Service Manual ViewSonic VG500b-1-1 Model No. VLCDS24349-1 15” Color TFT LCD Display (VG500b-1_SM_574 Rev. 1c Feb.
Copyright Copyright ¤ 2003 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 2 3. Front Panel Function Control Description 3 4. Circuit Description 7 5. Adjusting Procedure 14 6. Trouble Shooting Flow Chart 18 7. Recommended Spare Parts List 22 8. Exploded Diagram And Spare Parts List 28 9. Block Diagram 31 10. Schematic Diagrams 34 11.
1. Precautions and Safety Notices 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 to the user. WARNINGS l l l l l l l l This monitor should be operated only at the correct power sources indicated on the label on the rear of the monitor. If you’re unsure of the power supply in your residence, consult your local dealer or Power Company.
2. Specification 2.1PRODUCT SPECIFICATIONS LCD Panel 15.0” TFT Power Management Energy Star compliant VESA DPMS compatible <2W Displayable Resolution XGA, 1024x768 (max.) Pixel Dimension 0.297(H) x 0.297(V) mm LCD Display Color 16.7M color (max.) Viewing Angle CR>10 Horizontal: -60°~+60° Vertical: -55°~+45° Tilt Response Time -10°~-5° 400:1 typical 250:1 minimum 200cd/m² (min) 250cd/m² (typ.) Tr: 7ms, Tf: 23ms Active Display Area 304.1mm(H) x 228.
3. Front Panel Function Control Description Panel adjustment 3-1 Select 1024 x 768@60Hz mode, and Crosshatch pattern 3-2 Press “ Auto image set up” -------Direct access “2” Key 3-3 Brightness set at maximum 3-4 Switch pattern to full screen “pixel on/off” pattern with R, B color off and Green on. Green color level set at level 255. 3-5 Adjust VR01 until whole screen display stable and flicker free.
l Press “ 2 ” button , the OSD will find “ Factory Init. ” Then “▲” button for 3 seconds , the OSD show “ Memory Recall “ to initial All Mode.
l White Balance Press “▲” “ ▼ “and “ 1 “ buttons simultaneously for 3 seconds to set White Balance Mode. Please set the screen on 1024x768 @ 60 Hz resolution 5 white block pattern l Power Lock Press “ ▼ and “ 1 “ buttons simultaneously for 10 seconds , and the Power will be locked. Repeat the action , and the power will be unlocked.
l OSD Lock Press “▲ “ 1 “ buttons simultaneously for 10 seconds, and the OSD will be locked. Repeat the action and the OSD will be unlocked.
4. Circuit Description 4.1D-SUB CONNECTOR PINASSIGNMENT Pin No. Symbol Signal Description 1 R RED 0.7vp-p (VIDEO) 2 G GREEN 0.7vp-p (VIDEO) 3 B BLUE 0.7vp-p (VIDEO) 4 N.C. 5 6 GND GND GROUND GROUND 7 GND GROUND 8 GND GROUND 9 VCC_+5V 10 GND GROUND 11 12 N.C. DDC_SDA DDC1/2B TTL 13 DDC_SCL DDC1/2B TTL 14 VGA_VSYNC VSYNC TTL positive or negative 15 VGA_HSYNC HSYNC TTL positive or negative PC +5V 4.2 Main DC+12V Input (J800 on I/F Board) Pin No.
4.4 INTERNAL CONNECTOR & PIN ASSIGNMENT XGA Interface Board (PWB-0535) CON1 : Connect with Control board Pin No.
CON5 : Output to panel Pin No.
35 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth 36 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth 37 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth 38 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth Pin No.
20 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V 21 GND Ground 22 GND Ground 23 EB7 Blue data signal of even pixel 24 EB6 Blue data signal of even pixel 25 EB5 Blue data signal of even pixel 26 EB4 Blue data signal of even pixel Pin No.
4 DC+5V DC+5V 5 GND Ground 7 BRT Brightness adjustment (Low is max., High is Min.) 8 CCFL_EN 9 GND 10 DC+12V 11 GND 12 SENSOR Backlight lamps enable (ON/high, OFF/low) Ground DC+12V Ground Detect audio I/P signal P1 : Connect to inverter Pin No. Symbol Function 1 DC+12V 2 GND Ground 3 BRT Brightness adjustment (Low is Max., High is Min.) 4 DC+5V 5 CCFL_EN DC+12V DC+5V Backlight lamps enable (ON/high, OFF/low) CN701 : Connect to control board, control the audio Pin No.
