Service Manual ViewSonic VP201b/s-1 Model No. VLCDS26064-2W/-4W 20" Color TFT LCD Display (VP201b/s-1_SM_685 Rev. 1d May.
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.
TABLE OF CONTENTS 1. Precautions and Safety Notices 1 2. Specification 3 3. Front Panel Function Control Description 12 4. Circuit Description 18 5. Adjustment Procedure 19 6. Troubleshooting Flow Chart 37 7. Recommended Spare Parts List 40 8. Exploded Diagram and Spare Parts List 58 9. Block Diagram 60 10. Schematic Diagrams 61 11.
1. Precautions and Safety Notices 1. Appropriate Operation (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) Turn off the product before cleaning. Use only a dry soft cloth when cleaning the LCD panel surface. Use a soft cloth soaked with mild detergent to clean the display housing. Use only a high quality, safety approved AC/DC power cord. Disconnect the power plug from the AC outlet if the product will not be used for a long period of time.
(11) After installation of the TFT Module into an enclosure (LCD monitor housing, for example), do not twist or bend the TFT Module even momentarily. When designing the enclosure, it should be taken into consideration that no bending/twisting forces may be applied to the TFT Module from outside. Otherwise the TFT Module may be damaged. (12) The cold cathode fluorescent lamp in the LCD contains a small amount of mercury. Please follow local ordinances or regulations for disposal.
2. Specification A. General specification: 1. General specification: LCD panel suppliers: LCD panel specification: Input signals: Input connector: Output connector: Display data channel: Signal frequency range: AUO: M201UN02 V.3 a. Panel size: b. Driver element: c. Effective display area: d. Pixel pitch: e. Max. resolution: f. Display color: 20.1-inch (viewable). a - Si TFT active matrix. 408.0 (H) X 306.0 (V) mm. 0.255 (H) X 0.255 (V) mm. UXGA (1600X1280 pixel). 16.7M colors (R, G, B 8-bit data).
2. Physical specification: Overall dimension: Weight: Mechanical adjustment: Packaging: a. Height: b. Width: c. Depth: a. Net weight: b. Gross weight: a. Tilt: b. Swivel: c. Height adjust: d. Pivot: a. Carton dimension: 480.55mm. 448.00mm. 266.65mm. 8.5kg. 11.2kg. +25 o ~ -5 o . ± 45 o . 110mm. 90 o . a. Height: 494mm. b. Width: 345mm. c. Depth: 560mm. Accessories: Power cable 1.8m. User guide (English). CD ROM. Warranty card. HD15 - HD15 cable. DVI (D) – DVI (D) cable. 3.
B. OSD Menu Functions 1. Interface board function test. 1.1 Function keys: Power, 1, ▲, ▼, 2. 1.2 Basic function check. 1.2.1 Input 1600x1200 / 60Hz, cross-hatch reverse pattern. 1.2.2 Push “1” & “2” key, select Auto image adjust, Contrast, Brightness, Input select, Color, Manual image adjust, Setup menu, Memory recall function. 1.2.
C. Image Calibration 1. Video alignment. Initial Settings 1.1 Set contrast to 70% and brightness to 100%. 1.2 Input a 640x480 / 60Hz, 5-block (5-MOSAIC) pattern (input level 100IRE 0.7Vp-p), then activate the White Balance function.
D. Image test 1. Picture size & position. 1.1 Picture size. Input analog timing modes 1 ~28 and DVI timing modes 1 ~ 28: H-size: 408mm ± 1mm. V-size: 306mm ± 1mm. (Extra 640x350) 1.2 Screen center. a. 1600x1200: H ± 1mm, V ± 1mm. b. Other modes: H ± 1.5mm, V ± 1mm. g3 1.3 Picture position (refer to FIG.2). H-position: ︱ g3-g4 ︱ ≦ 1.5mm. V-position: ︱ g1-g2 ︱ ≦ 1.5mm. g1 g4 306mm g2 408mm FIG. 2 2. Luminance test. 2.
4. Shortcut keys and factory presets 4.1 Shortcut keys: Press the following keys to adjust settings directly, when the OSD is not active. [ 1 ]. Main Menu. Select next input. (Sequence: D-SUB → DVI-A → DVI-D) [ 2 ]. [ UP ] or [ DOWN ] arrow. Directly activate the Contrast menu. Switch to Brightness menu by pushing button [ 2 ]. [ UP ] + [ DOWN ] arrows.
