ViewSonic VA503b-1 Service Manual
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ViewSonic VA503b-1 Service Manual

ViewSonic VA503b-1 Service Manual

15” color tft lcd display
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Service Manual

ViewSonic VA503b-1
VA503m-1
Model No. VS11248
15" Color TFT LCD Display
(VA503b-1_ VA503m-1_SM Rev. 1c Nov. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA – (800) 888-8583

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  • Page 1: Service Manual

    Service Manual ViewSonic VA503b-1 VA503m-1 Model No. VS11248 15” Color TFT LCD Display (VA503b-1_ VA503m-1_SM Rev. 1c Nov. 2006) ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA – (800) 888-8583...
  • Page 2 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

    Front Panel Function Control Description Circuit Description Adjustment Procedure Troubleshooting Flow Chart Recommended Spare Parts List Exploded Diagram and Exploded Parts List Block Diagram 10. Schematic Diagrams 11. PCB Layout Diagrams ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...

  • Page 4: Precautions And Safety Notices

    3. Keep wires away from high voltage, high temperature components and sharp edges. 4. Keep wires in their original position so as to reduce interference. 5. Usage of this product please refer to also user’s manual. ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 5 “Mura.” not touch the surface of the polarizer. Taking out the monitor by grasping the LCD Take out the monitor with cushions panel. That may cause “Mura.” ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 6 “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.” ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...

  • Page 7: Specification

    CB / TCO99 / UL/cUL / FCC-B / ICES 003 / Argentina-TUV/S / NOM / EPA Energy Star / Regulation TUV/Ergo / ISO134062 / TUV/GS / CE / GOST-R / SASO / BSMI / PSB / C-Tick / CCC / RoHS / WEEE ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...

  • Page 8: Viewsonic Corporation

    ½ cycle of AC power is randomly missing at nominal input The power supply shall not produce audible noise that Power Supply Acoustics would be detectable by the user. Audible shall define to be ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 9 >10 kOhm Maximum power output (Electric) 1 W @ < 8% distortion Signal to Noise Ratio 50 dB Frequency response 500 Hz – 20 Khz Distortion < 8 % THD (@1kHz) ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 10 Cable type / length 3.5mm stereo cable / 1.8m length Note: There is no guarantee <1 W power consumption in Audio DPMS Active Off mode, when the Audio Cable is connected ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 11 Response Time 12 ms (Tr= 8.5 ms, Tf = 3.5 ms) (Typ) 10%-90% @ Ta=25°C 16 ms (Tr= 11 ms, Tf = 5 ms) (max) Panel Defects Please see Panel Quality Specifications. ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 12 Response Time 16 ms (Tr= 4 ms, Tf = 12 ms) (Typ) 10%-90% @ Ta=25°C 25 ms (Tr= 7 ms, Tf = 18 ms) (max) Panel Defects Please see Panel Quality Specifications. ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 13 ● Power Supply, and Grounding Artifacts : No visible artifacts in any specified video mode within the horizontal or vertical frequency range of the monitor Temperature Drift : Image shall not drift or lose fine-tune adjustment ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 14 ViewSonic The reference for the bezel is the black color (VA503m) and the midnight gray color (VA503b) chip provided by ViewSonic. Neck, Base, and Rear Cover Color The color difference between any two cabinet components shall be less than 0.80 “Delta E”, in the 1976 CIE L*a*b Colorspace.
  • Page 15 Green video input Blue video input No Connection Ground Red video ground Green video ground Blue video ground H/V sync ground No connection (SDA) Horizontal sync (Composite sync) Vertical sync (SCL) SIGNAL LEVEL ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...

  • Page 16: Front Panel Function Control Description

    3. Front Panel Function Control Description ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 17 • If necessary, make small adjustments using H. POSITION and V. POSITION until the screen image is completely visible. (The black border around the edge of the screen should barely touch the illuminated “active area” of the LCD display.) ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...

  • Page 18: Main Menu Controls

    9300K-Adds blue to the screen image for cooler white (used in most office settings with fluorescent lighting). 6500K-Adds red to the screen image for warmer white and richer red. 5400K-Adds green to the screen image for a darker color. ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 19 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. See your graphics card’s user guide for ®...
  • Page 20 Preset Timing Mode listed in the Specifications of this manual. Exception: This control does not affect changes made with the User Color control, Language Select or Power Lock setting. ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 21 White Balance (Not shown on user’s guide) (keep pushing 5 sec) [1] + [▼] Power Lock [1] + [▲] OSD Lock Remark : All the short cuts function are only available while OSD off ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...

