Service Manual ViewSonic VA1903wb/VA1903wm Model No VS11618 19” Color TFT LCD Display Manufacture Date: Dec-25-06 -1– ViewSonic Corporation Confidential - Do Not Cop VA1903wb/VA1903wm
Copyright Information ® Copyright © ViewSonic Corporation, 2006. All rights reserved. Macintosh and Power Macintosh are registered trademarks of Apple Computer, Inc. Microsoft, Windows, Windows NT, and the Windows logo are registered trademarks of Microsoft Corporation in the United States and other countries. ViewSonic, the three birds logo, OnView, ViewMatch, and ViewMeter are registered trademarks of ViewSonic Corporation. VESA is a registered trademark of the Video Electronics Standards Association.
TABLE OF CONTENTS 1. Precautions And Safety Notices 4 2. Specification 7 3. Front Panel Control And Indicators 9 4. Circuit Description 15 5. Adjustment Procedure 25 6. Troubleshooting Flow Chart 44 7. Recommended Spare Parts List 45 8. Exploded Diagram And Spare Parts List 60 9. Disassemble Process 64 10. Block Diagram 69 11. Schematic Diagram 70 12.
1. Precautions And Safety Notices 1.1 SAFETY PRECAUTIONS This monitor is manufactured and tested on a ground principle that a user’s safety comes first. However, improper use or installation may cause damage to the monitor as well as the user. Carefully go over the following WARNINGS before installing and keep this guide handy. WARNINGS ．This monitor should be operated only at the correct power sources indicated on the label on the rear end of the monitor.
1.4 HANDING AND PLACING METHODS Correct Methods: Incorrect Methods: Only touch the metal frame of the LCD Surface of the LCD panel is pressed by fingers panel or the front cover of the monitor. Do and that may cause “Mura.” not touch the surface of the polarizer. Take out the monitor with cushions Taking out the monitor by grasping the LCD panel. That may cause “Mura.
Placing the monitor on foreign objects. That Place the monitor on a clean and soft foam could scratch the surface of the panel or cause pad. “Mura.” Place the monitor on the lap, the panel The panel is placed facedown on the lap. That surface must be upwards. may cause “Mura.
2. Specification 2.1 PRODUCT SPECIFICATIONS LCD Type 19.0” (full 19” wide viewable diagonal area), TFT(Thin Film Transistor),Active Matrix WXGA+ LCD Color Filter RGB vertical stripe Glass Surface Anti-Glate Input Signal Video Sync RGB analog(0.7/1.
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Do the following to adjust the display setting: 1. To display the Main Menu, press button [1]. NOTE: All OSD menus and adjustment screens disappear automatically after about 15 seconds. This is adjustable through the OSD timeout setting in the setup menu. 2. To select a control to adjust, press ▲or ▼ to scroll up or down in the Main Menu. 3. After the desired control is selected, press button [2]. A control screen like the one shown below appears.
Main Menu Controls Adjust the menu items shown below by using the up Control and down buttons. Explanation Auto Image Adjust automatically sizes, centers, and fine tunes the video signal to eliminate waviness and distortion. Press the [ 2 ] button to obtain a sharper image. NOTE: Auto Image Adjust works with most common video cards. If this function does not work on your LCD display, then lower the video refresh rate to 60 Hz and set the resolution to its pre-set value.
1. To select color (R, G or B) press button [2]. 2. To adjust selected color, press ▼ and ▲. Important: If you select RECALL from the Main Menu when the product is set to a Preset Timing Mode, colors return to the 6500K factory preset. Information displays the timing mode (video signal input) coming from the graphics card in the computer, the LCD model number, the serial number, and ® the ViewSonic website URL.
NOTE: Try Auto Image Adjust first. Sharpness adjusts the clarity and focus of the screen image. Setup Menu displays the menu shown below: Language Select allows the user to choose the language used in the menus and control screens. Resolution Notice displays the Resolution Notice menu shown below. Resolution Notice advises the optimal resolution to use. OSD Position allows the user to move the OSD menus and control screens. OSD Timeout sets the length of time the OSD screen is displayed.
