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Service Manual

ViewSonic G90fB-4

Model No. VS10794

19” Digital Controlled Color Monitor

(G90fB-4_SM Rev. 1a Jan. 2006)

ViewSonic

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

Summary of content (55 pages)

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Service Manual ViewSonic G90fB-4 Model No. VS10794 19” Digital Controlled Color Monitor (G90fB-4_SM Rev. 1a Jan.
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TABLE OF CONTENTS 1. Precautions and Safety Notices 1 2. Specification 3 3. Front Panel Function Control Description 6 4. Circuit Description 10 5. Adjusting Procedure 13 6. Trouble Shooting Flow Chart 17 7. Recommended Spare Parts List 22 8. Exploded Diagram And Spare Parts List 37 9. Block Diagram 39 10. Schematic Diagrams 46 11.
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Copyright Copyright © 2005 by ViewSonic Corporation. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of ViewSonic Corporation.
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1. Precautions and Safety Notices WARNING! This service information is designed for experience repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians.
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combination 1500 ohm resistor and 0.15uF capacitor. 5-4 Move the resistor connection to each exposed metallic part and measure the voltage. 5-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement. 5-6 Voltage measured must not exceed 7.5 volt RMS, from any exposed metallic part to ground A leakage current tester may be used in the above hot check, in which case any current measured must not exceed 5.0 milliamp. In the case of a measurement exceeding the 5.
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2. Specification 1. CRT : 46CM(19") 90 Deflection, Shadow mask ,29mm Neck, flat high contrast CRT, 0.21mm(H) / 0.25mm (D) dot pitch, Non-Glare Screen 2. Viewable image Size: 45.7CM (18") diagonal 3. Display Color: 4.
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10. Video Bandwidth: 240 MHz 11. Power Source: Switching Mode Power Supply AC 90 ~264V, 50/60Hz Universal Type 12. Operating Temperature: 0°C to 40°C Ambient 13. Humidity: 5% to 95% Relative, Non-Condensing 14. Weight: 18.0 kgs 15. Dimensions / 39.7 (lbs) (Net), 21.2 kgs / 46.7 (lbs) (Gross) Machine Package Width: 445 mm 540 mm Height: 424 mm(378mm w/o Base) 530 mm Depth: 465 mm 570 mm 16. External Connection: 15 Pin D-sub Connector AC Power Cord 17.
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Operating instructions This procedure gives you instructions for installing and using the Color display. 1. Position the display on the desired operation and plug the power cord into a convenient AC outlet. Three-wire power cord must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical conduit ground.
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3. Front Panel Function Control Description Adjusting the Screen Image Use the buttons on the front control panel to display and adjust the OSD controls .The OSD controls are explained at the top of the next page and are defined in “Main Menu Controls” on page 8.
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OSD Lock Settings You have the option of using the On Screen Display (OSD) locking feature, OSD LOCK, to prevent unwanted changes to the current image settings. • OSD Lock: Press and hold the [1] button on the face of the monitor for 10 seconds. The message "OSD LOCK" will then display briefly, indicating that the OSD image settings are now locked. • OSD Unlock: Press and hold the [1] button again for 10 seconds.
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Main Menu Controls Adjust the menu items shown below by using the up and down buttons. Control Explanation Contrast adjusts the difference between the image background (black level) and the foreground (white level). Brightness adjusts the background black level of the screen image ZOOM expands and contracts the entire screen image Horizontal Position moves the screen image left or right. Horizontal Size adjusts width of the screen image. Vertical Position moves the screen image up or down.
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Control Explanation Degauss removes the build-up of magnetic fields that can cause irregular colors to appear around the edges of screen images. There are two ways to degauss the display: automatically by turning the monitor on, or manually by selecting the Degauss control from the menu. With Degauss selected from the menu, press button [2] to degauss the monitor manually. Important: Do not degauss repeatedly. Doing so can be harmful to the display.