6.2 IC954 EEPROM data see Appendix-B item a.6.3 For the EDID data see Appendix B. VP2000s analog & DVI-A are the same as item h. For the DVI-D input 1 see item i. 7. USB test (VP201s/b only) 7.1 Use a USB test hub such as “UPT2 USB2.0 8-port tester” to test USB up stream and down stream transfers. Each port must pass the test. 7.2 Use a PC to check the USB VID, which should be 0543 , and the PID, which should be 1169 . 7.3 For USB test settings see Appendix E. 8.
Mode No. Mode Name Horizontal Freq. (KHz) Video clock Freq. 11 12 13 14 15 16 17 18 19 20 VESA VESA VESA VESA MAC VESA VESA XGA VESA VESA 800 x 800 x 800 x 800 x 832 x 1024 x 1024 x 1024 x 1024 x 1024 x 600 600 600 600 624 768 768 768 768 768 37.879 48.077 46.875 53.674 49.727 48.363 56.476 58.099 60.023 68.677 40.000 50.000 49.500 56.250 57.285 65.000 75.000 78.084 78.750 94.500 ＋ ＋ ＋ ＋ － － － － ＋ ＋ Sync. Polarity H. total (Dots) 1056 1040 1056 1048 1152 1344 1328 1344 1312 1376 H. sync.
Appendix B: DDC contents. a. 128 bytes of EDID code for VP201s analog.
3. Front Panel Function Control Description Adjusting the Screen Image Use the buttons on the front control panel to display and adjust the OnView® controls which display on the screen. The OnView controls are explained at the top of the next page. Main Menu with OnView controls Front Control Panel shown below in detail Scrolls through menu options and adjusts the displayed control. Also a shortcut to display the Contrast adjustment control screen.
Do the following to adjust the screen image: 1 To display the Main Menu, press button [1]. NOTE: All OnView menus and adjustment screens disappear automatically after about 30 seconds. 2 To select a control you want to adjust, press ▲ or ▼ to scroll up or down the Main Menu. 3 After the control is selected, press button [2]. 4 To adjust the control, press the up ▲ or down ▼ buttons. 5 To save the adjustments and exit the menu, press button [1] twice.
Main Menu Controls Adjust the menu items shown below by using the up ▲ and down ▼ buttons. Control 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.
Control Explanation 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 your computer. See your graphic card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency). NOTE: VESA 1600 x 1200 @ 60 Hz (recommended) means that the resolution is 1600 x 1200 and the refresh rate is 60 Hertz.
Control Explanation Setup Menu displays the menu shown below. The Setup Menu controls are explained below: Language allows you 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.
Control Explanation OSD Background allows you to turn the On-Screen-Display background on or off. OSD Pivot This function is used to rotate the OSD menu, when the display is changed from Landscape to Portrait mode. Memory Recall returns adjustments to the original factory settings if the display is operating in a factory Preset Timing Mode listed in this user guide. Exception: This control does not affect changes made with the User Color control.
4. 4.1 Circuit Description Power supply (DC/DC Converter): 4.1.1 IC251 BA9741 is a switching regulator controller that uses a PWM method. It is used for DC to DC step-down conversion. It converts 24V DC into regulated and stable output voltages of 18V and 5V. 4.1.2 Regulator: IC252 converts 5V into regulated and stable O/P 3.3V. IC253 converts 5V into regulated and stable O/P 1.8V IC255 converts 5V into regulated and stable O/P 3.3V. IC256 converts 5V into regulated and stable O/P 2.5V. 4.
5. 5.1 Adjustment Procedure General. 1. All specifications must be met over line voltage range of 90VAC to 264VAC 50Hz / 60Hz, unless otherwise specified. 2. Operating temperature range is 0oC to 40oC with a relative humidity of 10% or less to 80%. 3. The monitor must be operational in a usable state within 30 minutes after turn-on. 4. All signal levels are measured assuming termination at the monitor’s input jacks or in its characteristic impedance. 5.