SHORT CUTS FUNCTION FROM THE BUTTONS [1] Main Menu [2] Input toggle（Analog or Digital；refer to Appendix D） [▼] Contrast adjust [▲] Contrast adjust [▼] + [▲] [1] + [2] [1] + [▼] + [▲] recall both of Contrast and Brightness to default toggle 720x400 and 640x400 mode when input 720x400 or 640x400 mode White Balance (Not shown on user’s guide) [1] + [▼] Power Lock [1] + [▲] OSD Lock No signal + [2] + [ ] Burning mode Signal + [2] + [ ] Factory mode Remark : All the short cuts function are only
4. Circuit Description 4.1 LCD MONITOR DESCRIPTION The LCD MONITOR will contain a Main Board, an Power Board, Key Board which house the flat panel control logic, brightness control logic and DDC. Monitor Block Diagram Flat Panel and CCFL backlight CCFL Drive. RS232 Connector For white balance adjustment in factory mode Main Board Power Board (Include: adapter, inverter) Video signal, DDC Key Board AC-IN 100V-240V 4.
4.3 PWPC BOARD BLOCK FUNCTION DESCRIPTION PWPC board combines to adapter and inverter, Adapter which commonly consists of bridge rectifier and filter, start circuit, PWM control circuit, protection circuits and convert to 12V, 5V DC voltage by input 90V-240V AC voltage that provide power supply for each chips in the main board and inverter. Inverter is DC TO AC circuit. It changes the 12v DC of power supply to about 600-800v AC that drives the backlight.
4.4 INTRODUCTION OF IC TSUM16AL-1(U401): integrate ADC, OSD, SCALER, MCU, LVDS, convert analog RGB into digital and room and shrink scaling output to LCD panel.
PIN Function: Pin 37 38 39 40 30 Symbol SDO CSZ SCK SDI DDCA_SDA/RS232_TX Description SPI flash serial data output SPI flash chip select SPI flash serial select SPI flash serial data input DDC data for analog interface; 4mA driving strength/UART transmitter/GPIO 31 DDCA_SDA/RS232_RX DDC data for analog interface/UART transmitter/GPIO 84 RST Chip reset; High reset 87 RSTN Chip reset; Low reset 81 VCTRL Regulator control 27 HSYNCO Analog HSYNC input 28 VSYNCO Analog VSYNC input 26 REFP Internal ADC top de-c
and program operations. The devices can be programmed in standard EPROM programmers as well. Pin Diagram: PIN Descriptions: Symbol CE# Type INPUT SO WP# OUTPUT INPUT GND Vcc HOLD# INPUT SCK SI INPUT INPUT Description Chip Enable: CE# goes low activates the device’s internal circuitries for device operation. CE# goes high deselects the device and switches into standby mode to reduce the power consumption.
TDA7496L(U201): The TDA7496L is a stereo 2W+2W class AB power amplifier, specially designed for high quality sound, TV and Monitor applications. Features of the UTC TDA7496L include linear volume control, Stand-by and mute functions.
PIN Function LD7575 PS (IC901): The LD7575 is a current-mode PWM controller with excellent power-saving operation. The embedded over voltage protection, over load protection and the special green-mode control provide the solution for users to design a high performance power circuit easily and etc.
PIN Descriptions: Pin 1 2 3 4 5 6 7 8 Name Function This pin is to program the switching frequency. By connection a resistor to ground to set the switching frequency. Voltage feedback pin(same as the COMP pin in UC384X), By COMP connecting a photo-coupler to close the control loop and achieve the regulation.
PIN Descriptions: Pin Names Description 1 DRV1 Drive output 2 VDDA Supply voltage input 3 TIMER 4 DIM 5 ISEN Timing capacitor to set striking time and shutdown delay time Analog dimming or Internal LPWM dimming or external PWM pulse input for dimming function Current sense feedback 6 VSEN Voltage sense feedback 7 OVPT Over-voltage/ over-current protection threshold setting pin 8 NC No connection 9 NC No connection 10 ENA 11 LCT 12 SSECMP 13 CT 14 GNDA Ground for analog s
Block Diagram - 24 – ViewSonic Corporation Confidential - Do Not Cop VA1903wb/VA1903wm
5. Adjustment 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. 3. ESD protection is needed before adjustment. 5.2 MAIN ADJUSTMENTS NO. 1. 2. 5.
3.)Into factory mode of VA1903wb/VA1903wm A、First Power off, then press Switch 2 button along with press Power button will activate the factory mode, then MCU will do AUTO LEVEL automatically. Meanwhile press MENU the OSD screen will located at LEFT TOP OF PANEL. 4.)Bias adjustment : Set the Contrast to 70 Adjust the Brightness to 100. 5.