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4. Circuit Description 4-1 Micro controller and deflection circuit MICRO Controller The micro controller(IC101) core is a 80C51 type. The micro clock frequency of 12 Mhz is derived from the Xtal oscillator,which is running at 48MHz. The DDC interface is suitable to handle DDC2 by a modified hardware I2C-bus interface .Standard high current ports,3 ADC pouts with voltage inputs and 4 static standard 8 bit DAC outputs (low interference) and one PWM output for digital control application are implemented.
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The x-ray ptotection (pin22) input XRAY provides a voltage detector with a precise voltage input for X-ray protection .If the input voltage at XRAY exceeds the upper threshold for 150us to 300us,the system is forced to shut down by switching off vertical,H-and B-drive signals. There are two different ways to handle the system in case of XRAY occurrence: 1. If the xray latch enable bit UCXRAY [2] was set to “0” during startup the system will shut down without any interference of the uC.
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4-2 Transistor & diode circuit Location BD901 Circuit function description Bridge Rectifier for AC Source D910 Clamp Diode for snub CKT D919 Rectifier for Output Voltage D922 Rectifier for Output Voltage D923 Rectifier for Output Voltage D930 Rectifier for Output Voltage D918 Rectifier for Output Voltage IC901 Power IC for Switching Power Control.
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5. Adjusting Procedure 5-1 Adjustment conditions and precautions 1. Approximately 30 minutes should be allowed for warm up before proceeding. 2. Adjustments should be undertaken only on those necessary elements since most of them have been carefully preset at the factory. 5-2 Main adjustments NO. FUNCTION LOCATION DESIGNATION 1. 14V ADJ PCB - MAIN VR903 2. B + ADJ PCB - MAIN VR902 3. SCREEN ADJ FLY BACK TRANS T402 SCREEN VR 4. FOCUS ADJ FLY BACK TRANS T402 FOCUS VR1&VR2 5. 6.
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CONTRAST V-LINEARITY BRIGHTNESS V-LINEARITY H-CENTER R-GAIN H-SIZE G-GAIN V-CENTER B-GAIN V-SIZE R-BIAS DEGAUSS G-BIAS PINCUSHION R-BIAS TRAPEZOID 9300 COLOR TEMPERATURE PIN-BALANCE 6500 COLOR TEMPERATURE PARALLELOGRAM 50 COLOR TEMPERATURE ROTATION HC/RASTER HT HG HS SUB H-SIZE V-MOIRE REDUCE V-HV Variation rate ajust MAX H-SIZE RANGE SUB H-SIZE Hs Hb H-SIZE WAVE BALANCE ViewSonic Corporation MAX V-SIZE GAIN RANGE H-MOIRE REDUCE BOTTOM CORNER HM VG H-SIZE GAIN TOP CORNE
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TOP BALANCE Tb EHT OFFSET EO MAX V-SIZE GAIN RANGE VG H-SIZE GAIN HG SB HIGH BRIGHTNESS SELECT RETURN AB EHT CURRENT EU EHT AUTO ADJUST EA Video IC dc off set DC H-frequency select SW Brightness Save LH V-CENTER OFFSET VO ABL ADJUSTMENT D. To switches the input signal to the other Timing Mode. Please follow step A ~ C to get the optimum picture. E. Select the " " RETURN function and press the MENU Key, then the Factor Preset window will be returned to the original OSD window.
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C. Then adjust focus VR1 to a fine vertical line. D. Adjust focus VR2 to a fine horizontal line. E. Repeat step C & D.then fix the Focus VR, G2 VR . 5. Purity Adjustment A. Be sure that the display is not being exposed to any external magnetic fields. B. Ensure that the spacing between the Purity, Convergence, Magnet, (PCM), assembly and the CRT stem is 29mm. (See below diagram) C. Produce a complete, red pattern on the display.
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6. Trouble Shooting Flow Chart 6-1. No raster,CRT relative circuit problems CHECK MAIN BOARD POWER SUPPLY: 12V, 180V, 83V, -12V, 6.3V NG PLEASE CHECK POWER SAVING CIRCUIT OR POWER SUPPLY CIRCUIT. OK PLEASE CHECK HIGH VOLTAGE OF CRT ABOUT 25.5~26.5KV NG ENTER POWER OR POWER CIRCUIT FAIL. NG CHECK THE CIRCUIT OF PIN 18/20 OF IC101 OK CHECK THE HEATER VOLTAGE AT CRT SOCKET ABOUT 6.3V NG CHECK THE 6.
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6-3. Abnormal video level on screen CHECK THE VOLTAGE AT PIN10/14/17/22 OF IC801 ABOUT 5V NG CHECK 5V SUPPLY CIRCUIT OK CHECK THE SIGNAL OUT ABOUT 0.7VP-P NG OK CHECK THE CLAMP PULSE OF IC801 PIN27 NG CHECK SIGNAL CABLE INTERFACE CARD OR CHECK THE RELATIVE CIRCUIT OF IC801 PIN27 OK CHECK THE VOLTAGE OF IC801 PIN23/24/25 ABOUT 4VP-P NG CHECK THE RELATIVE CIRCUIT OF IC801 PIN23/25/24 OR THE IC801 FAIL OK CHECK THE RELATIVE CIRCUIT OF IC802 6-4.