  • Page 22: Circuit Description

    4.2 MAIN BOARD BLOCK FUNCTION DESCRIPTION The main board contains panel control logic, brightness control logic, DDC and DC convert DC circuit and so on. PWPC board Backlight and Panel TSUM16AK Keyboard EPROM EPROM ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 23 Filter Start Circuit R903, R904,R905 CN902 Over Control IC Voltage Protect ON/OF OSC and MOSFET DC Convert Output Q203 Circuit Circuit Lamp Over ON/OFF Feedback Voltage Control Circuit Control IC ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 24 TPA3003D2 (U601): The TPA3003D2 is a audio amplifier IC,3-W efficient, driving speakers as low as 8 , range of gain from -40dB to 36 dB. The function of each pin and the inside circuit diagram are as follows: ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 25 Circuit Diagram ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 26 DC voltage that sets the gain of the amplifier. VREF Analog reference for gain control section. 2.5-V Reference for analog cells, as well as reference for unused audio input when V2P5 using single-ended inputs. ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 27 This unconnected pin ensures adequate creepage − distance. Ensure a clean and Connected to the high−voltage rail, this pin injects a lossless startup constant current into the VCC capacitor during the startup sequence sequence. ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 28 Error amplifier 1 output 2IN+ Positive input for error amplifier Output 1 dead time/soft start 1DTC 2IN- Positive input for error amplifier setting 1OUT Output 1 Timing latch setting Ground Reference voltage output (2.5v) ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...

  • Page 29: Adjustment Procedure

    5400 color temp. parameter is Wx = 0.335 0.03;Wy = 0.350 0.03; Y = 250 20 cd/m D MEM.CHANNEL10 ( SRGB color): 6500 color temp. parameter is Wx = 0.313 0.03;Wy = 0.329 0.03; Y = 220 20 cd/m ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 30 (6) Adjust the BLUE of color3 on factory window until chroma 7120 indicator reached the value B=100 (7) Repeat above procedure ( item 4,5,6) until chroma 7120 RGB value meet the tolerance =100 5 ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 31 2).Change to each mode in turn and wait for the monitor finish auto-alignment and save press before change to next mode. 3).Until all of modes are adjusted,exit OSD menu and press POWER OFF to exit factory mode. ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 32 640 x 480 @ 67Hz, 35.0kHz 640 x 480 @ 72Hz, 37.9kHz 640 x 480 @ 75Hz, 37.5kHz 640 x 480 @ 85Hz, 43.27kHz 720 x 400 @ 70Hz, 31.5kHz 800 x 600 @ 56Hz, 35.1kHz ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 33 The screen must have White Balance White & Black Pattern the pure white and black Figure 9 pattern, no other color. Fine Line Morie Pattern (Figure1) Gray Scale Pattern (Figure2) ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 34 Horizontal & Vertical Thickness Pattern R. Color Pattern (Figure 4) (Figure 3) G. Color Pattern (Figure 5) B. Color Pattern (Figure 6) Full White Pattern (Figure 7) Dark Screen Pattern (Figure 8) ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 35 (a)Select and enter “Manual Image Adjust” function on OSD Main Menu. (b)Then, select and enter “Horizontal Size” or “Horizontal/Vertical Position” function to adjust the video boundary to be full scanned and within screen frame. ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 36 After final QC step, we have to erase all saved changes again and restore the factory defaults. You should do “All Mode Reset” again. Power Off Monitor Turn off the monitor by pressing “Power” button. ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 37 2.1 Connect P2 of Fixture with printer port of PC by LPT Cable. 2.2 Connect P1 of Fixture with VA503/VA703/VA903 Monitor by VGA Cable. 2.3 Plug Power Adapter to Fixture. 2.4 Connect Power Cord to VA503/VA703/VA903 Monitor. ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 38 Step 3. Click “Config” button . Select the Port Type: LPT1 and the Base Addr : 0x378 on “Communication Setting” flame, and then the Speed: 47 on “E2PROM Device Setting” flame ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 39 ISP Mode” Dialog will be showed. If not, the error dialog will be done.) Step 5. Click “Device” button. Select the “PMC25LV010” or “SST25VF010” viewed on your set. Step 6. Click “Read” button. Select the object bincode on your corresponding directory. ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 40 Step 8. If the flashing F/W has been completed, “Ok” message will be showed on the right TextBox. Step 9. Unplug and replug power cord of VA503/VA703/VA903 set and then check the OSD operation and image on srceen. ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 41 PC by LPT Cable. 3.2.3 Plug Power Adapter to Fixture. 3.2.4 Connect Power Cord to VA503/VA703/VA903 Monitor. 3.2.5 Connect PC to the additional monitor. Power Adapter VGA Cable P1 to LTP Cable ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 42 3.3 DDC Key In Procedure Sep1.Select and execute DDc Key In program ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 43 Sep2:Inpute the S/N and execute “Enter” ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 44 ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 45 Sep3:Key the “Enter” and write the data ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 46 Sep4:If ddc program OK and show “data compare ok” ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 47 Disassemble the 4 fixed screws of the panel, remove the main frame, as showed in the following the picture 15,16,17. Do not damage the cable of the panel. That’s all. The disassemble process of the unit is over. ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 48 1.3 Show pictures Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6 ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 49 Picture 7 Picture 8 Picture 9 Picture 10 Picture 11 Picture 12 ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 50 Picture 13 Picture 14 Picture 15 Picture 16 ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 51 Picture 17 ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...