C、Adjust 5400 color-temperature (1) Switch the chroma-7120 to RGB-Mode (with press “MODE” button ) (2)、Switch the MEM .channel to Channel 11( with up or down arrow on chroma 7120 ) (3)、The LCD-indicator on chroma 7120 will show x = 0.335 ±0.03, y = 0.350 ±0.
5.4 Factory Defaults Item Contrast Brightness Color Temperature Defaults 70% 100% 6500K Item Input Priority Resolution Notice Volume Sharpness OSD H. Position OSD V. Position OSD Time Out OSD Background 100% 50% 50% 15 On Balance Treble Bass 720x400 / 640x400 Defaults N/A On 50% (for VA1903wm only) N/A N/A N/A 720x400 5.
Function Test Display Pattern Item 1 2 Test Content Pattern Frequency & Fine Line Moire Tracking Contrast/Bright 16 Gray Scale ness Horizontal&Vertical Thickness 3 Boundary 4 RGB Color RGB Color Intensities Performance 5 Screen Uniformity Flicker 6 Dead Pixel/Line White Screen & Dark Screen 7 White Balance White & Black Pattern Remark Figure 1 Figure 2 Figure 3 Figure 4,5,6 Should be compliant Figure 7 with the spec.
Horizontal & Vertical Thickness Pattern (Figure 3) G. Color Pattern (Figure 5) Full White Pattern (Figure 7) R. Color Pattern (Figure 4) B.
Black-White Pattern (Figure 9) 4.3 Function Test and Alignment Procedure All Modes Reset You should do “All Mode Reset” (Refer to Chapter III-3. Hot Keys for Function Controls) first. This action will allow you to erase all end-user’s settings and restore the factory defaults. Auto Image Adjust Please select and enter “Auto Image Adjust” function on Main Menu to see if it is workable. The “Auto Image Adjust” function is aimed to offer a better screen quality by built-in ASIC.
White Balance Test Signal: 1440*900@60Hz Test Pattern: White and Black Pattern 1.5.8 R, G, B, Colors Contrast Test Signal: 1440*900@60Hz Test Pattern: R, G, B, Color Intensities Pattern and 16 Gray Scale Pattern - Check and see if each color is normal and distinguishable. - If not, please return the unit to repair area. Screen Uniformity and Flicker Test Signal: 1440*900@60Hz Test Pattern: Full White Pattern - Check and see if it is in normal condition. 1.5.
the latest. If not, please do the following procedures to upgrade it to the latest version. 1 Equipment Needed - VA1703W/VA1903W Monitor - Fixture for Firmware Upgrade - Power Adapter (P/N: 47.58201.001) *1 for Fixture - VGA Cable (P/N: 42.59901.003) *1(Pin 4, 11 should be connected to GND) - PC (Personal Computer) - LPT Cable (P/N: 42.59906.001) *1 - Firmware Upgrade Program - One additional monitor for checking the program execution VA1703W/VA1903W 2 Setup Procedure 2.
JP1：to Power Adapter P1：to VGA Cable P3：to Signal Generator P2：to LPT Cable 3 Firmware Upgrade Procedure Step 1. Let VA1703W/VA1903W set to be connected with AC cable and VGA cable. Step 2.Execute the MSstar ISP tool. Step 3. Click “Connect” button . (On this step, if the connection is successful, the “Device Type is ******(Flash Type)” Dialog will be showed. If not, the error dialog will be done.
Step 4. Click “Read” button. Select the object bincode on your corresponding directory. Step 5. Click “Auto” button. Be sure that function of Erase Device (File Area), Blank, Program and Verify is selected, then execute the flashing action by clicking the “Run” button.
Step 6. If the flashing F/W has been completed, “Verify Ok” message will be shown on the right TextBox. Step 7. Unplug and replug power cord of VA1703W/VA1903W set and then check the OSD operation and image on srceen. Step 8. At last, do “Memory Recall.
3.2 Setup Procedure 3.2.1 Connect P2 and monitor of Fixture with VGA ports of VA1703W/VA1903W by VGA Cable. 3.2.2 Connect P1 of Fixture with Printer port of PC by LPT Cable. 3.2.3 Plug Power Adapter to Fixture. 3.2.4 Connect Power Cord to VA1703W/VA1903W Monitor. 3.2.5 Connect PC to the additional monitor. JP1： Power Adapter P2： VGA Cable P1：to LTP Cable 3.3 DDC Key In Procedure Sep1.