5.2 Instrument alignment. 5.2.1 Adjustment procedure.
5.2.2 Video alignment. 5.2.2.1 Initial Conditions 5.2.2.1.1 Set the contrast to 70% and set brightness to 100%.. 5.2.2.1.2 Input a 640x480 / 60Hz 5-block (5-MOSAIC) pattern (input level 100IRE 0.7Vp-p), then adjust the white balance.
5.3 VP201s Firmware Download Procedure (Gm1601 serial) 5.3.1 Set LCD Monitor to Burn In mode (Down key + 2 key +DC power on). 5.3.2 Set LCD Monitor to Factory mode (1 key + DC power on). 5.3.3 Enter Factory Mode (Press up key). 5.3.3.1 Set the color temperature mode to sRGB and press the 2 Key. The R, G, B, Gain value will be adjusted; note the values.. 5.3.3.2 Repeat for each color temperature. 5.3.4 Install Gprobe 5.3.
5.3.
Confidential - Do Not Copy ViewSonic Corporation 24 VP201b/s-1
5.3.7 Connect ISP Tool 5.3.7.
Connect to D-Sub Connect to COM 1 Output 12V 5.3.7.
Connect to COM 1 5.3.7.
Signal cable Connect to D-Sub Confidential - Do Not Copy ViewSonic Corporation 28 VP201b/s-1
5.3.
Set to “SERIAL1”” ” Set to “COM1” Set to “115200” 5.3.8.
Confidential - Do Not Copy ViewSonic Corporation 31 VP201b/s-1
5.3.
5.3.10 Key in “BATCH VP2000BATCH.
5.3.
ISP finishes 5.3.12 5.3.13 5.3.14 Remove ISP tool EEPROM initial (1key + up key + down key + AC Power off/on) Execute Auto White Balance. 5.3.14.1 Set LCD Monitor to Burn In mode (Down key + 2 key +DC power on). 5.3.14.2 Set LCD Monitor to Factory mode (1 key + +DC power on). 5.3.14.3 Enter Factory Mode (press up key). 5.3.14.
(1) Select D-SUB (2) Input a 640x480/60Hz 5-Mosaic pattern (3) Push “up” key to enter factory mode, then select OSD “AutoBI” function. (4) Set color temperature to S-RGB, 9300, 6500, 5400, and 5000; at each setting, adjust the RGB gain and save. (5) Select “CopyToDA”, “CopyToDD” functions. (6) Push the 1 key to exit the OSD (7) Execute the “All mode recall” function. (Push the 2 key + DC power on) 5.3.15 Adjust DOS Mode (1) Set LCD Monitor to Burn In mode (Down key + 2 key + DC power on).
6. Troubleshooting Flow Chart 6.1 No power. Check that CN251 pin1, are approximately 24V Yes No Failure point Check that C281 are 24V 1. Adaptor failure. 2. Disconnected between CN251 and Adaptor. No Failure point FB251, FB251 failure Yes Check that C262 positive is at 5V. No Failure point D251, IC251, L251, Q255 failure Yes Check: 1. IC255 is O/P 3.3V. 2. IC253 is O/P 1.8V. 3. IC256 is O/P 2.5V. 4. IC252 is O/P 3.3V.
6.2 No display on screen (Screen is black, LED is off). AC power on and DC power on Yes Yes Check that C265 positive is at 18V LED is light or not? No Yes Check C276 pin8 is 18V Yes Inverter failure Follow item 6.
6.3 Show “No signal” on screen. Check that signal level of D-sub, DVI-A or DVI-D Yes No Failure point Yes Check the R.G.B and H/V Sync in IC606, IC607 1. IC401 failure. 2. Signal cable is disconnected. IC606, IC607 Failure 6.4 Keypad cannot work. Check the the cable is fully conneted between the interface board and key board No Yes Failure point Failure point Q401. Q402. Q403, Q404 failure The keypad is disconnected.
7.
Item 73 Plastics: 74 75 76 77 78 79 Description HANDLE PE 162*40.5 T1.5 BOTTOM NO501 HANDLE PE 209*18 T1.8 TOP NO501 POWER KNOB POM M270 MIDNIGHT GRAY S8LRB1 RUBBER PAD 25*10*1.5 BLACK STICK RUBBER PAD 22*4 T3 BLK RUBBER PAD 25*25*2 RUBBER SILICON 12*12 T5 ECR/ECN ViewSonic P/N M-MS-0808-2660 M-MS-0808-2662 PL-NB-0707-0192 M-MS-0808-5271 PL-PD-0714-0140 PL-PD-0714-0066 M-MS-0808-2631 Ref.