  • Page 52: Packing Procedure

    Packing Procedure First picture second picture third picture fourth picture fifth picture sixth picture seventh picture eighth picture ninth picture Tenth picture ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...

  • Page 53: Troubleshooting Flow Chart

    6. Troubleshooting Flow Chart ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...

  • Page 54: Recommended Spare Parts List

    Remark 2: All revised RSPLs with newly added items or any change made should be highlighted and correlated with the ECN/ECR approved by ViewSonic Corporation. This is to eliminate repeated cross checks of each item between this version and prior versions.
  • Page 55 Remark 2: All revised RSPLs with newly added items or any change made should be highlighted and correlated with the ECN/ECR approved by ViewSonic Corporation. This is to eliminate repeated cross checks of each item between this version and prior versions...
  • Page 56 BOM LIST (VA503B) ViewSonic Model Number: VS11248 Rev: 1d Serial No. Prefix: Q78 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty B-00008194 CBPC560KV5VWP CONVERSION BOARD B-00005797 KEPC560KE1P KEPC BOARD B-00005798 PWPC1521HDV1P POWER BOARD 11G6055 1 SQUARE FRAME 12G 808 1...
  • Page 57 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty DC-00008160 J40G 15T709 4A ID VA503M P-00005817 J44G5001 1 EPS(L) P-00005818 J44G5001 2 EPS(R) P-00008046 J44G5001709 1C CARTON DC-00006645 J41G7801709 7B DC-00008161 J41G780170914A INSERT CARD DC-00008162 J70G1501709 5A CD MANUAL...
  • Page 58 BOM LIST (VA503M) ViewSonic Model Number: VS11248 Rev: 1c Serial No. Prefix: Q79 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty B-00005822 AUPC560B9P AUDIO BOARD B-00008196 CBPC560KV5VWAP CONVERSION BOARD B-00005824 KEPC560KD9P KEPC BOARD B-00005825 PWPC1521HDV2P POWER BOARD 11G6055 1...
  • Page 59 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty DC-00006660 J41G7801709 8B J41G780170914A INSERT CARD J52G8001 9 NON-WOVEN FABRICS J52G8001 10 NON-WOVEN FABRICS J70G1501709 6A CD MANUAL ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...

  • Page 60: Exploded Diagram And Exploded Parts List

    8. Exploded Diagram and Exploded Parts List (VA503b) ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 61 EXPLODED PARTS LIST (VA503b-1) ViewSonic Model Number: VS11248 Rev: 1a Serial No. Prefix: Q78 Item ViewSonic P/N Ref. P/N Description Q'ty 33G5019 KD C FUNC. BUTTON C-00005799 34G1877B4Z B BEZEL 23G3178709 6A VSC LOGO KEPC560KD9P KEPC BOARD Q1G 330 6120...
  • Page 62 EXPLODED SPARE PARTS LIST (VA503b-1) ViewSonic Model Number: VS11248 Rev: 1b ITEM ViewSonic P/N Ref. P/N Description 33G5019 KD C FUNC. BUTTON 34G1877B4Z B BEZEL 23G3178709 6A VSC LOGO B-00005824 KEPC560KD9P KEPC BOARD HW-00003750 Q1G 330 6120 SCREW 750GLH50X1731N000V HSD150MX17 15" LCD PANEL...
  • Page 63 (VA503m) ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 64 EXPLODED PARTS LIST (VA503m-1) ViewSonic Model Number: VS11248 Rev: 1a Serial No. Prefix: Q79 Item ViewSonic P/N Ref. P/N Description Q'ty 33G5019 KD C FUNC. BUTTON C-00005799 34G1877B4Z B BEZEL 23G3178709 6A VSC LOGO B-00005824 KEPC560KD9P KEPC BOARD Q1G 330 6120...
  • Page 65 EXPLODED SPARE PARTS LIST (VA503m-1) ViewSonic Model Number: VS11248 Rev: Serial No. Prefix: Q79 ITEM ViewSonic P/N Ref. P/N Description 33G5019 KD C FUNC. BUTTON 34G1877B4Z B BEZEL 23G3178709 6A VSC LOGO B-00005824 KEPC560KD9P KEPC BOARD HW-00003750 Q1G 330 6120...
  • Page 66 Packing for Shipping (VA503b) ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 67 PACKING PART LIST (VA503b-1) ViewSonic Model Number: VS11248 Rev: 1a Item ViewSonic P/N Ref. P/N Location Q'ty J44G5001709 1A CARTON P-00005819 50G 600 2/3 HANDLE1/2 P-00005642 45G 76 28 V3 PE BAG DC-00005804 70G1501709 1A CD MANUAL DC-00005803 41G7801709 7A...
  • Page 68 Packing for Shipping (VA503m) ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 69 PACKING PART LIST (VA503m-1) ViewSonic Model Number: VS11248 Rev: 1a Item ViewSonic P/N Ref. P/N Location Q'ty P-00005831 J44G5001709 2A CARTON 50G 600 2/3 HANDLE1/2 P-00005642 45G 76 28 V3 PE BAG J70G1501709 2A CD MANUAL J41G7801709 8A P-00005643 45G 88606...

