ViewSonic VS10791-1W Service Manual
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ViewSonic VS10791-1W Service Manual

ViewSonic VS10791-1W Service Manual

17” color tft lcd display
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Service Manual

ViewSonic VG720-1
Model No. VS10791-1W
17" Color TFT LCD Display
(VG720-1_SM Rev. 1a Dec. 2005)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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Summary of Contents for ViewSonic VS10791-1W

  • Page 1: Service Manual

    Service Manual ViewSonic VG720-1 Model No. VS10791-1W 17” Color TFT LCD Display (VG720-1_SM Rev. 1a Dec. 2005) ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583...

  • Page 2: Revision History

    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

    4. Circuit Description 5. Adjusting Procedure 6. Trouble Shooting Flow Chart 7. Recommended Spare Parts List 8. Exploded View And Exploded Parts List 9. Block Diagram 10. Schematic Diagrams 11. PCB Layout Diagrams Viewsonic Corporation Confidential - Do Not Copy VG720-1...

  • 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. Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 5 Do and that may cause “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.” Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • 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.” Confidential - Do Not Copy ViewSonic Corporation VG720-1...

  • Page 7: Specification

    50 – 75 Hz. 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.) Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 8 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 Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • 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 Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 10 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 Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • 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.) Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • 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. Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • 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. Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 15 [1] + [▲] display for 5 seconds. • OSD Unlock: Press and hold “[1], & ▲” again for 10 seconds. Remark : All the short cuts function are only available while OSD off Confidential - Do Not Copy ViewSonic Corporation VG720-1...

  • 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 Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 17 EMI filter and 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 Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 18 103 115 VDDC 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. Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 19 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: Circuit Diagram Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • 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. Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • 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. Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 22 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) Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 23 4.5 POWER BLOCK FUNCTION DESCRIPTION Inverter Block Function Confidential - Do Not Copy ViewSonic Corporation VG720/B...
  • Page 24 Power Block Function Confidential - Do Not Copy ViewSonic Corporation VG720/B...
  • Page 25 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 Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 26 (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 Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 27 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. Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 28 800 x 600 @ 72Hz, 48.1kHz 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 Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 29 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) Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 30 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) Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 31 Test Pattern: Horizontal & Vertical Line Thickness Pattern 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. Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 32 But we still have to check with the general test pattern to make sure every secondary is compliant with the specification. Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 33 - 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 Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 34 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. Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 35 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. Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 36 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. Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 37 PC by LPT Cable. 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 Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 38 3.3 DDC Key In Procedure Sep1.Select and execute DDc Key In program Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 39 Sep2:Inpute the S/N and execute “Enter” Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 40 Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 41 Sep3:Key the “Enter” and write the data Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 42 Sep4:If ddc program OK and show “data compare ok” Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 43 5.7 Packing For Shipping Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 44 MONITOR T780KQ6HKGVWABP 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 Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 45 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. Confidential - Do Not Copy ViewSonic Corporation VG720/B...
  • Page 46 1.3 Show pictures Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6 Picture 7 Picture 8 Confidential - Do Not Copy ViewSonic Corporation VG720/B...
  • Page 47 Picture 9 Picture 10 Picture 11 Picture 12 Picture 13 Confidential - Do Not Copy ViewSonic Corporation VG720/B...
  • Page 48 Picture 14 Picture 15 Picture 16 Picture 17 Picture 18 Picture 19 Picture 20 Confidential - Do Not Copy ViewSonic Corporation VG720/B...
  • Page 49 Stand A’ssy Disassemble Process Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6 Confidential - Do Not Copy ViewSonic Corporation VG720/B...
  • Page 50 Picture 7 Picture 8 Picture 9 Picture 10 Picture 11 Pictures 12 Confidential - Do Not Copy ViewSonic Corporation VG720/B...
  • Page 51 Picture 13 Picture 14 Picture 15 Picture 16 Picture 17 Picture 17 Confidential - Do Not Copy ViewSonic Corporation VG720/B...

