 Caution When servicing or replacing the CRT disconnects the anode and discharges the anode shield completely As high voltage 25KV may...

Page 13: ...ctor e Remove the PC main board from the chassis guide of the front cover Fig4 6 4 CRT Removal a CRT is supplied as ITC b Remove 4 screws F from the front cover Fig4 7 to move the CRT CAUTION Do not l...

Page 14: ...are shown below 15 Pin Min D sub male connector PIN NO PIN DESCRIPTION 1 RED 2 GREEN 3 BLUE 4 NO CONNECTION 5 GROUND 6 R GROUND 7 G GROUND 8 B GROUND 9 5V PC97 10 GROUND 11 NO CONNECTION 12 SDA FOR D...

Page 15: ...unit Connect the blue colored video signal cable D sub connector to the signal connector on the graphics board VGA connector on your computer See your system user s guide for the exact location of yo...

Page 16: ...perate for a few seconds before SR801 returns to open Degaussing also can be operated in the OSD menu 6 1 2 5 UC3842 PWM controller UC3842 is a current feedback PWM controller Pin1 is feedback positiv...

Page 17: ...and pin 42 The control tables are as follows Off mode When both sync Signals or one of the sync Signals are absent IA01 will send a low logic at pin 23 and pin21 to turn off Q811 Q812 The secondary vo...

Page 18: ...sor By I2 C bus pin29 30 SDA SCL it can communicate with IA01 MCU H sync and V sync come from pin41 42 of IA01 to pin1 and 2 of I301 When the H Freq is over 89 kHz or below 28 kHz I301 will shut down...

Page 19: ...h d 58kHz ON OFF OFF ON OFF 45 fh d 49 5kHz ON OFF ON ON OFF 40 fh d 45kHz ON ON ON ON OFF 36 fh d 40kHz ON OFF ON OFF ON 32 fh d 36kHz ON ON OFF ON ON d 32 kHz ON ON ON ON ON 6 3 3 SUPPLY VOLTAGE CON...

Page 20: ...from deflection circuit via Q111 Q121 Q124 are high voltage output switches T101 provide the high voltage 25 9KV to CDT anode Pin13 of T101 provides feedback to pin2 of I101 to control the duty when...

Page 21: ...I901 will have the level darker than the video black level during the horizontal retrace time Pin 20 and 21are I2 C input for MCU IA01 to control video By IIC bus MCU will initiate I901 and control th...

Page 22: ...rightness adjustment R176 High voltage setting R454 Raster center R827 B 82V setting R817A Set power supply working frequency R319A Set 35k 66 7hz H SIZE over bezel 2mm Degauss To degauss function Ent...

Page 23: ...roma 2225 signals with full white pattern to the monitor b Connect AC input and power on the monitor c Brightness at center contrast at maximum d Adjust preset Horizontal and vertical size e Set R G B...

Page 24: ...or DOWN Key and adjust Video display to 352 1mm Every Mode 352 2 mm 3 Raster center adjustment Mode Mode 13 1280 x 1024 75Hz Pattern Black only background visible Brightness raster visible Adjust R454...

Page 25: ...con 2 Pressing UP or DOWN Key and adjust orthogonality to get the best b Parallelogram Adjustment Every Mode 2 b Parallelogram Adjustment 1 Select Parallelogram Icon 2 Pressing UP or DOWN Key and adju...

Page 26: ...Mode 2 e Pin corner Adjusts a Select Top Bottom Pin corner Icon b Press UP or DOWN Key to adjust 9 Brightness Brightness set at Center Brightness Center 10 Contrast Contrast set at Max Contrast Max V...

Page 27: ...0 003 y 0 297 0 003 x 0 283 0 005 y 0 297 0 005 b 6500qK Su65 Background White Balance Mode 13 1280 x 1024 Pattern 11 Black pattern Brightness 95 Contrast max Select Color Icon Select 6500qK Su65 1 R...

Page 28: ...FL Samsung High brightness Sup93 Y 83 2 FL Test point CRT center e 6500qK Su65 Gain Adjustment Mode 13 1280 x 1024 79 975K 75 HZ Pattern x 5 62 w x 58 h mm White block Adjust brightness 0 08 0 01 F L...

Page 29: ...l brightness 5000K Y 41 2 FL High brightness Sup50 Y 70 2 FL Test point CRT center 12 1 Focus Adjustment 12 2 Vert Focus 1a Mode 13 1280 x 1024 Pattern Nokia focus Pattern Brightness 0 08FL Contrast M...

Page 30: ...Mode 1280 x 1024 75HZ Full White pattern 1 H Moir set at 0 V Moir set at 25 for each preset mode ITC Samsung M46QCK761X123 TCO MDT 2 Check a Mode 10 1024 x 768 b Mode 8 800 x 600 c Mode 1 640 x 480 B...

