Viewsonic VG500b-1 Service Manual 1c

Service Manual
ViewSonic VG500b-1-1
Model No. VLCDS24349-1
15Color TFT LCD Display
ViewSonic
(VG500b-1_SM_574 Rev. 1c Feb. 2004
381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583
Copyright 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.
Disclaimer
ViewSonic makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular purpose. 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.
Trademarks
Optiquest is a registered trademark of ViewSonic Corporation. ViewSonic is a registered trademark of ViewSonic Corporation. All other trademarks used within this document are the property of their respective owners.
2003 by ViewSonic Corporation. All rights reserved. No part of this publication may be
¤
Revision History
Revision Date Description Of Changes Approval
1a 10/01/02 Initial Release DCN-2350 K.Yang
1b 10/31/02 Revise DCN-2350
1c 02/10/04 Change Scaler to MRT MV2 DCN-4213 Angela Luh
C.Shen
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TABLE OF CONTENTS
1. Precautions and Safety Notices
2. Specification
3. Front Panel Function Control Description
4. Circuit Description
5. Adjusting Procedure
6. Trouble Shooting Flow Chart
7. Recommended Spare Parts List
8. Exploded Diagram And Spare Parts List
9. Block Diagram
10. Schematic Diagrams
11. PCB Layout Diagrams
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14
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22 28 31 34
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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
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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.
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Use only the special power adapter that comes with this monitor for power input.
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Do not try to repair the monitor by yourself, as it contains no user-serviceable parts. This monitor should only be repaired by a qualified technician.
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Do not remove the monitor cabinet. There are high-voltage parts inside that may cause electric shock to human bodies.
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Stop using the monitor if the clean is damaged. Have it checked by a service technician.
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Put your monitor only in a clean, cool, dry environment. If it gets wet, unplug the power cable immediately and consult your local dealer.
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Always unplug the monitor local cleaning it. Clean the cabinet with a soft, dry cloth. Apply non-ammonia based cleaner onto the cloth, not directly onto the glass screen.
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Do not place heavy objects on the monitor or power cord.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety visual inspections and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Before replacing any of these components read the parts list in this manual carefully. The use of substitute replacement parts, which do not have the same safety characteristics as specified in the parts list, may create shock, fire, or other hazards.
SERVICE NOTES
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When replacing parts or circuit boards, clamp the lead wires around terminals before
soldering.
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Keep wires away from high voltage, high temperature components and sharp edges.
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Keep wires in their original position so as to reduce interference.
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Adjustment of this product please refer to the user’ manual.
SERVICE TOOLS & EQUIPMENT REQUIRED
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SIGNAL GENERATOR: Chroma 2237 or equivalent
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MULTIMETER Fluke 45 or equivalent
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SCREW DRIVER
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OSCILLOSCOPE Tektronik TDS3054 digital oscilloscope or equivalent
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SOLDER IRON
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2. Specification
2.1PRODUCT SPECIFICATIONS
LCD Panel 15.0” TFT Power Management Energy Star compliant VESA
Displayable Resolution XGA, 1024x768 (max.) Pixel Dimension 0.297(H) x 0.297(V) mm LCD Display Color 16.7M color (max.)
DPMS compatible <2W
Viewing Angle CR>
10
Horizontal: -60°~+60° Vertical: -55°~+45°
Tilt -10°~-5°
400:1 typical
Contrast Ratio Brightness
250:1 minimum 200cd/m² (min) 250cd/m² (typ.)
Response Time Tr: 7ms, Tf: 23ms Active Display Area 304.1mm(H) x 228.1mm(V)
Temperature Operating: 0°C~+40°C (240h)
Storage: -20°C~+60°C (240h)
Compliance UL, CSA, FCC, CE, CB, BSMI, Energy Star, TUV,
Semko, Nemko, Fimko, Demko, DHHS, MPRII, TCO95, GOST-R, C-Tick, VCCI, CCC
Power Input Voltage: 100~240 Vac
Consumption: 35Watts (Max.)
2.2 SUPPORTED MODES
Primary Preset: VESA 1024 x 768 @ 60Hz
Factory Preset Modes:
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1. VGA 640x350 @ 70Hz, 25.176MHz
2. VESA 640x480 @ 60Hz, 25.175MHz
3. MAC 640x480 @ 67Hz, 31.500MHz
4. VESA 640x480 @ 72Hz, 31.50MHz
5. VESA 640x480 @ 75Hz, 31.50MHz
6. VESA 720x400 @ 70Hz, 28.320MHz
7. VESA 800x600 @ 56Hz, 36.00MHz
8. VESA 800x600 @ 60Hz, 40.00MHz
9. VESA 800x600 @ 72Hz, 50.00MHz
10. VESA 800x600 @ 75Hz, 49.5MHz
11. MAC 832x624 @ 75Hz, 57.272MHz
12. VESA 1024x768 @ 60Hz, 65MHz
13. VESA 1024x768 @ 70Hz, 75.000MHz
14. VESA 1024x768 @ 72Hz, 78.000MHz
15. MAC 1024x768 @ 75Hz, 80.000MHz
16. VESA 1024x768 @ 75Hz, 78.750MHz
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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.
