ViewSonic VG720 - 17" LCD Monitor Service Manual
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ViewSonic VG720 - 17" LCD Monitor Service Manual

17” color tft lcd display
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Service Manual

ViewSonic VG720
Model No VS10791
17" Color TFT LCD Display
Manufacture Date: Aug-10-05
- 1 –
ViewSonic Corporation
Confidential - Do Not Copy
VG720

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Summary of Contents for ViewSonic VG720 - 17" LCD Monitor

  • Page 1: Service Manual

    Service Manual ViewSonic VG720 Model No VS10791 17” Color TFT LCD Display Manufacture Date: Aug-10-05 - 1 – ViewSonic Corporation Confidential - Do Not Copy VG720...

  • Page 2: Revision History

    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 manual or otherwise, without the prior written permission of ViewSonic Corporation.

  • Page 3: Table Of Contents

    6. Troubleshooting Flow Chart 7. Recommended Spare Parts List 8. Exploded Diagram And Spare Parts List 9. Disassemble Process 10. Block Diagram 11. Schematic Diagram 12. PCB Layout Diagram - 3 – ViewSonic Corporation Confidential - Do Not Copy VG720...

  • 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. - 4 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • 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.” - 5 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • 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.” - 6 – ViewSonic Corporation Confidential - Do Not Copy VG720...

  • Page 7: Specification

    Operating: 0°C to +40°C Temperature Storage: -20°C to +60°C Energy Star compliant VESA Power Management DPMS compatible <1 W Input Voltage : 90V~264V Power Consumption: 48 Watts(Max.) 43 Watts(Typ.) - 7 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 8 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 - 8 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 9 TMDS positive differential input, channel 0 Logic Ground Reserved 20 Reserved. No connection Reserved 21 Reserved. No connection Logic Ground RXC+ TMDS positive differential input, reference clock RXC- TMDS negative differential input, reference clock - 9 – ViewSonic Corporation Confidential - Do Not Copy VG720...

  • Page 10: Front Panel Control And Indicators

    Also a shortcut to toggle analog and digital connection. Power Standby Power On/Off Green – ON Power LED (Front Head) Orange – Active Off Dark = Soft Power Switch OFF - 10 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 11 • 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.) - 11 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 12 2. To adjust selected color, press ▼ ▲ 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. - 12 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 13 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 instructions on changing the resolution and refresh rate (vertical frequency).
  • Page 14 OSD Background allows the user to turn the OSD background On or Off. Memory Recall returns the adjustments back to factory settings if the display is operating in a factory Preset Timing Mode listed in the Specifications of this manual. - 14 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 15 5 seconds. • OSD Unlock: Press and hold “[1], & ▲” again for 10 seconds. Remark : All the short cuts function are only available while OSD off - 15 – ViewSonic Corporation Confidential - Do Not Copy VG720...

  • Page 16: 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 TSUM56AK Keyboard EPROM EPROM - 16 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 17 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 - 17 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 18 Digital Core Power 1.8V 13 38 41 47 96 116 AIC1084-33PM (U702): DC power convert, used to 5v convert 3.3v. LT1117-18(U701): DC power convert, used to 5v convert 3.3v. - 18 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 19 8 , range of gain from -40dB to 36 dB. The function of each pin and the inside circuit diagram are as follows: Circuit Diagram - 19 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 20 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. - 20 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 21 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. - 21 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 22 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) - 22 – ViewSonic Corporation Confidential - Do Not Copy VG720...

  • Page 23: 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 - 23 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 24 (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 - 24 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 25 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. - 25 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 26 800 x 600 @ 72Hz, 48.1kHz 832 x 624 @ 75Hz, 49.7kHz 832 x 624 @ 75Hz, 49.7kHz 1024 x 768 @ 60Hz, 48.4kHz 1024 x 768 @ 60Hz, 48.4kHz - 26 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 27 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) - 27 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 28 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) - 28 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 29 Check and see if the image boundary is within the screen frame. If not, readjust by the following steps: (a)Select and enter “Manual Image Adjust” function on OSD Main Menu. - 29 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 30 But we still have to check with the general test pattern to make sure every secondary is compliant with the specification. - 30 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 31 - 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 - 31 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 32 P3 to Signal Generator P2 to LPT Cable 3 Firmware Upgrade Procedure Step 1. Let VG720/VG920 set to be connected with AC cable and VGA cable. Step 2.Execute the MSstar ISP tool. - 32 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 33 Step 4. Click “Connect” button. (On this step, if the connection is successful, the “Entry 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. - 33 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 34 Step 7. Click “Auto” button. Execute the flashing action by clicking the “Run” button. Step 8. If the flashing F/W has been completed, “Ok” message will be showed on the right TextBox. - 34 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 35 3.2.4 Plug Power Adapter to Fixture. 3.2.5 Connect Power Cord to VG720/VG920 Monitor. 3.2.6 Connect PC to the additional monitor. Power Adapter P3 DVI-DVI Cable VGA Cable P1 to LTP Cable - 35 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 36 3.3 DDC Key In Procedure Sep1.Select and execute DDc Key In program - 36 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 37 Sep2:Inpute the S/N and execute “Enter” - 37 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 38 - 38 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 39 Sep3:Key the “Enter” and write the data - 39 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 40 Sep4:If ddc program OK and show “data compare ok” - 40 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 41 5.7 Packing For Shipping - 41 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 42 EPE COVER 45G 88609 B PE BAG 45G 88607 44G3778 1 44G3778 2 AUDIO CABLE 89G 173 56507 POWER CORD 89G402A18N LS SIGNAL CABLE 89G 728GAA902 DVI CABLE 89G1748GAA 11 - 42 – ViewSonic Corporation Confidential - Do Not Copy VG720...