RECOMMENDED SPARE PARTS LIST (VP201s-1 for "AUO V.
Item 75 Plastics: 76 77 78 79 80 81 Description HANDLE PE 162*40.5 T1.5 BOTTOM NO501 HANDLE PE 209*18 T1.8 TOP NO501 NAME PLATE VSC 3-BIRD LOGO AL 11.07*7.92 POWER KNOB POM 901U 5140 S8LFB1LS RUBBER PAD 22*4 T3 BLK RUBBER PAD 25*25*2 RUBBER SILICON 12*12 T5 ECR/ECN ViewSonic P/N M-MS-0808-2660 M-MS-0808-2662 M-MS-0808-8556 PL-NB-0707-1075 PL-PD-0714-0140 PL-PD-0714-0066 M-MS-0808-2631 Ref.
BOM LIST (VP201b-1 for "AUO Panel") ViewSonic Model Number: VLCDS26064-2W Rev: 1c 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 72 73 74 75 76 77 ViewSonic P/N E-L-0407-1587 E-L-0407-1587 M-SW-0815-0224 M-MS-0808-8555 A-VC-0101-0390 A-VC-0101-0370 A-PC-0106-0150 HW-00002546 M-SCW-0824-0690 M-SCW-0824-0775 M-SCW-0824-0776 M-SCW-0824-0777 M-SCW-082
Item 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 ViewSonic P/N M-SCW-0824-0780 M-CV-0830-2443 #N/A #N/A #N/A #N/A M-CV-0830-2444 #N/A #N/A #N/A #N/A M-CV-0830-2439 #N/A #N/A #N/A #N/A M-CV-0830-2440 #N/A #N/A #N/A #N/A M-CV-0830-2441 #N/A #N/A #N/A #N/A
Item 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 ViewSonic P/N M-MS-0808-8628 HW-00002550 A-00001842 E-R-0405-3195 #N/A E-R-0405-3210 #N/A #N/A #N/A #N/A E-R-0405-7124 #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/
Item 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 ViewSonic P/N #N/A #N/A #N/A E-L-0407-0494 #N/A #N/A #N/A M-MS-0808-9125 #N/A #N/A M-WR-0828-0344 M-WR-0828-0249 M-WR-0828-0388 #N/A #N/A #N/A B-00001843 #N/A #N/A #N/A E-R-0405-7028 E-R-0405-7034 E-R-0405-7037 #N/A #N/A #N/A #N/A #N/A #N/A #N/A E-R-0405-7038 E-R-0405-6685 Ref.
Item 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 ViewSonic P/N #N/A #N/A #N/A #N/A #N/A #N/A #N/A DC-00001459 DC-00001473 E-00002545 B-00002542 E-R-0405-7124 #N/A #N/A #N/A #N/A #N/A Ref. P/N 251030130F 2801978900 2970046602 3070074766 3070075166 3240256100 3861270000 5012046900 5012047200 5052000402 5600110420 0313000000 0341052300 0341059300 0341384300 0341406300 0341632300 Description IC DUAL CCFL INVERTER CONTROLL SSOP-30P TRANSFORMER IT UI-11.
Item ViewSonic P/N Ref. P/N Description 370 E-C-0404-5322 149024701208 CAP AL CP 6.3V 47U M 5*5.5 371 #N/A 149024701233 CAP AL CP 6.3V 47U M 5*5.
Item 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 ViewSonic P/N #N/A E-IC-0401-2927 #N/A #N/A #N/A #N/A #N/A #N/A E-IC-0450-0050 E-IC-0401-2942 #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 Ref.