  • Page 52: Troubleshooting Flow Chart

    6. Troubleshooting Flow Chart Confidential - Do Not Copy ViewSonic Corporation VG720-1...

  • Page 53: Recommended Spare Parts List

    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. Confidential - Do Not Copy...
  • Page 54 BOM LIST (VG720-1) ViewSonic Model Number: VS10791-1W Rev: 1a Serial No. Prefix: PT3 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty B-00003717 AUPC980A8P AUPC BOARD B-00003718 CBPC780KQ6VWP CONVERSINON BOARD B-00003719 KEPC980KB8SMTP KEY BOARD B-00003720 PWPC1742QDV1P POWER BOARD #N/A...
  • Page 55 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty CB-00003768 89G 728HAA902 SIGNAL CABLE A-00003716 89G402A18N LS POWER CORD CB-00003725 89G1748LAA 11 DVI SIGNAL CABLE CB-00003726 95G8014 16921 WIRE HARNESS CB-00003724 95G8018 30 95 CABLE #N/A M1G 130 6120...
  • Page 56 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 65G0603105 12 CHIP CAP 1UF. C613 #N/A 65G0603105 12 CHIP CAP 1UF. C614 #N/A 65G0603105 12 CHIP CAP 1UF. C616 #N/A 65G0603105 12 CHIP CAP 1UF. C619 #N/A 65G0603105 12 CHIP CAP 1UF.
  • Page 57 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 61L0603100 CHIPR 10 OHM 1/10W R465 #N/A 61L0603100 CHIPR 10 OHM 1/10W R466 #N/A 61L0603100 CHIPR 10 OHM 1/10W R467 #N/A 61L0603100 CHIPR 10 OHM 1/10W R468 #N/A 61L0603100...
  • Page 58 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 61L0603472 CHIP 4.7KOHM +-5% 1/10W R707 #N/A 61L0603472 CHIP 4.7KOHM +-5% 1/10W R712 #N/A 61L0603472 CHIP 4.7KOHM +-5% 1/10W R725 #N/A 61L0603510 CHIP 51OHM 5% 1/10W R702 #N/A 61L0603513...
  • Page 59 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 71G 56Z601 2.0X1.2 100M=600OHM FB402 #N/A 71G 56Z601 2.0X1.2 100M=600OHM FB403 #N/A 71G 56Z601 2.0X1.2 100M=600OHM FB404 #N/A 71G 56Z601 2.0X1.2 100M=600OHM FB405 #N/A 71G 56Z601 2.0X1.2 100M=600OHM FB406...
  • Page 60 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 61G 58080 WT NTCR NR901 #N/A 61G152M398 64 RES. R918 #N/A 63G 10747410S 0.47UF +-10% 250VAC C903 #N/A 63G210J3342B2 0.33uF 250V PMS TAIYANG C221 #N/A 63G211J334 AB 0.33UF 5% 160V...
  • Page 61 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty E-00001873 84G 56 1 FUSE 2A 250V F901 #N/A 93G 50460 13 BRIDGE DIODE DB901 #N/A 93G 50460502 BRIDGE KBP206G 2A 800V DB901 #N/A 93G1100 1052T BA159GPT DO-41 DIODE 1A...
  • Page 62 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 65G0805104 32 CHIP 0.1UF 50V X7R 0805 C927 #N/A 65G0805104 32 CHIP 0.1UF 50V X7R 0805 C928 #N/A 65G0805104 32 CHIP 0.1UF 50V X7R 0805 C929 #N/A 65G0805105 22...
  • Page 63 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 95G 90 23 TINCOATEDCOPPER J919 #N/A 95G 90 23 TINCOATEDCOPPER J921 #N/A 715G1492 1 PWPC #N/A 705G 780 5720P D921/D922 ASS'Y #N/A 51G 200 1 #N/A 90G6240 2 HEAT SINK...
  • Page 64 8. Exploded Diagram and Exploded Parts List ViewSonic Corporation Model Title Date Rev: Confidential - Do Not Copy ViewSonic Corporation VG720/B...
  • Page 65 EXPLODED PARTS LIST (VG720-1) ViewSonic Model Number: VS10791-1W Rev: 1a Serial No. Prefix: PT3 Item ViewSonic P/N Ref. P/N Description Q'ty #N/A 34G1698-KR-B BEZEL #N/A 34G1699-KR-B REAR COVER #N/A 34G1700-AKD-B COSMETIC TOP #N/A 34G1701-KD-B COSMETIC BOTTOM #N/A 33G4915-KR-L FUNCTION BUTTON...
  • Page 66 EXPLODED PARTS LIST (VG720-1 STAND-ASS'Y P/N LIST) Item ViewSonic P/N Ref. P/N Description Q'ty #N/A 34G1691-KR-B VESA COVER #N/A 34G1702-KR-B STAND FRONT #N/A 34G1703-KR-B STAND REAR #N/A 34G1694-KD-B BASE FRONT TOP #N/A 34G1695-KD-B BASE FRONT BOTTOM #N/A 34G1696-KR-B BASE #N/A...