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Sep2:Inpute the S/N and execute “Enter” - 39 – ViewSonic Corporation Confidential - Do Not Cop VA1903wb/VA1903wm
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Sep3:Key the “Enter” and write the data - 41 – ViewSonic Corporation Confidential - Do Not Cop VA1903wb/VA1903wm
Sep4:If ddc program OK and show “data compare ok” - 42 – ViewSonic Corporation Confidential - Do Not Cop VA1903wb/VA1903wm
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7. Recommended Spare Part List VA1903m BOM list——T96HM9DB1WVSAJ 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 ViewSonic P/N Ref.
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 72 73 74 75 76 77 750GLH90GW132N000V A34G0028 KR L A34G0245AKD L A34G0246 KR 1L A34G0247 KR L A34G0248 KR L J12G 394800 J12G 808 1 J15G0188 2 J37G0090 1 J40G190T709 6A J40GSTAR709 1A J41G780170916A J41G7802709 2A J41G7802709 3A J44G9012 1 J44G9012 2 J44G9012709 2B J45G 76 28V3A J45G 88606 R J45G 88609800 R J45G 88626 1 R J50G 600 5 J50G 600 6 J52G 1185VSC J70G1902709 2A SMTAUPC6AA2 33G802410C H 56G 616 31
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 61G0603183 61G0603203 61G0603203 61G0603204 61G0603224 65G0603101 31 65G0603101 31 65G0603104 32 65G0603104 32 65G0603474 27 65G0603474 27 67G 305100 4T 67G 305109 7T 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 715G2472 1 SMTC6HM9VSA1 33G3802 9 33G801710A H 33G8027 12 33G802724B H 40G 45762412B 67G215L101 4N 67G215V100 7R 67G215V100 7R 67G305V10
118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 56G1133 32 56G1133 84 56G1133713 57G 417 12 57G 417 12 57G 417 12 57G 417 12 57G 417 13 57G 417 13 57G 417 13 57G 417 13 57G 758 1 57G 758 1 57G 763 1 61G0402000 61G0402000 61G0402100 61G0402100 61G0402101 61G0402101 61G0402101 61G0402101 61G0402101 61G0402101 61G0402101 61G0402101 61G0402101 61G0402101 61G0402101 61G0402102 61G0402102 61G0402102 61
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 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402103 61G0402200 61G0402200 61G0402203 61G0402222 61G0402222 61G0402223 61G0402241 61G0402390 0F 61G0402470 61G0402470 61G0402470 61G0402
198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 61G0402472 61G0402472 61G0402472 61G0402472 61G0402513 61G0402562 61G0402562 61G0402562 61G0402750 61G0402750 61G0402750 61G0402750 61G0603000 61G0603000 61G0603000 61G0603103 61G1206000 61G1206151 61G1206151 65G0402104 65G0402104 65G0402104 65G0402104 65G0402104 65G0402104 65G0402104 65G0402104 65G0402104 65G0402104 65G0402104 65G0402104 65G0402104
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 65G0402221 32 65G0402224 17 65G0402224 17 65G0402224 17 65G0402330 31 65G0402330 31 65G0402473 12 65G0402473 12 65G0402473 12 65G0402473 12 65G0402473 12 65G0402473 12 65G0402473 12 65G0402473 12 65G0402473 12 65G0402473 12 65G0402473 12 65G0402473 12 65G0402473 12 65G0402473 12 71G 56Z601 M 71G 56Z601 M 71G 56Z601 M 71G 56Z601 M 71G 56Z601 M 93G 64