Recoding Process : l Choose a correct mode name l Press [Caps Lock]then key in the bar code number STHTAA00001, And then Press [Enter]. The screen shows a green color sentence "Receive DDC Data OK" l Be sure both the bar code number and DDC2 data are correct. l After set power off --on, press[F5]to make sure the DDC1 and bar code number are correct. Checking Process : l l l After SET ON ,Press [F5]then verify DDC1 data .Press[F6] to verify DDC2 data .
5.
l 3.
5-2 Disassembly of Key Board PWB-0536, Inverter Board PWB-0538 , Main Board PWB-0535 and DC-AMP &Audio Board PWB-0537 l Unscrew eight screws that secure shielding plate and remove LCD chassis PWB-0538 INVERTER PCB PWB-0537 AUDIO & DC AMP PWB-0536 PCB PWB-0535 KEY -PAD PCB MAIN PCB l Unscrew four screws that secure Power & Audio Board and disconnect three connectors to remove Main Board and Inverter Board.
l Unscrew three screws that secure Inverter Board and disconnect three connectors to remove Power & Audio Board and LCD Panel PANEL LIGHTS To INVERTER POWER I/ P WIRE FFC1 WIRE PANEL TO MAIN PCB P/N 5784610007 l Unscrew four screws that secure Main Board and disconnect four connectors to remove Power & Audio Board and LCD Panel.
6. Trouble Shooting Flow Chart No picture Appear Does the LED light up Yes No Next LED display is amber No The Voltage across No C801 is 12V Replace F801 Yes No Replace U801 No Replace U802 The Voltage across No Q702 is 5V Replace Q702 Check O/P of U801 at pin7, pin10 Yes Picture shows Reset the Scalar (U5 and U1) by pushing the power key or re-plugging the DC 12V cable Scalar (U5) Hangs Still no Picture Yes No Is it entering into power saving mode Yes Restart PC signal to ensure H. V.
Next The Voltage of I001 No #2 is 3.
The Ver. Or Hor. Sync.
No sound Check if Audio jack properly insert Yes Check if mute key is pressed YES Press mute key again to release NO Check if CN701 is connected to U701 properly YES U701 #1 voltage is 12V No No Check U801 output #7 is normal Replace U801 Yes Check U701 output #2,#4,#10,#12 are normal No Replace U701 ViewSonic Corporation 21 Confidential – Do Not Copy VG500b
7.
VG500b BOM LIST BOM LIST PCB- POWER & AUDIO PWB-0537 ASSEMBLY Item ViewSonic P/N Ref. P/N Description Location Q'ty 1 #N/A 5782510001 CONNECTOR S5B-PH-K CN701,CN830 2 2 #N/A 5230005491 CAPACITOR MONOLITHIC SMD REEL 0.
BOM LIST PCB- POWER & AUDIO PWB-0537 ASSEMBLY Item ViewSonic P/N Ref. P/N Description 14 E-D-0403-2072 6615009858 DIODE ZENER Location 15 #N/A 6613003753 DIODE SMD SWITCHING 1N4148 MMSZ5232B 16 E-D-0403-2126 6613000554 DIODE SWITCHING 17 E-FS-0410-0112 5054430090 FUSE SMD 63V/3A BAV99 75V 0.
BOM LIST Item 19 PCB- POWER & AUDIO ViewSonic P/N Ref.
BOM LIST PCB- POWER & AUDIO PWB-0537 ASSEMBLY Item ViewSonic P/N Ref. P/N Description Location 61 #N/A 5134315009 RESISTOR.THICK FILM CHIP 0603 1/16W 15R R60 Q'ty 1 62 #N/A 5134310509 RESISTOR.THICK FILM CHIP 0603 1/16W 1MR R65 1 63 #N/A 5136006800 RESISTOR THICK FILM CHIP430R 0.22R 1/4W 0805 R72 1 64 #N/A 5134315309 RESISTOR.THICK FILM CHIP 0603 1/16W 15K R73 1 65 #N/A 5134120209 RESISTOR.THICK FILM CHIP 0603 1/16W 2K 1% R76 1 66 #N/A 5134127029 RESISTOR.