  • Page 70: Block Diagram

    9. Block Diagram ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...

  • Page 71: Schematic Diagrams

    C718 C718 0.1uF 0.1uF C717 C717 R727 R727 PMBS3904 PMBS3904 0.1uF 0.1uF 10uF/16V 10uF/16V ¡¡ ¡¡ 1/16W 1/16W NC/0.1uF NC/0.1uF NC/10uF/16V NC/10uF/16V NC/4K7 NC/4K7 ViewSonic Corporation POWER Model Title Date Rev: ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 72 0.1uF SCL_VGA ¡¡ ¡¡ 1/16W 1/16W SDA_VGA ¡¡ ¡¡ 1/16W 1/16W M24C02 M24C02 DDCA_SDA MLL5232B 5.6V MLL5232B 5.6V MLL5232B 5.6V MLL5232B 5.6V DDCA_SCL DDC_WP ViewSonic Corporation INPUT Model Title Date Rev: ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 73 CN403 ¡¡ ¡¡ 1/16W 1/16W AUDIO_STBY R432 R432 ¡¡ ¡¡ 1/16W 1/16W AUDIO_MUTE KEY_B KEY_A OUT-L+ OUT-R+ LED_G LED_A ViewSonic Corporation Volume Q404 Q404 OUT-L- OUT-R- KEY_AUTO KEY_MENU KEY_RIGHT KEY_LEFT PMBS3904 PMBS3904 POWER KEY_C CONN CONN OUT-L+ OUT-R+ SCALER OUT-L-...
  • Page 74 R208 0 1/10W D209 1N4148 R209 0 1/10W D207 1N4148 D206 R227 D208 R228 1N4148 1/4W 1N4148 1/4W is power GND is signal GND ViewSonic Corporation INTERVER Model Title Date Rev: ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 75 QDI 17 3.3V CPT 17 3.3V 3.3V INNOLUX 15 HannStar 15 3.3V 3.3V CPT 15 3.3V 3.3V LG 15 3.3V 3.3V 3.3V Innolux 17" ViewSonic Corporation PANEL INTERFACE Model Title Date Rev: ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 76 C212 C212 C211 C211 C209 C209 C210 C210 C213 C213 100pF 100pF 1.0uF 1.0uF 1.0uF 1.0uF 0.1uF 0.1uF C208 C208 100pF 100pF 470uF/16V 470uF/16V ViewSonic Corporation AUDIO Model Title Date Rev: ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 77 120 OHM A_GND SPKR_L+ SPKR_R+ FB01 FB01 SPK-R SPK-R 120 OHM 120 OHM 100pF 100pF CONN CONN 100pF 100pF A_GND SPK-L SPK-L A_GND ViewSonic Corporation KEY PAD Model Title Date Rev: ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...

  • Page 78: Pcb Layout Diagrams

    11. PCB Layout Diagram ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 79 ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 80 MAIN BOARD PCB BUTTON VIEW ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 81 POWER PCB VIEW ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 82 ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 83 KEYBOARD TOP VIEW KEYBOARD BUTTON VIEW AUDIO PCB TOP VIEW ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 84 AUDIO PCB TOP VIEW AUDIO PCB BUTTON VIEW ViewSonic Corporation VA503b-1_ VA503m-1 Confidential - Do Not Copy...
  • Page 85 Company: Add: Tel: Fax: 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) ViewSonic Corporation VA503b-1_ VA503m-1...

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