ViewSonic VCDTS23283 Service Manual
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ViewSonic VCDTS23283 Service Manual

ViewSonic VCDTS23283 Service Manual

19” digital controlled color monitor
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Service Manual

ViewSonic A91f+-1
Model No. VCDTS23283
19" Digital Controlled Color Monitor
(A91f+-1_SM_830 Rev. 1a – Apr. 2004)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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Summary of Contents for ViewSonic VCDTS23283

  • Page 1: Service Manual

    Service Manual ViewSonic A91f+-1 Model No. VCDTS23283 19” Digital Controlled Color Monitor (A91f+-1_SM_830 Rev. 1a – Apr. 2004) ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583...

  • Page 2: Revision History

    Further, ViewSonic reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or changes.

  • Page 3: Table Of Contents

    4. Circuit Description 5. Adjusting Procedure 6. Trouble Shooting Flow Chart 7. Recommended Spare Parts List 8. Exploded Diagram And Spare Parts List 9. Block Diagram, Schematic Diagrams 73-78 10. PCB Layout Diagrams Confidential - Do Not Copy ViewSonic Corporation A91f+-1...

  • Page 4: Precautions And Safety Notices

    (as shown in Fig.1). Use an AC voltmeter with 1000 ohm/volt or more sensitivity and measure the AC voltage across the combination 1500 ohm resistor and 0.15uF capacitor. Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 5 X-RADIATION, shock, fire, or other hazards. Do not modify the original design or this will void the original parts and labor guarantee. Confidential - Do Not Copy ViewSonic Corporation A91f+-1...

  • Page 6: Specification

    B RETURN 2.2.6 SIGNAL MEMORY MODES 13 PRESET MODES 2.2.7 PLUG & PLAY VESA DDC1 / 2B 2.3 SCANNING FREQUENCY 2.3.1 HORIZONTAL 30 KHZ TO 86KHZ 2.3.2 VERTICAL 50 HZ TO 180 HZ Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 7 OSD H-POSITION / OSD V-POSITION INPUT LEVEL MANUAL DEGAUSS TOP/BOTTOM HOOK / RESET MEMORY RECALL 3.3 LED INDICATION STATUS NORMAL GREEN POWER ON POWER SAVING AMBER OVER RANGE FREQUENCY AMBER POWER OFF Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 8 POWER SAVING AMBER 10 SEC < 5 W POWER SAVING AMBER 10 SEC < 29 KHZ OR < 49 HZ OR < 5W FREQUENCY OVER 10 SEC AMBER > 87KHZ >181 HZ RANGE Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 9 4.7 PICTURE DISTORTION 4.7.1 TRAPEZOID / PARALLELOGRAM 357mm TRAPEZOID: HORIZONTAL <= 2mm 268mm VERTICAL <= 2mm PARALLEL <= 2mm PICTURE 4.7.2 PINCUSHION / BARREL / PIN-BALANCE PINCUSHION < BARLEL < 1.5mm PICTURE Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 10 Y AT CONTRAST 25.75 FL - Y AT 10 FL < 0.009 4.11.4 VIDEO AMPLIFIER LINEARITY INPUT STEP AT 9300 x 600mV – x 700mV < 0.007 y 600mV – y 700mV < 0.003 Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 11 BLACK W HITE PICTURE PICTURE BEZEL BEZEL 4.14.2 DYNAMIC REGULATION PICTURE GROWTH SHALL BE LESS THAN 1 mm WHEN PICTURE IS EXCHANGED FROM < 1 mm 100mm BLACK 100mm W HITE 370mm Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 12 - 5/+15 DEGREES SWIVEL ± 90 DEGREES PACKAGING 6.3.1 CARTON DIMENSION HEIGHT 498 mm WIDTH 557 mm DEPTH 577 mm 6.3.2 SHIPPING WEIGHT 22.4 KG 6.3.3 CONTAINER LOADING 320 UNITS WITH PALLET Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 13 2.40V MIN. 3.5V NOM. 5.5V MAX. TIMING OF INPUT SIGNALS H-TOTAL TIME V-TOTAL TIME H-SYNC PULSE WIDTH V-SYNC PULSE WIDTH H-BACK PORCH V-BACK PROCH H-DISPLAY TIME V-DISPLAY TIME H-FRONT PORCH V-FRONT PORCH Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 14 R V.ACTIVE (MS) 15.254 12.711 11.093 12.800 15.880 11.179 12.795 (LINES) (480) (400) (480) (600) (768) (600) (768) S V.FRONT PORCH (MS) 0.318 0.222 0.023 0.021 0.06 0.017 (LINES) (10) SCANTYPE INTERLACED Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 15 (39) (30) R V.ACTIVE (MS) 11.183 (768) 12.804 16.000 13.714 12.552 (624) 12.749 (LINES) (1024) (1200) (480) (768) S V.FRONT PORCH (MS) 0 (0) 0.013 0.013 0.086 0(0) 0.05 (LINES) SCANTYPE INTERLACED Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 16 EDID DATA for SAMSUNG CRT TIME: 09:20:50 DATE: FEB 12, 2004 VIEWSONIC CORPORATION EDID VERSION # 1, REVISION # 3 DDCTEST FOR: VIEWSONIC A91F+ 128 BYTES OF EDID CODE FOR SAMSUNG CRT _____________________________________________________ ________________________________________ ____ 1D 24 BB B8 40 A9...