278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 33G3802 2H 33G3802 2H 33G8027 12 H 77G 600 1GCJ 77G 600 1GCJ 77G 600 1GCJ 77G 600 1GCJ 77G 600 1GCJ 81G 12 1F GH 95G 900 57 AIKEPC6AAF 61G0603102 61G0603392 61G0603392 61G0603392 95G 90 23 95G 90 23 95G 90 23 95G 90 23 715G2473 1 PW942HV1SMTJ S73G17465VW S73G25391V S73G25391V S80GL19T8V1 S80GL19T8V1 9G6005 1 33G8021 2E U 33G8021 2E U 33G8021 2E U 33
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 65G 3J5096ET 65G 3J5096ET 65G 3J5096ET 65G 3J5096ET 65G305M1022BP 65G305M1022BP 65G306M2222BP 67G 31510115K 67G215D4714KV 67G215D4714KV 67G215D4714KV 67G215D4714KV 67G215D4714KV 67G215D4714KV 67G215D4714KV 67G215D4714KV 73L 174 53 LG GP 80GL17T 37 L GP 87G 501 36 S 93G 50460900 95G 90 23 95G8014 12707 JT 705G 980 61S01 705G 980 61S02 705GQ7K0 57001
358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 61G0805000 61G0805000 61G0805000 61G0805000 61G0805000 61G0805100 61G0805100 61G0805100 61G0805102 61G0805102 61G0805102 61G0805102 61G0805102 61G0805102 61G0805103 61G0805103 61G0805103 61G0805103 61G0805103 61G0805104 61G0805104 61G0805105 61G0805105 61G0805105 61G0805105 61G0805105 61G0805105 61G0805184 61G0805240 61G0805304 61G0805330 61G0805330
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 61G0805510 0F 61G0805751 61G0805751 61G0805754 61G0805823 61G0805823 61G1206000 61G1206000 61G1206000 61G1206000 61G1206000 61G1206000 61G1206000 4 61G1206000 4 61G1206101 61G1206101 61G1206101 61G1206102 61G1206103 61G1206220 61G1206220 61G1206300 61G1206300 61G1206300 61G1206300 61G1206300 61G1206300 61G1206300 61G1206300 61G1206392 61G1206392 61G
438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 61G1206519 61G1206684 61G1206684 61G1206684 65G0805102 31 65G0805103 32 65G0805104 32 65G0805104 32 65G0805104 32 65G0805104 32 65G0805104 32 65G0805104 32 65G0805104 32 65G0805104 32 65G0805104 32 65G0805104 32 65G0805104 32 65G0805104 32 65G0805105 22 65G0805105 22 65G0805105 22 65G0805221 31 65G0805224 22 65G0805332 32 65G0805332 32 65G0805471 31
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 93G 64 33 93G 64 33 93G 6432S 93G 6432S 93G 6432S 93G 6432S 93G 6432S 93G 6432S 93G 39S 24 T 93G 39S 24 T 93G 39S 38 T 93G 39S 40 T 93G 39S 44 T 6G 31500 6G 31502 6G 31502 6G 31502 6G 31502 6G 31502 6G 31502 6G 31502 6G 31502 56G 158 4 T 61G212Y305 KT 61G212Y305 KT 65G 1K102 5T 65G 2K152 1T 65G 2K152 1T 65G 2K152 1T 67G215Y2207KT 71G 55 29 84G 55 7W
518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 95G 90 23 715G1899 2 VS 61G152M10458F 96G 29 6 GP 61G152M47858F 96G 29 6 GP 57G 667 21 AM1G1730 8120 Q90G0035 1 93G 60252 AM1G1730 8120 Q90G0009 1 90G6241 2 GP 93G 60248 AM1G1730 8120 TINCOATEDCOPPER TINCOATEDCOPPER TINCOATEDC
9 10 11 12 13 14 15 16 17 18 J12G 808 2 J15G0188 1 J40G190T709 5A J41G780170917A J41G7802709 1A J44G9012709 1B J70G1902709 1A SMTC6HM9VSA2 SMTKEPC6AAG AIKEPC6AAG VESA RUBBER MAIN FRAME HYDIS ID VA1903wb-T SELL CARD QSG CARTON CD MANUAL MAIN BOARD FOR SMT KEPC BOARD KEPC BOARD FOR AI 4 1 1 1 1 1 1 1 1 1 - 59 – ViewSonic Corporation Confidential - Do Not Cop VA1903wb/VA1903wm
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VA1903wb EPL Part List ITEM DESCRIPTION PART NUMBER 1 BEZEL 2 PAENL HSD190MGW1-A02 HSD 3 FUNC.