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6-5.
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6-7. Abnormal horizontal linearity CHECK L401, Q426, Q420, Q427 AND IC101 PIN9,10,11 6-8. Abnormal vertical size READJUST V-SIZE FUNCTION VALUE CHECK THE IC601 PIN1 ABOUT 11.8V PIN 4 ABOUT -12V NG CHECK D601, C605 RELATIVE CIRCUIT OK CHECK VERT. OSC CIRCUIT NG CHECK THE VOLTAGE OF IC101 RELATIVE CIRCUIT OK READJUST V-SIZE FUNCTION VALUE NG CHECK IC101 PIN33,34 RELATIVE CIRCUIT 6-9.
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6-12. Power supply trouble shooting chart Before check SW.REG.Please refer to the power supply block diagram power supply output: (A) Variable output: 60V (B) Constant output : 6.3V, 12V,83V，180.V，－12V BEAD SET ABNORMAL VARIABLE OUTPUT MAKE SURE THAT THE VARIABLE OUTPUT IS NOT SHORTED CHECK AC LINE VOLT 120V OR 220V NG CHECK F901, SW901 OK NO CHECK LINE RECTIFIED & SMOOTHED VOLT CHECK IC101 PIN39,40,41, B+ DRIVER YES CHECK THE 56V OUTPUT NG CHECK BRIDGE RECTIFIED OK NG CHECK START C.K.
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7. Recommended Spare Parts List RECOMMENDED SPARE PARTS LIST (G90fB-4M) ViewSonic Model Number: VS10794-3M Rev: 1a Serial No.
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RECOMMENDED SPARE PARTS LIST (G90fB-4E) ViewSonic Model Number: VS10794-3E Rev: 1a Serial No.
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RECOMMENDED SPARE PARTS LIST (G90fB-4P) ViewSonic Model Number: VS10794-3P Rev: 1a Serial No.
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BOM LIST (G90fB-4M/E/P) ViewSonic Model Number: VS10794-3M/E/P Rev: 1a Serial No. Prefix: PY9 / PYA / PYC Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 ViewSonic P/N Ref.
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Item 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 ViewSonic P/N Ref.
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Item 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 ViewSonic P/N #N/A #N/A #N/A #N/A #N/A #N/A #N/A E-RL-0414-0110 #N/A #N/A #N/A #N/A #N/A M-SW-0815-0208 M-SW-0815-0200 #N/A #N/A #N/A E-00004539 #N/A E-00004658 #N/A E-00004072 #N/A E-00004342 #N/A #N/A
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Item 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 ViewSonic P/N E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E
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Item 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 ViewSonic P/N E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E-00003625 E
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Item 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 ViewSonic P/N #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A E-00004322 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N
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Item 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 ViewSonic P/N #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A E-0
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Item 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 ViewSonic P/N Ref.
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Item 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 ViewSonic P/N Ref. P/N Description #N/A 67C 309220 4T 22UF +-20% 25V #N/A 67C 309229 7T 2.2UF +-20% 50V #N/A 67C 309479 7T 4.
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Item 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 ViewSonic P/N Ref. P/N Description E-00001202 65C 2M103 3B6921 0.
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Item 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 ViewSonic P/N #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A E-C-0404-4629 E-C-0404-4629 E-C-0404-4629 E-C-0404-4629 E-C-0404-4629 #N/A #N/A #N/
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Item 832 833 834 835 836 837 838 839 840 841 842 ViewSonic P/N #N/A #N/A E-00004070 #N/A #N/A #N/A E-R-0405-0377 #N/A M-00002753 #N/A E-00003625 Ref.
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8.
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EXPLODED PARTS LIST (G90fB-4M/E/P) ViewSonic Model Number: VS10794-3M/E/P Rev: 1a Serial No. Prefix: PY9 / PYA / PYC Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 ViewSonic P/N #N/A C-00004893 #N/A #N/A #N/A #N/A #N/A #N/A C-00004891 HW-00002749 #N/A #N/A E-00003861 #N/A ViewSonic Corporation Ref.