VG500B(VLCDS24349-1W ) Item ViewSonic P/N 1 C-FP-0301-0896 2 M-CV-0830-2341 3 C-BC-0302-0437 4 M-MS-0808-8273 5 M-MS-0808-8278 6 M-MS-0808-8279 7 M-MS-0808-8275 8 PL-PS-0715-0169 9 M-MS-0808-8277 10 PL-BT-0706-0110 11 M-MS-0808-8284 12 M-MS-0808-8276 13 M-MS-0808-8285 14 M-CV-0830-2340 15 M-MS-0808-8283 16 M-MS-0808-8272 17 M-MS-0808-8271 18 PL-PD-0714-0072 19 PL-PD-0714-0073 20 PL-PD-0714-0074 21 M-MS-0808-8282 22 M-MS-0808-8351 23 M-MS-0808-8280 24 M-MS-0808-8281 25 A-AD-0114-0193 26 M-MS-0808-8287 27 M-M
8.
VG500b Exploded Parts List NO 1 2 3 4 5 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 S-1 S-2 S-2 S-2 S-2 S-3 S-3 S-4 S-4 S-5 S-5 S-5 S-5 S-6 S-6 Designation F/C Bird Logo LCD Panel (RA) TAIWAN (RB) CHINA Flexible Flat cable LCD Chassis Interface Shield Mounting Bracket Back Cover Codekeeper Name Plate F/C2 Button Indicate Speaker Ass’Y (L) Speaker Ass’Y (R) KENSHING TON HINGE L HINGE R Mount Rubber Hinge Cover View Sonic Logo Neck 2 Neck Plate Bas
NO S-6 S-6 S-7 S-8 S-9 Designation SCREW ISO MACHINE FLAT HEAD M4X12L SCREW ISO MACHINE FLAT HEAD M4X8L SCREW PRWS M3x4 S-TITE S-ZN-CC TS PAN CLR S-TITE M3x10 S-ZN SCREW TAPPING FLAT HEAD-2 M3X6 S-ZN-CC ViewSonic Corporation ViewSonic P/N M-SCW-0824-6729 M-SCW-0824-6728 M-SCW-0824-6730 M-SCW-0824-6731 M-SCW-0824-6732 30 Identification No 7004261616 7004261116 7131160252 7132161456 7034160656 Qty 4 6 3 1 4 Remark Hinge r mounting bracket ffc plate b/c + chassis base plate Confidential – Do Not Copy
9. Block Diagram 9-1 Inverter Board Circuit The diagram of inverter board circuit is shown in Appendix (PWB-0538). The inverter supplies power for the LCD panel back light. 9-2 Power supply Board Circuit Please refer to 2.0 power Schematic sheet in Appendix. The 12Vdc from adaptor output is fed into J800 as regulated power for U801 (AO4403), and as inverter main power on pin 1 of CN830. U801 provides 5Vdc to main board.
VG500b VDDA 9.2V I3 L012 RT9164 CG Q009 5V DC PPWR0 Q010 C151 U008 Q006 VDDG 18VDC D004 Q004 PPWR1 Q007 RT34063A L014 C142 Q008 VEEG -6V D005 32 PPWRO Confidential – Do Not Copy 12V DC C145 H V PPWR0 PPWR1 OK OK 1 1 NO OK 0 0 OK NO 0 0 NO NO 0 0 VCOM 3.45V I4 RT916A32 CG L015 VR001 1K 0.
12Vdc Form Adaptor U801 Audio Confidential – Do Not Copy Power AN7522 MP1410 DC-DC Control Mute Volume con.
10. Schematic .
VIEWSONIC Confidential - Do Not Copy ViewSonic Corporation 35 VG500b
Confidential - Do Not Copy ViewSonic Corporation 36 VG500b
VIEWSONIC Confidential - Do Not Copy ViewSonic Corporation 37 VG500b
VIEWSONIC Confidential - Do Not Copy ViewSonic Corporation 38 VG500b
VIEWSONIC Confidential - Do Not Copy ViewSonic Corporation 39 VG500b
VIEWSONIC Confidential - Do Not Copy ViewSonic Corporation 40 VG500b
VIEWSONIC Confidential - Do Not Copy ViewSonic Corporation 41 VG500b
VIEWSONIC 27 Confidential - Do Not Copy ViewSonic Corporation 42 VG500b
11.
Main Board ViewSonic Corporation 44 Confidential – Do Not Copy VG500b
Main Board ViewSonic Corporation 45 Confidential – Do Not Copy VG500b
ViewSonic Corporation 46 Confidential – Do Not Copy VG500b
Control Board ViewSonic Corporation 47 Confidential – Do Not Copy VG500b
*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 after reading VG500b 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.