Packing For Shipping - 62 – ViewSonic Corporation Confidential - Do Not Cop VA1903wb/VA1903wm
Packing Part List ITEM DESCRIPTION PART NUMBER Q'TY 1 CARTON J44G9012709 1A 1 2 HANDLE1/2 J50G 600 5/6 1 3 PE BAG 45G 76 28 V3A 1 4 CD MANUAL J70G1902709 1A 1 5 QSG J41G7802709 1A 1 J45G 88606 R 1 T96HM9DD1WVSNJ 1 6 EPE COVER 7 MONITOR 8 PE BAG 9 EPS 10 POWER CORD 11 SIGNAL 12 J45G 88626 1 J44G9012 CABLE BASE R 1 1/2 1 89G414A18N LS 1 89G 728HAA902 1 A34G0028E4Z L 1 - 63 – ViewSonic Corporation Confidential - Do Not Cop VA1903wb/VA1903wm
9. Disassemble Process 9.1 Units Disassemble Process 9.1.1 Tools Glove Big cross screwdriver Small cross screwdriver Prize equipment or abandoned IC card Screw box Cushion Six angle sleeve spanner 9.1.2 Disassemble process 1、 Tide up the worktable, spread straight cushion, put the monitor on it, the front side adown.(Picture 1) 2、 Remove the decorate slice of the back cover.(Picture 2, 3) 3、 Disassemble the 4 screws that fix the stand, remove the stand.
9.1.
（Picture 7） （Picture 8） （Picture 9） （Picture 10） （Picture 11） （Picture 12） - 66 – ViewSonic Corporation Confidential - Do Not Cop VA1903wb/VA1903wm
（Picture 13） （Picture 14） （Picture 15） （Picture 16） （Picture 17） （Picture 18） （Picture 19） - 67 – ViewSonic Corporation Confidential - Do Not Cop VA1903wb/VA1903wm
（Picture 20） - 68 – ViewSonic Corporation Confidential - Do Not Cop VA1903wb/VA1903wm
10.
11. Schematic Diagram 11.1 Top TSUM16AL-1 XGA/SXGA/WSXGA B3 SCHEMATIC LVDS OUTPUT B4 RIN GNDR GIN GNDG SOG BIN GNDB HSY NC VSY NC DDCA_SDA DDCA_SCL DET_VGA +5V +5V RIN GNDR GIN GNDG SOG BIN GNDB HSY NC VSY NC DDCA_SDA DDCA_SCL DET_VGA VCC1.8 VCC3.3 +5V +12V VCC1.8 VCC3.3 +5V +12V DDC_WP DDC_WP 3.INPUT +12V B2 B5 VLCD VCC1.8 on_BACKLIGHT on_Panel +5V VCC3.3 on_BACKLIGHT on_Panel PA[0..9] +12V Adj_BL2 PA[0..9] PA[0..9] VLCD Adj_BL2 VCC1.8 +5V Adj_BACKLIGHT VCC3.
11.2 Power +5V +12V R701 4 1 2 3 4 5 6 7 8 9 R702 4K7 1/16W BL_ADJ P W M D C 1K 1/16W R31 47 4K7 C32 N.C 1uF R703 C703 1 F 6.3V Adj_BACKLIGHT 4 Q701 PMBS3904 + 3 +5V R716 SMAL140 NC/1K 1/16W R717 NC/4K7 1/16W 100uF/25V New Power port define VI R706 R715 Adj_BL2 Q705 NC/PMBS3904 +5V 2 VCC3.3 + AP1117E33LA SOT223-3L ATC 4 SOT-223 NC/1K 1/16W The Current of VCC3.3 ( without support 1.8V) is arround 196.6mA. U702 is safe to use 1117 SOR223. VCC1.
R410 D402 BAV99 D403 BAV99 C410 0.047uF R405 100R 1/16W C405 0.047uF R407 100R 1/16W C407 0.047uF R409 100R 1/16W C409 0.047uF 120 OHM R416 1K 1/16W 20K 1/16W 4 GNDG 4 GNDB 4 +5V PC5V D412 DET_VGA 4 HSY NC 4 VSY NC 4 BAV70 R415 C412 ZD401 33pF 2K2 1/16W 220pF UDZS5.6B ZD405 UDZS5.6B ZD406 UDZS5.6B 47R 1/16W 47R 1/16W 0.
Scaler R507 R508 10R 1/16W 10R 1/16W The Current of AVDD is arround 68.1 mA.(Analog) 15 390 26 VCC3.3 0.1uF/16V 25 LVA3P LVA3M LVACKP LVACKM LVA2P LVA2M LVA1P LVA1M LVA0P LVA0M NC NC NC REFP REFM GPIO_P23 GPIO_P22 GPIO_P15/PWM0 PWM2/GPIO_P24 GPIO_P27/PWM1 GPIO_P12 PWM1/GPIO_P25 U402 R443 8 7 3 4 C425 NC 0.