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9. Block Diagram Function key menu/exit/up /down control SIGNAL CABLE H IC101 R V G B SAA4849PS/V1016 CRYSTAL 48M IC601 STV8172A VERT.O/P IC802 LM2465 O/P IC405 UC3843 IC801 LM1246DKA PRE.AMP. On screen display IC803 LM2480 Q907, IC903 EHT Q402,T401 HOR. DRIVER Power saving Q426 Size control G1 control Q412 circuit R G B CRT FOCUS G2 HV G1 Q403,T402(FBT) HOR.
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IC101 NC 56 1 SwiChoice DSDA 3 ISDA DSCL 54 4 Mute G1 Vs 53 5 ROTA Hs 52 6 H-LIN EEP W/R 51 7 Unlock 8 CLAMP Pro 50 VsOUT 49 REM 48 9 CS1 10 CS2 NC 46 XTAL2 12 XTAL1 45 standby 13 OFF MODE 44 14 VSSE VDDA 43 15 VDDD Vssa 42 16 V5V BOP 18 BDRV 19 HBGND 20 21 22 SAA4849 47 11 NC 17 VSSD IC101 55 2 ISCL 23 24 25 26 27 28 Bin Bsens AGND HDRV Vref HFB XRAY Iref EWdrv RST VOUT2 Vfocus VUOT1 Deguss EHT ABLadj DouColor KEY2 Uvolt KEY1 SinColor 41 40 39
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SAA4849 ViewSonic Corporation 41 Confidential - Do Not Copy G90fB-4
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IC102 1 2 3 4 A0 VCC A1 WP A2 ISCL A4 ISDA 8 7 6 5 M24C08-BN6 Vs Vb 6 2 IC601 TDA8172 FB +I/P +O/P 3 5 4 7 -I/P -12V 1 ViewSonic Corporation 42 Confidential - Do Not Copy G90fB-4
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IC801 LM1246DKA 1 2 3 4 5 6 7 8 9 10 11 12 ViewSonic Corporation V FLY H FLY CAPA CLAMP VDD1 ABL GND1 R R G G B B VDD GNDPLL GND VCO 1OUT VCC 2OUT SDA 3OUT SCL CAP D 43 24 23 22 21 20 19 18 17 16 15 14 13 Confidential - Do Not Copy G90fB-4
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4 8 6 I/P I/P Vcc Vbb 9 56C551-521 IC802 R O/P G O/P 1 3 I/P B O/P 2 5 7 GND LM2465 ViewSonic Corporation 44 Confidential - Do Not Copy G90fB-4
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56C539-6 LM2480NA IC803 1 Ri Ro IC901 TEA1507P 8 8 7 2 Gi Go 7 6 3 Bi Bo 6 5 4 GNDVCC ViewSonic Corporation DRAIN VCC NC GND DRIVER SENSE CTRL DEMAG 1 2 3 4 5 45 Confidential - Do Not Copy G90fB-4
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10．Schematic Diagrams 1 + 5.015V 2 C107 100 3.212V 3 C110 100 2.658V 4 C913 1000P 5 7 6 GND 0.673V 100 7 IC102 Vs A0 VCC 8 2 3 4 A1 WP A2 ISCL A4 ISDA CLAMP 0.314V 100 R108 2K2 2K2 +80V 9 CS1 4.996V 7 R117 100 R105 100 R143 100 R103 100 10 CS2 0.010V 6 11 CS3 4.996V 12 CS4 4.996V OFF R149 CS1 4.7K 13 OFF 4.963V CS2 14 VSSE 0.005V C129 15 100P 100P C103 0.
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10-2. POWER 715C1480-*-VSC 0.01uF 2KV + 330P 2KV C930 47UF/160V L902 + 11 + L904 100UH R903 NC C908 Q903 IC904 TL431ACZ-AP I I O R908 2K7 1/2W R909 240 1/2W C938 NC C941 C906 + NC 10UF/16V 1n/500V SBYV26C IC903 NC R907 47 + G K C928 47P/1KV R951 1K A R953 5K6 1/2W I O O +5V G I ZD901 TZX8V2A +5V O + 5.1V D938 IC905 56C133-5-ST D936 1N4148 Q935 BT169B C482 4700UF 16V G 1 2 J018 22n 100V R902 NC G 0.
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10-3. OUTPUT 6.1V P403 1 Rotation 3 + Q729 6 C439 820n 100V t C720 680P/1KV 6 R400 1mH 39 1W + 0.39uF 250V R404 75K 1/2W C426 0.18uF 400V C402 1UF 250V BC547B Q712 NC ZD712 JUMPER 48 Confidential - Do Not Copy 68K 1/4W R477 1u 100V C436 220K 1/8W C715 0.
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10-4. VIDEO FB802 R816 8K2 715C1504-* R807 4K7 R818 5 6 9 C806 0.1u 7 C803 22P HS R810 1K8 VS DDC-SDA 11 DDC-SCL 12 S-TEST R_OUT R IN G_OUT G_IN Vcc 8 C815 1500P ZD804 NC 0.033uF 5.6K L805 5V FB807 BEAD BEAD ZD803 R809 1K8 + GND 5V 18 C822 0.1UF 17 9 ZD805 5.1V 6 9 C818 0.1uF 11 12 NC PLL FILLTER DEC 1 OUT PLL Vcc SDA DEC 2 OUT DEC 3 OUT SCL CAP_D 16 C809 10uF 50V NC + IC802 I/P 11K R833 C836 0.1UF 13 11K R834 1 R O/P 1 C837 0.
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11. PCB Layout Diagrams 11-1.
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11-2.
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* Reader’s Response* Dear Readers: Thank you in advance for your feedback on our Service Manual, which allows continuous improvement of our products. We would appreciate your completion of the Assessment Matrix below, for return to ViewSonic Corporation. Assessment A. What do you think about the content of this Service Manual? Unit Excellent Good Fair Bad Excellent Good Fair Bad 1. Precautions and Safety Notices 2. Specification 3. Front Panel Function Control Description 4. Circuit Description 5.