Page 31: ...ECTION 1 No power Fuse open Check R807 R831 Q801 Check Q433 Q402 Check Q121 Q124 FBT T101 Check D816 D817 D815 D850 D819 D818 short NO YES NO Check D801 D802 D803 D800 NO NO ViewSonic Corporation 28 C...

Page 32: ...NO Power on again to check if any message on screen No Check signals from PC YES Check if XA01 waveform exist NO YES Replace MCU IA01 Check B 5V to IA01 exist NO Check IA01 sync input pin41 and pin42...

Page 33: ...heck I101 pin1 3 6V approx pin2 2 5V approx NO Check OVP CKT setting build by Q114 115 116 Check 82V at pin2 of FBT T101 YES Check CRT R G B cathode and G1 Is the voltage 6 3V at heater YES Check P904...

Page 34: ...e No Raster High Voltage exist Replace T101 FBT I301 Pin3 HUNLOCK HIGH P401CONNECTION proper YES No NO YES Check I2 C bus from Pin27 28 of IA01 to IA02 I301 I901 Check IA01 and its peripheral CKT NO N...

Page 35: ...90Vapprox NO Is waveform at Drain of Q402 Proper Is output of Q400 Q421 proper YES NO NO Is output at Pin 28 of I301 proper NO YES Q433 output proper NO NO Is Q404 output proper Is output at Pin 26 of...

Page 36: ...tput Check I310 short Check S M P S DC output I310 Pin1 Pin7 Input proper Are there output at pin 3 5 of I301 Check I301 AND Peripheral CKT YES NO NO NO Pin 2 of I310 15 V approx Pin4 of I310 15 V app...

Page 37: ...ck I903 and its peripheral circuit YES No video Raster exist Check OSD I903 Check if Contrast is too low YES NO Check R G B at CDT socket Check I904 R G B input NO Check 82V 193V for I904 and their pe...

Page 38: ...1011333 ZENER IN5252B 23 6 24 7V D826 E D 0403 0649 6615023331 ZENER IN5252B 23 6 24 7V ZENER HZ24 2 F801 E FS 0410 0059 5054431539 FUSE T 250V 3 15A FUSE I101 I803 E IC 0401 0277 6644063111 IC UC3842...

Page 39: ...86 E R 0405 6786 5130456903 5 6ohm 2W METAL R389 E R 0405 6701 5130418903 1 8ohm 2W METAL R402 5130547003 47ohm 3W METAL R415 5130515002 15ohm 3W METAL R454 E R 0405 6791 5162561980 10Kohm VR T5X2 5 R...

Page 40: ...3352 5276110491 C ME 100V 0 1UF J C107 E C 0404 4377 5205647991 C EL 50V 4 7UF M C108 E C 0404 4374 5213601091 C EL 50V 1UF M C109 E C 0404 4137 5236310491 C BL 50V 0 1UF Z C110 E C 0404 4140 52313102...

Page 41: ...ME 63V 0 1MF J C321 E C 0404 4389 5275110491 C ME 63V 0 1MF J C322 E C 0404 4131 5232310291 C CE 50V 1000PF J C325 E C 0404 4374 5213601091 C EL 50V 1UF M C382 E C 0404 2896 5213310191 C EL 16V 100UF...

Page 42: ...1KV 100PF K C825 E C 0404 0226 5216410101 C EL 250V 100UF M C826 E C 0404 3909 5233318191 C CE 1KV 180PF K C827 E C 0404 4355 5214019812 C EL 100V 220UF M C828 E C 0404 4286 5213647091 C EL 50V 47UF M...

Page 43: ...0403 1999 6615009336 DIODE ZENER HBZX79C 10 D110A RB E D 0403 2000 6615009337 HZ11A3 TD D111 E D 0403 2005 6615012530 DIODE ZENER HZ4A2 TD 3 5 3 7V 5mA 0 5w D112 E D 0403 1751 6613003032 DIODE SWITCHI...

Page 44: ...RECTIFIER UF5402G D817 RB E D 0403 1866 6611018200 DIODE RECTIFIER 30DF2 D817 RC E D 0403 1990 6611015245 DIODE RECTIFIER GUF30D D818 RA E D 0403 1842 6611015244 DIODE RECTIFIER UF5402G D818 RB E D 0...

Page 45: ...GULATOR L8712 12V 1 5A I871 RC E IC 0401 2321 6640002006 IC VOLTAGE REGULATOR L8712BE12V 1 5A I871 RD E IC 0401 2320 6640002003 IC VOLTAGE REGULATOR L8712API 12V 1 5A IA01 RA E IC 0401 2416 6647008204...

Page 46: ...24 6623002050 TRANSISTOR PNP 2SA1015Y Q430 E Q 0402 1360 6621015332 TRANSISTOR NPN 2SC1815Y Q433 E Q 0402 1463 6621002801 TRANSISTOR NPN HF BU4525AX Q471 E Q 0402 1461 6623006332 TRANSISTOR PNP HF KTA...