11.5 Panel Interface CN703 4 PA[0..9] LVB0M LVB1M LVB2M LVBCKM LVB3M LVA0M LVA1M LVA2M LVACKM LVA3M PA[0..9] PA0 PA1 PA2 PA3 PA4 PA5 PA6 PA7 PA8 PA9 LVA3P LVA3M LVACKP LVACKM LVA2P LVA2M LVA1P LVA1M LVA0P LVA0M RXO0RXO1RXO2RXOCRXO3RXE0RXE1RXE2RXECRXE3- 1 3 5 7 9 11 13 15 17 19 21 23 2 4 6 8 10 12 14 16 18 20 22 24 LVB0P LVB1P LVB2P LVBCKP LVB3P LVA0P LVA1P LVA2P LVACKP LVA3P RXO0+ RXO1+ RXO2+ RXOC+ RXO3+ RXE0+ RXE1+ RXE2+ RXEC+ RXE3+ CONN VLCD 4 PB[0..9] PB[0..
11.6 Inverter ! PT801 POWER X'FMR 5 7 C816 22pF/3KV 3 4 +12V R805 470R 1/4W C811 470UF/25V C824 5pF/3KV 5 R822 3MΩ 1/2W 3 BAV99 D801 C820 1 G IC801 R823 82K 1/8W R827 3.6KΩ 1/8W 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 DRV1 PGND VDDA DRV2 TIMER GNDA DIM CT ISEN SSTCMP VSEN LCT OVPT ENA NC1 NC2 R813 1M 1/8W R826 510Ω 1% 1/8W C819 0.047uF R817 33K 1/8W R825 0Ω 1/8W R816 1MΩ 1% 1/8W C809 0.047uF C807 0.01uF 1uF/25V C808 180K 1/8W R860 1M 1/8W C838 0.
A-D Power R906 3 4 D903 0R05 1/4W C901 1000PF/250VAC VAR901 2 C908 0.1uF + ZD905 NC 1 3 L901 + 7 8 4 2 R909 5.1Ω 1/4W L + C907 NC POWER X'FMR C933 0.0015uF/2KV FB901 BEAD R914 0.47 OHM +-5% 2w ZD901 RLZ13B 4 IC902 TCET1103G R920 1K 1/8W ON/OFF DIM NC GND GND GND GND GND +5V +5V +12V +12V ZD902 RLZ5.6B C916 0.1uF R927 10KΩ 1/4W R925 3K6 1/8W C917 0.
11.8 Audio CN203 OUT_L 4 3 2 1 +12V CN202 6 11 12 20K R211 1/10W 100pF R210 GND 20K C211 1/10W GND C212 C209 C210 + + 100pF 1uF/50V 10uF/25V C213 0.1uF OUTR SVR VOLUME STBY VAROUT_R MUTE VAROUT_L GND OUT_R 15 VS 16 INR GND Title Size A Date: + 0.47uF/25V9 C205 470uF/16V + C206 1/10W 0.1uF C207 470uF/16V 17 14 10 7 5 R202 C208 + 470uF/25V R207 1/10W 220K OUTL 1K R212 INL 1/10W 1/10W 0.
11.9 Key Pad KEY _MENU KEY _AUTO POWER_KEY KEY _DOWN_LEFT KEY _UP_RIGHT 5 4 3 5 SW 2 1 4 3 5 SW 2 4 5 2 1 LED001 LED ZD002 NC/EGA10603V05A1-B 3 2 1 4 SW NC/0.1uF/16V C002 5 1 3 3 2 1 4 SW 2 1 LED_ORANGE LED_GREEN SW005 2 3 2 SW004 ZD001 NC/EGA10603V05A1-B SW SW003 1 1 SW002 NC/0.
12. PCB Layout Diagram 12.
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12.5 KEY BOARD TOP VIEW 12.
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* Reader’s Response* Dear Readers: Thank you in advance for you 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 after reading VA1903wb/VA1903wm Service Manual? Unit 1. Precautions And Safety Notice 2. Specification 3. Front Panel Control and Indicators 4. Circuit Description 5. Adjustment Procedure 6.