3-5 Adjust VR01 until whole screen display stable and flicker free.
Green color level set at level 255.
Function Test and Alignment Procedure
15” LCD MONITOR MODEL: VG500b
Test Equipment
Color Video Signal & Pattern ( XGA 1024 x 768 @ 60 Hz 5 white
Hot Key
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ssAll Mode Reset
block Pattern )
Press “ and “ power “ buttons simultaneously and “Power on “ with signal hold on for 3 seconds. Then the left OSD screen will show “Software Version “
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Press “ ” button , the OSD will find “ Factory Init. ”
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Then “” button for 3 seconds , the OSD show “ Memory Recall “ to initial All Mode.
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Burn In Mode
Press “ “ button , the OSD will show “Burn In Mode Setting ”
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Then set “” or “ “ buttons , you can find “ set Burn In Mode ” Information about this monitor
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White Balance
Press “” “ “and “ “ buttons simultaneously for 3 seconds to set White Balance Mode.
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Please set the screen on 1024x768 @ 60 Hz resolution 5 white block pattern
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Power Lock
Press “ and “ “ buttons simultaneously for 10 seconds , and
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the Power will be locked. Repeat the action , and the power will
be unlocked.
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OSDLock
Press “▲ “ “ buttons simultaneously for 10 seconds, and the
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OSD will be locked. Repeat the action and the OSD will be unlocked.
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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 GND GROUND 6 GND GROUND 7 GND GROUND 8 GND GROUND
9 VCC_+5V PC +5V 10 GND GROUND 11 N.C. 12 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
4.2 Main DC+12V Input (J800 on I/F Board)
Pin No.
Symbol Function
1 GND Ground
2 DC+12V Main DC+12V Input
3 GND Ground
4.3 Audio Input Jack (J701 on I/F Board)
Pin No.
Symbol Function
1 Ground
2 L_CH_Audio Input
3 R_CH_Audio Input
4 L_CH_Audio Return
5 R_CH_Audio Return
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4.4 INTERNAL CONNECTOR & PIN ASSIGNMENT
XGA Interface Board (PWB-0535)
CON1 : Connect with Control board
Pin No. Symbol Function
1 Mute
2 SP- Adjust audio volume smaller 3 SP+ Adjust audio volume louder 4 Menu Call out or close the OSD menu or come back to the
5 Down Choose the next one item or value 6 Up Choose the last one item or value 7 Sel Select 8 GND Ground
9 Amber Indicate the system in power saving mode 10 Green Indicate the system in active mode 11 GND Ground 12 Power Power on/off control port
OSD, Audio Mute Function Button
previous menu
CON3 : Connect to the PWB-0537, which is power/audio board
Pin No. Symbol Function
1 SENSOR Detect audio I/P signal 2 GND Ground 3 +12V DC+12V 4 GND Ground 5 CCFL_EN Backlight lamps ON(high)/Off(Low) control 6 GPIO2/PWM2 Brightness adjustments (Low Max./ Hi. Min.) 7 MUTE+ Audio Must control (High means SPK off, Low means On) 8 GND Ground
9 +5V DC+5V 10 +5V DC+5V 11 STDBY Audio Stand-by control (Hi means stand-by, Low means Normal) 12 VOLUME Speaker volume control (0V means Sound off, 1.2V means MAX.)
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CON5 : Output to panel
Pin No. Symbol Function
1 GND Ground 2 GND Ground 3 CLKH- Sampling Clock for line pixels 4 GND Ground 5 GND Ground 6 OB7 Blue data signal of odd pixel 7 OB6 Blue data signal of odd pixel 8 OB5 Blue data signal of odd pixel
9 OB4 Blue data signal of odd pixel 10 OB3 Blue data signal of odd pixel 11 OB2 Blue data signal of odd pixel 12 OB1 Blue data signal of odd pixel 13 OB0 Blue data signal of odd pixel 14 GND Ground 15 OG7 Green data signal of odd pixel 16 OG6 Green data signal of odd pixel 17 OG5 Green data signal of odd pixel 18 OG4 Green data signal of odd pixel 19 OG3 Green data signal of odd pixel 20 OG2 Green data signal of odd pixel 21 OG1 Green data signal of odd pixel 22 OG0 Green data signal of odd pixel 23 GND Grounding 24 OR7 Red data signal of odd pixel 25 OR6 Red data signal of odd pixel 26 OR5 Red data signal of odd pixel 27 OR4 Red data signal of odd pixel 28 OR3 Red data signal of odd pixel 29 OR2 Red data signal of odd pixel 30 OR1 Red data signal of odd pixel 31 OR0 Red data signal of odd pixel 32 GND Ground 33 GND Ground 34 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth
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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. Symbol Function
39 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth
40 GND Ground
41 GND Ground
42 GND Ground
43 GND Ground
44 EPOL O/E reference voltage selection
45 HMS2_E Even pixel inverter for power saving and reducing EMI