Page 47: ...21 6295 R CF 1 6W 1 6K J R118 E R 0405 2376 5142815295 R CF 1 4W 1 5K J R119 E R 0405 3090 5142810195 R CF 1 4W 100K J R120 E R 0405 6922 5130451303 R MOF 2W 51K J R121 E R 0405 6788 5142415590 R CF 1...

Page 48: ...6518 5142110195 R CF 1 6W 100 J R316 E R 0405 6518 5142110195 R CF 1 6W 100 J R317 E R 0405 6525 5142110295 R CF 1 6W 1K J R318 E R 0405 6548 5142143295 R CF 1 6W 4 3K J R319 5142875395 R CF 1 4W 75K...

Page 49: ...E R 0405 5952 5130410303 R MOF 2W 10K J R812 E R 0405 5952 5130410303 R MOF 2W 10K J R813 E R 0405 5961 5130510403 R MOF3W 100K J R814 E R 0405 3199 5142851995 R CF 1 4W 5 1 J R815 E R 0405 3090 51428...

Page 50: ...CF 1 6W 100 J RA13 E R 0405 6518 5142110195 R CF 1 6W 100 J RA14 E R 0405 6540 5142133195 R CF 1 6W 330 J RA15 E R 0405 6525 5142110295 R CF 1 6W 1K J RA16 E R 0405 6908 5142127095 R CF 1 6W 27 J RA18...

Page 51: ...0417 0088 5202200591 SPARK GAP 1 2KV 1PF MAX Z803 E SP 0417 0090 5202201991 SPARK GAP 200V 1PF MAX 2805 E SP 0417 0090 5202201991 SPARK GAP 200V 1PF MAX Z809 E SP 0417 0088 5202200591 SPARK GAP 1 2KV...

Page 52: ...7201 C CE 1KV 4700PF M C926A E C 0404 1871 5233310191 C CE 1KV 100PF K C926B E C 0404 3909 5233318191 C CE 1KV 180PF K C927 E C 0404 4326 5231310391 C CE 50V 10000PF K C930B E C 0404 1118 5242210191 C...

Page 53: ...5 COIL PEAKING TRF 8568M 0 56UH M L951 E L 0407 1505 5062122902 CORE BEAD BL03RN2 R62T4 L953 E L 0407 1510 5064010029 COIL PEAKING TRF 3100J 10UH J L965 E L 0407 1393 5062122946 CORE BEAD PH03506AT B...

Page 54: ...100 J R930 E R 0405 6941 5130527903 R MOF 3W 2 7 J R931 E R 0405 6559 5142175095 R CF 1 6W 75 J R934 E R 0405 5819 5142833095 R CF 1 4W 33 J R935 E R 0405 6223 5142182295 R CF 1 6W 8 2K J R935A E R 04...

Page 55: ...0V 1PF DSP 301N C04F Z914 RA E SP 0417 0090 5202201991 SPARK GAP DC200V 1PFDSP 20 1M C04F Z914 RB E SP 0417 0089 5202201301 SPARK GAP DC200V 1PFGD412 200V M Z944 RA E SP 0417 0090 5202201991 SPARK GAP...

Page 56: ...o p stage LED CKT High Voltage control High Voltage Driver FBT Heater Control B Control Driver X ray Protect Dynamic Focus CKT Degauss Degauss Control EMI Filter PWM Controller Frequency reduction Pro...

Page 57: ...12 PCB Layout ViewSonic Corporation 54 Confidential Do Not Copy A90f 1...

Page 58: ...VIDEO PWB 0414 ViewSonic Corporation 55 Confidential Do Not Copy A90f 1...

Page 59: ...KEY CONTROL PWB 0488 ViewSonic Corporation 56 Confidential Do Not Copy A90f 1...

Page 60: ...MAIN BOARD 13 Schematic Diagrams ViewSonic Corporation 57 Confidential Do Not Copy A90f 1...

Page 61: ...VIDEO ViewSonic Corporation 58 Confidential Do Not Copy A90f 1...

Page 62: ...KEY CORTROL ViewSonic Corporation 59 Confidential Do Not Copy A90f 1...

Page 63: ...POWER SUPPLY CKT ViewSonic Corporation 60 Confidential Do Not Copy A90f 1...

Page 64: ...MCU CONTROL CKT ViewSonic Corporation 61 Confidential Do Not Copy A90f 1...

Page 65: ...Time Base DeflectionCKT ViewSonic Corporation 62 Confidential Do Not Copy A90f 1...

Page 66: ...H V DYNAMIC FOCUS CKT ViewSonic Corporation 63 Confidential Do Not Copy A90f 1...

Page 67: ...14 Exploded Diagram ViewSonic Corporation 64 Confidential Do Not Copy A90f 1...

Page 68: ...00 1 M14 M MS 0808 8291 TILT FRAME A90F 5641406010 1 M15 PL TB 0717 0111 SWIVEL DISH A90F 5641406110 1 M16 PL PS 0715 0170 BASE A90F 5641409603 1 M17 M CV 0830 2334 USB COVER A90F 5642314903 1 M18 PL...

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