  • Page 17: Front Panel Function Control Description

    Adjustment control button：▽﹑△﹒ Control name﹒ 1﹒Power switch：Push-on / push-off switch for soft power control﹒ 2﹒LED indication﹒ Status Power on Green Off mode in 5 sec Orange Over range freq. Orange Power off Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 18 V. size / Position. Pincushion / Balance. Trapezoid / Parallel. Top/Bttom Hook. ZOOM Tilt . Main menu, Part 2. Degauss H/V Moire. OSD Position. Input Level. View match color. Language. View meter. Memory Recall. Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 19 PARALLEL (parallelogram) slants vertical edges of the screen to the left or right. slants vertical edges to left, slants vertical edges to right. Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 20 ▽ move OSD to left side, △ move OSD to right side ﹒ OSD V-Position control Press the ▽ , △ button. △ move OSD to up, ▽ move OSD to down. INPUT LEVEL displays the voltage level of the video signal. Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 21 : 25 seconds Pull-in range Back ground : Blue H . V F R E Q U E N C Y Characters : White O V E R R A N G E Confidential - Do Not Copy ViewSonic Corporation A91f+-1...

  • Page 22: Circuit Description

    （IC301 pin18）are at low level voltage﹒That is, there is no output for 12V and 6.3V﹒ Degauss﹒ When the powers is on and when press manual degauss﹐IC301 pin20 output high level voltage to turn on Q201﹐RL101 and activate Degauss﹒ Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 23 H-output circuit use﹐As H-freq. change﹐IC401 pin28 B -driver will change its output﹐Booster converter will also change the B it provides﹐H-freq. will varies from 30K ~ 86KHz﹐B+ will varies from 40V ~ 180V﹒ Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 24 2. Q4401 High voltage output stage. 3. Q4402 PWM control Driver stage. 4. Q4407.Q4408 .and Q4410 Brightness control circuit . 5. Q4406 D4426.R4429.R4430.VR4402 andC4427. ABL control circuit. 6. VR4401 High voltage control. 7. VR4402 ABL Lever control. Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 25 0 to 12V﹐As Q211 will turn on gradually﹐the current starts from 14V to 6.3V via Rotate coil﹒ When C215decrease from 12V to 0V﹐the current will change from 6.3V to GND﹒ Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 26 Key Control﹕IC301 pin26~pin29 function as DAC switch input to control OSD display function﹒ Pin26： ﹒ Pin27：▽﹒ Pin28：△﹒ Pin29： ﹒ C Bus﹒ IC301 have two groups I C bus to control E PROM﹐IC401 deflection IC﹐Auto aliment﹐IC601 pre-AMP﹐ IC602 OSD IC function﹒ Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 27 Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 28 (10) (11) (12) Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 29 (13) (14) (15) (16) (17) (18) Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 30 (19) (20) (21) (22) (23) (24) Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 31 (25) (26) (27) (28) (29) (30) Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 32 (31) (32) (33) (34) (35) (36) Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 33 (37) (38) (39) (40) (41) (42) Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 34 (43) (44) (45) (46) (47) (48) Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 35 (49) (50) (51) (52) (53) (54) Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 36 (55) (56) (57) (58) Confidential - Do Not Copy ViewSonic Corporation A91f+-1...