46 HMS1_O Odd pixel inverter for power saving and reducing EMI
47 DHS_LP Latch pulse for per line
48 STH1 Trigger the first pixel per line
49 GND Ground
50 GND Ground
CON6 : Output to panel
Pin No. Symbol Function
1 GND Ground 2 GND Ground 3 VEEG DC-6V for frame dark 4 VEEG DC-6V for frame dark 5 VDDG DC+18V for frame white 6 VDDG DC+18V for frame white 7 CLKV Sampling Clock for frame line 8 STV1 Trigger the first line per frame
9 VDDD DC_3.3V for panel VCC 10 VDDD DC_3.3V for panel VCC 11 VDDD DC_3.3V for panel VCC 12 VDDD DC_3.3V for panel VCC 13 VDDD DC_3.3V for panel VCC 14 VDDD DC_3.3V for panel VCC 15 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V 16 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V 17 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V 18 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V 19 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V
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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. Symbol Function
27 EB3 Blue data signal of even pixel 28 EB2 Blue data signal of even pixel 29 EB1 Blue data signal of even pixel 30 EB0 Blue data signal of even pixel 31 GND Ground 32 EG7 Green data signal of even pixel 33 EG6 Green data signal of even pixel 34 EG5 Green data signal of even pixel 35 EG4 Green data signal of even pixel 36 EG3 Green data signal of even pixel 37 EG2 Green data signal of even pixel 38 EG1 Green data signal of even pixel 39 EG0 Green data signal of even pixel 40 GND Ground 41 ER7 Red data signal of even pixel 42 ER6 Red data signal of even pixel 43 ER5 Red data signal of even pixel 44 ER4 Red data signal of even pixel 45 ER3 Red data signal of even pixel 46 ER2 Red data signal of even pixel 47 ER1 Red data signal of even pixel 48 ER0 Red data signal of even pixel 49 GND Ground 50 GND Ground
POWER/AUDIO Board (PWB-0537)
JP2 : Connect to the I/F Board
Pin No. Symbol Function
1 Volume Speaker volume control (0V sound off, 1.2V sound Max.) 2 Stdby Audio standby control (High standby, Low normal) 3 DC+5V DC+5V
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4 DC+5V DC+5V 5 GND Ground
7 BRT Brightness adjustment (Low is max., High is Min.) 8 CCFL_EN Backlight lamps enable (ON/high, OFF/low)
9 GND Ground 10 DC+12V DC+12V 11 GND Ground 12 SENSOR Detect audio I/P signal
P1 : Connect to inverter
Pin No. Symbol Function
1 DC+12V DC+12V
2 GND Ground
3 BRT Brightness adjustment (Low is Max., High is Min.)
4 DC+5V DC+5V
5 CCFL_EN Backlight lamps enable (ON/high, OFF/low)
CN701 : Connect to control board, control the audio
Pin No. Symbol Function
1 L- L_CH_SP_-Signal
2 L+ L_CH_SP_+Signal
3 GND_S1 Ground
4 R+ R_CH_SP_-Signal
5 R- R_CH_SP_+Signal
DDC Recorder User Manual
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Connect the recorder (with Keyport II )to the printer port on your PC.
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Insert on the diskette into your PC's floppy drivers, then turn on the PC power.
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A setup main menu will be appear as below :
Select DDC Function Mode
[1
[2 Auto Replace DDC Date [3 Bar Code : xtttddsssss [4 [5 [F5] : Check DDC1 [F6] : Check DDC2 [6
[7] Mode Name : L5CNSE29.HWP [8] Serial NO : sssss [9] DDC Year : 2003
[A] DDC Weeks : 01
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Recoding Process :
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Choose a correct mode name
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Press [Caps Lock]then key in the bar code number STHTAA00001, The screen shows a green color sentence "Receive DDC Data OK"
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Be sure both the bar code number and DDC2 data are correct.
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After set power off --on, press[F5]to make sure the DDC1
and bar code number are correct.
Checking Process :
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After SET ON ,Press [F5]then verify DDC1 data .Press[F6] to
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process ,either DDC1 orDDC2 should appear a green color sentence
"Receive DDC Data OK", and which will be disappeared after 10 second
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The following is an example of DDC data :
DDC Data Received : STHTAA00001
And then Press [Enter].
verify DDC2 data .During checking
*DDC 0 1 2 3 4 5 6 7 8 9 A B C D E F 0000 00 FF FF FF FF FF FF 00 5A 63 0A B4 01 01 01 01 0010 1A 0C 01 03 08 1E 17 78 2A 9D 9E 99 58 4C 93 26 0020 21 4C 54 BF EE 00 61 40 01 01 01 01 01 01 01 01 0030 01 01 01 01 01 01 64 19 00 40 41 00 26 30 18 88 0040 36 00 30 E4 10 00 00 18 00 00 00 FF 00 31 31 50 0050 30 32 32 36 30 30 30 37 39 0A 00 00 00 FD 00 32 0060 4B 1E 3E 08 00 0A 20 20 20 20 20 20 00 00 00 FC 0070 00 56 47 35 30 30 62 0A 20 20 20 20 20 20 00 43
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