  • Page 43: Troubleshooting Flow Chart

    6. Troubleshooting Flow Chart - 43 – ViewSonic Corporation Confidential - Do Not Copy VG720...

  • Page 44: Recommended Spare Parts List

    Recommended Spare Part List VG720 BOM list T780KQ6HKGVWABP ViewSonic Universal Item Ref. P/N Description Location Q'ty number# - 44 – ViewSonic Corporation Confidential - Do Not Copy VG720...
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  • Page 61: Exploded Diagram And Spare Parts List

    8. Exploded Diagram And Spare Parts List - 61 – ViewSonic Corporation Confidential - Do Not Copy VG720...
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  • Page 64: Disassemble Process

    Disassemble the 4 fixed screws of the panel, remove the main frame, as showed in the following the picture 18,19. Do not damage the cable of the panel. That’s all. The disassemble process of the unit is over. - 64 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 65 9.1.3 Show pictures Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6 Picture 7 Picture 8 - 65 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 66 Picture 9 Picture 10 Picture 11 Picture 12 Picture 13 - 66 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 67 Picture 14 Picture 15 Picture 16 Picture 17 Picture 18 Picture 19 Picture 20 - 67 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 68 Stand A’ssy Disassemble Process Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6 - 68 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 69 Picture 7 Picture 8 Picture 9 Picture 10 Picture 11 Pictures 12 - 69 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 70 Picture 13 Picture 14 Picture 15 Picture 16 Picture 17 Picture 17 - 70 – ViewSonic Corporation Confidential - Do Not Copy VG720...

  • Page 71: Block Diagram

    Block Diagram Flash Scaler TSUM56AK (Include:ADC,OSD,MCU etc) - 71 – ViewSonic Corporation Confidential - Do Not Copy VG720...

  • Page 72: Schematic Diagram

    0.1uF C718 0.1uF C717 R727 PMBS3904 C720 C719 R728 0.1uF 10uF/16V 1/16W Title NC/0.1uF NC/10uF/16V NC/4K7 TSUM57AK Size Document Number POWER Date: Monday , May 30, 2005 Sheet - 72 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 73 KEY _MENU KEY _RIGHT KEY _LEFT PMBS3904 POWER KEY _C OUT-L+ OUT-R+ CONN OUT-L- OUT-R- Title TSUM57AK CONN Size Document Number SCALER Date: Thursday , June 30, 2005 Sheet - 73 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 74 C449 C450 C451 C452 C453 C454 Title D425 TSUM57AK 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF RLZ36B Size Document Number INPUT Date: Monday , May 30, 2005 Sheet - 74 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 75 GND AOC (Top Victory) Electronics Co., Ltd. Title 2. FOR 17" 4 LAMPS INVERTER is signal GND Size Document Number PWPC1742QDV1P(715G1492-1) Date: Tuesday , July 05, 2005 Sheet - 75 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 76 C935 CN901 0.001uF/250V CONN AOC (Top Victory) Electronics Co., Ltd. Title 1.POWER OUTPUT 12V & 5 V Size Document Number PWPC1742QDV1P(715G1492-1)   Date: Tuesday , July 05, 2005 Sheet - 76 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 77 600 OHM C638 C639 C640 C641 LOUT- LOUT+ C630 0.001uF C631 C632 Title AUDIO BD FOR TPA3002/TPA3003 0.001uF 0.001uF Size Document Number 715L1178-H Date: Monday , July 04, 2005 Sheet - 77 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 78 SW004 SW005 SW006 SW007 SW008 MUTE CONN AOC (Top Victory) Electronics Co., Ltd. Title KEY PAD (For Viewsonic) Size Document Number CONTROL KEY PAD (Switch) Date: Thursday , May 05, 2005 Sheet - 78 – ViewSonic Corporation Confidential - Do Not Copy...

  • Page 79: Pcb Layout Diagram

    12. PCB Layout Diagram 12.1 MAIN BOARD PCB TOP VIEW - 79 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 80 12.2 MAIN BOARD PCB BUTTON VIEW - 80 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 81 12..3 KEYBOARD TOP VIEW 12.4 KEYBOARD BUTTON VIEW - 81 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 82 12.5 POWER PCB TOP VIEW - 82 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 83 12.6 POWER PCB BUTTON VIEW - 83 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 84 12.6 AUDIO PCB TOP VIEW - 84 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 85 12.6 AUDIO PCB BUTTON VIEW - 85 – ViewSonic Corporation Confidential - Do Not Copy VG720...
  • Page 86 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 suggestion to the Director, Quality System & Process (marc.maupin@viewsonic.com) - 86 – ViewSonic Corporation...

This manual is also suitable for:

Vg920Vs10790Vs10791Vg720

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