  • Page 37: Adjusting Procedure

    Discharge of CRT anode should be done only to CRT ground strap﹒ Geometric measurements assumed to be made along a straight surface with a flat rule or template﹒ Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 38 264mm Picture Centering﹒ Input mode 1~9 adjust V-position﹐ Picture Bezel H-position such that the picture is centered with the screen﹒ lA – Bl < 4mm lC – Dl < 4mm Picture Bezel Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 39 Pinchshion ≦ 1mm (A’,B’,C’,D’) Barrel ≦ 1mm (A,B,C,D) Pincushion / Barrel distortion 3.4.3 Trapezoid and parallelogram distortion trapezoid / parallelogram≦1.5mm﹒ 352mm 264mm Picture Trapezoid / Parallelogram distortion 3.4.4 Rotate adjustment﹒ h < 2mm 264mm 352mm Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 40 ” and power switch on﹐the picture should restore to that of factory mode﹒ Focus Adjustment﹒ Apply signal ALL “ME” pattern at 1280*1024 80K mode﹒ Set Brightness 50%﹐Contrast 100%﹒ Set focus control for best focus﹒ Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 41 C﹒ PCB defined﹒ Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 42 ：Save color 6500K adjustment data Save color to 5000 ：Save color 5000K adjustment data Save geometry ：Save geometry adjustment data 2.10 Save all preset mode ：Save adjustment data to E PROM 2.11 Reset ：Monitor Reset Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 43 Get mode data Pull adjust ( 255 ~ 0) Change other mode Save color to 9300K Save color to 6500K Save color to 5000K Save geometry All mode adjust finish? Save all preset mode Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 44 & Power on key ： Into OSD service mode. Press & & Power on key ： Clear burn in flag. Press & & Power on key ： Set burn in flag. Press & Power on key ： All mode recall. Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 45 GT F S A V E G T F R C U T G C U T B C U T R D R V G D R V B D R V Confidential - Do Not Copy ViewSonic Corporation A91f+-1...

  • Page 46: Trouble Shooting Flow Chart

    Is the LED normal R112 normal R111, R112 Check horizontal Check video circuit and vertical circuit Are TP201~TP205 voltage normal Check D201, D203, D205, D206, Q203, Q208 Is the T101 normal Replace T101 Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 47 Horizontal drive is Is the waveform of Q401 defective T401, Q4401, "BASE" normal? 0.8Vp-p Horizontal output circuit is Is the horizontal output defictive Q407, D406, circut normal? C418, Q418, Q409 CRT is defictive Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 48 Heater voltage approx. 6.3V Turn the FBT screen clockwise Bright circuit Q4407, Does the entire screen Q4408, Q4410, IC301 light up? pin1 brightness control are defective FBT is defective Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 49 Is the IC501 pin2=13V 45Vp-p of IC501 normal? pin4=-11V? Is the waveform of IC401 Check the dflection Yoke pin21, pin23 normal? R502 is defective Are R502 normal? Check power supply +12V, -12V IC401 is defective Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 50 G1,G2 of CRT D206, G1, G2, FBT, D4410, socket normal? Q4410, Q4407, Q4408 and its Heater: 6.3VDC drive circuit G1: -38V G2: 660V The CRT is defective. Confidential - Do Not Copy ViewSonic Corporation A91f+-1...

  • Page 51: Recommended Spare Parts List

    3512264100 CARTON 557*577*498 K986SBM01C A91f+-1M 3 weeks A-CD-A91F+ 3532084600 CD-ROM A91f+-1M K986SBM01C 3 weeks M-MS-0808-9254 5011088201 MANUAL VIEWSONIC CRT ALL MODEL 3 weeks M-MS-0808-9679 3500910303 PE BAG 585*605*810 T=0.07 H996BFM23A 3 weeks B-MB-0201-2741 5600010607 M/V BD ASSY K986 SBM 01C...
  • Page 52 #N/A 3649110200 CRT GROUNDING WIRE K986 #N/A 4090001000 SOLDER WIRE 50/50 1.6mm 74 M-MS-0808-9254 5011088201 MANUAL VIEWSONIC CRT ALL MODEL 75 B-MB-0201-2741 5600010607 M/V BD ASSY K986 SBM 01C 76 E-R-0405-3090 13101000 RES CF 1/4W 100 J R467,R468,R619,R620, RD1/4WJ 101 T52...