  • Page 67: Block Diagram

    9. Block Diagram Confidential - Do Not Copy ViewSonic Corporation VG720/B...
  • Page 68 R726 NC/4K7 C716 on_Panel 4.7K 1/16W C715 Q707 on_Panel_12V PMBS3904 0.1uF C718 0.1uF C717 R727 PMBS3904 C720 C719 R728 0.1uF 10uF/16V 1/16W NC/0.1uF NC/10uF/16V NC/4K7 ViewSonic Corporation POWER Model Title Date Rev: Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 69 LED_G LED_A Volume Q404 C431 OUT-L- OUT-R- KEY _AUTO KEY _MENU KEY _RIGHT KEY _LEFT PMBS3904 POWER KEY _C CONN OUT-L+ OUT-R+ OUT-L- OUT-R- CONN ViewSonic Corporation SCALER Model Title Date Rev: Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 70 BAV99 BAV99 BAV99 BAV99 BAV99 1/16W ESD_5V C447 C448 C449 C450 C451 C452 C453 C454 D425 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF RLZ36B ViewSonic Corporation Model INPUT Title Date Rev: Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 71 1/10W 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 Model INVERTER Title Date Rev: Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 72 IC903 0.1uF FUSE 1/8W R932 Q903 KIA431A-AT/P 1/10W 2PC945P R913 C908 R919 1/10W 10uF 1/10W R933 C930 2.4K 1/10W C933 C935 CN901 0.001uF/250V CONN ViewSonic Corporation A-D POWER Model Title Date Rev: Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 73 C633 NC LOUT- C644 C645 LOUT+ FB610 FB612 CONN 600 OHM 600 OHM C638 C639 C640 C641 LOUT- LOUT+ C630 0.001uF C631 C632 0.001uF 0.001uF ViewSonic Corporation AUDIO Model Title Date Rev: Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 74 LCD ON/OFF KEY 2 KEY 1 KEY DOWN KEY UP VOLUME - VOLUME + SW001 MUTE SW002 SW003 SW004 SW005 SW006 SW007 SW008 CONN ViewSonic Corporation KEY PAD Model Title Date Rev: Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 75 11. PCB Layout Diagram 11.1 MAIN BOARD PCB TOP VIEW Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 76 11.2 MAIN BOARD PCB BUTTON VIEW Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 77 11.3 KEYBOARD TOP VIEW 11.4 KEYBOARD BUTTON VIEW Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 78 11.5 POWER PCB TOP VIEW Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 79 11.6 POWER PCB BUTTON VIEW Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 80 11.7 AUDIO PCB TOP VIEW Confidential - Do Not Copy ViewSonic Corporation VG720-1...
  • Page 81 11.8 AUDIO PCB BUTTON VIEW Confidential - Do Not Copy ViewSonic Corporation VG720-1...

  • Page 82: Schematic Diagrams

    Add.: Fax: Tel: 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) Confidential - Do Not Copy...

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