BOM LIST (VP201s-1 for "AUO Panel") ViewSonic Model Number: VLCDS26064-4W Rev: 1c 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 72 73 74 75 ViewSonic P/N E-L-0407-1587 E-L-0407-1587 M-SW-0815-0224 M-MS-0808-8555 A-VC-0101-0390 A-VC-0101-0370 A-PC-0106-0150 #N/A M-SCW-0824-0690 M-SCW-0824-0775 M-SCW-0824-0776 M-SCW-0824-0777 M-SCW-0824-0784 M-SCW-
Item 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 ViewSonic P/N M-SCW-0824-0782 M-SCW-0824-0779 M-SCW-0824-0780 M-CV-0830-2459 #N/A #N/A #N/A #N/A M-CV-0830-2461 #N/A #N/A #N/A #N/A M-CV-0830-2462 #N/A #N/A #N/A #N/A M-CV-0830-2463 #N/A #N/A #N/A #N/A M-CV-0830-24
Item 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 ViewSonic P/N M-MS-0808-8396 #N/A CB-00001886 #N/A #N/A M-MS-0808-8628 #N/A A-00001842 E-R-0405-3195 #N/A E-R-0405-3210 #N/A #N/A #N/A #N/A E-R-0405-7124 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #
Item 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 ViewSonic P/N #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A E-L-0407-0494 #N/A #N/A #N/A M-MS-0808-9125 #N/A #N/A M-WR-0828-0344 M-WR-0828-0249 M-WR-0828-0388 #N/A #N/A #N/A B-00001843 #N/A #N/A #N/A E-R-0405-7028 E-R-0405-7034 E-R-0405-7037 #N/A #N/A #N/A #N/A #N/A #N/A #N/A E-R-0405-7038 E-R-0405-6685 Ref.
Item 310 311 312 ViewSonic P/N #N/A E-Q-0402-7018 #N/A Ref. P/N 210522000507 211522000405 211522000407 Description TR 40V 0.6A SOT-23 80 TR -40V -0.6A SOT-23 100 TR -40V -0.6A SOT-23 100 313 E-Q-0402-1554 242522500005 FET 60V 0.115A 7.5OHM LL SOT-23 314 #N/A 242522500007 FET 60V 0.
Item ViewSonic P/N Ref. P/N Description 368 #N/A 0619901105 RES ARRAY 1/16W 33 J 8P4R 1206 369 #N/A 0619901112 RES ARRAY 1/16W 33 J 8P4R 1206 370 371 372 #N/A M-LCD-0826-0129 #N/A 0730060412 0730180212 0841110802 CRYSTAL 14.318MHZ 30PPM 30PF 49US CRYSTAL 24MHZ 30PPM 30PF 49US FUSE F/P 5A 125V UL CSA 373 E-C-0404-5322 149024701208 CAP AL CP 6.3V 47U M 5*5.5 374 #N/A 149024701233 CAP AL CP 6.3V 47U M 5*5.
Item 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 ViewSonic P/N #N/A #N/A E-Q-0402-7018 #N/A #N/A #N/A #N/A #N/A E-IC-0401-2925 #N/A #N/A #N/A #N/A #N/A E-IC-0401-2927 #N/A #N/A #N/A #N/A #N/A #N/A E-IC-0450-0050 E-IC-0401-2942 #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 Ref.
8.
EXPLODED PARTS LIST (VP201s-1) ViewSonic Model Number: VLCDS26064-4W Rev: 1c Item ViewSonic P/N Ref.
9.
10.
Main Board Confidential - Do Not Copy ViewSonic Corporation 62 VP201b/s-1
Main Board Confidential - Do Not Copy ViewSonic Corporation 63 VP201b/s-1
Main / Key Board Confidential - Do Not Copy ViewSonic Corporation 64 VP201b/s-1
DVI Board Confidential - Do Not Copy ViewSonic Corporation 65 VP201b/s-1
Power Board Confidential - Do Not Copy ViewSonic Corporation 66 VP201b/s-1
Inverter Board Confidential - Do Not Copy ViewSonic Corporation 67 VP201b/s-1
11.
Main Board (Bottom) Confidential - Do Not Copy ViewSonic Corporation 69 VP201b/s-1
Power Board Confidential - Do Not Copy ViewSonic Corporation 70 VP201b/s-1
Power Board (Bottom) Confidential - Do Not Copy ViewSonic Corporation 71 VP201b/s-1
Inverter Board Confidential - Do Not Copy ViewSonic Corporation 72 VP201b/s-1
Inverter Board (Bottom) Confidential - Do Not Copy ViewSonic Corporation 73 VP201b/s-1
*Readers 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? U nit Ex cellent Fair G ood Bad 1. Precautions and Safety Notices 2. Specification 3. Front Panel Function Control Description 4. Circuit Description 5.