  • Page 53: Viewsonic Corporation

    Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 83 E-R-0405-5690 13104800 RES CF 1/4W 100K J SMALL R121 RD16ST52 100K J 84 E-R-0405-3183 13105000 RES CF 1/4W 1M J R493 BCW4J0105 85 E-R-0405-5695 13106800 RES CF 1/4W 10M J SMALL...
  • Page 54 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 111040800 RES MF 1/4W 820 F SMALL R430,R433 168 E-R-0405-6304 111053800 RES MF 1/4W 5.6K F SMALL R507 169 E-R-0405-2854 111059000 RES MF 1/4W 10K F R428 SN1/4WT52F10K 170 E-R-0405-6082...
  • Page 55 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 251 E-C-0404-3654 1132945800 CAP CD 500V 1KP K Y5P TP5 C445 BC5102KG1H 252 E-C-0404-4484 1140024800 CAP CD 1KV 56P J C0G TP5 C208,C218 CHM8560JG1H 253 E-C-0404-4673 1140030800 CAP CD 1KV 100P J C0G TP5...
  • Page 56 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 335 E-C-0404-2986 1751571D06 CAP MP DP 250V .82U J KI15 C417 7U2E824J-ACE(PMS) #N/A 17D102AD06 CAP MP DP 1.5KVH 4.7KP J KI15 C401,C416 4U6T472J-ACE(PHS) 337 E-C-0404-3769 1950102101 CAP MY DP I 50V 4.7KP J TP5...
  • Page 57 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 420 E-Q-0402-1208 211105700006 TR -250V -0.05A 2-5F1B 50 Q419,Q420 BF423(TPE2) 421 E-Q-0402-0888 211106000106 TR -300V -0.05A TO-92 40 Q404 BF421(TPE2) 422 E-Q-0402-1588 211162030006 TR -40V -3A 2-8H1A 120-240 Q203,Q208 2SA1359-Y...
  • Page 58 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 504 M-MS-0808-5168 4090001800 SOLDER BAR 60/40 SB60 #N/A 4131101500 CORE FERI EER35L TP4 EER35L TP4 #N/A 4131105800 CORE FERI EER3542 JPP4 UI=2300 EER35/42 JPP4 #N/A 2816334410 CHOKE CD 100uH K...
  • Page 59 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 588 E-L-0407-1190 2922350506 COIL PEAKING .47uH K TP AXIAL 0307 L607,L608,L609 CP-0370AT-R47K #N/A 2970044301 PWB S0 FR-1(XPC) 250MM*330MM 590 M-SW-0815-0151 3000091800 SWITCH TACTILE DC 12V 50mA SW305 591 M-SW-0815-0176 3000091816...

  • Page 60: Exploded Diagram And Spare Parts List

    8. Exploded Diagram And Spare Parts List Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 61 A91f+-1 Exploded Parts List Item ViewSonic P/N Reference P/N Description 3361091600 F/B ABS BLK+SILVER A91F+S9PFC1AT C-FP-0301-1026 3360625100 POWER KNOB ABS 41 S7PFB1AT PL-NB-0707-0196 3360053201 LED HOLDER NY66 NAT M-MS-0808-4828 3462003900 SPRING COMPRESSION SUS304 ID6.5 L12 M-MS-0808-7806 3360728400 FUNCTION KEY ABS 41 S7PFB1AT...
  • Page 67 Confidential - Do Not Copy ViewSonic Corporation A91f+-1...
  • Page 82 Confidential - Do Not Copy ViewSonic Corporation A91f+-1...

  • Page 83: Block Diagram, Schematic Diagrams

    Add.: Fax: Tel: E-mail: After completing this form, please return it to ViewSonic Quality Assurance in the USA at facsimile 1-909-839-7943. You may also e-mail any suggestions to the Director, Quality Systems & Processes (marc.maupin@viewsonic.com) Confidential - Do Not Copy...

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A91f+-1

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