ViewSonic VP2650WB - 26" LCD Monitor User manual

ViewSonic VP2650WB-1
Model No. VS11997
26” Color TFT LCD Display
(VP2650wb-1_SM Rev. 1b May. 2008)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - [phone]
Service Manual

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Copyright
Copyright © 2008 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.
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.
Product disposal at end of product life
The lamp in this product contains mercury. Please dispose of in accordance with local, state or
federal laws.
Revision History
Revision SM Editing Date ECR Number Description of Changes Editor
1b 5/28/2008 Revise hinge/base P/N and Add CJC RSPL Jamie Chang
1a 3/17/2008 Initial Release Jamie Chang

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TABLE OF CONTENTS
1. Precautions and Safety Notices ......................................................................................... 1
2. Specification ....................................................................................................................... 4
3. Front Panel Function Control Description ..................................................................... 15
4. Circuit Description ............................................................................................................. 21
5. Adjusting Procedure.......................................................................................................... 27
6. Trouble Shooting Flow Chart ............................................................................................ 50
7. Block Diagrams ................................................................................................................ 56
8. Schematic Diagrams ........................................................................................................ 57
9. PCB Layout Diagrams ...................................................................................................... 73
10. Exploded Diagram And Spare Parts List........................................................................ 77
11. Recommended Spare Parts List .................................................................................... 80

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1. Precautions and Safety Notices
Precautions:
This monitor is manufactured and tested on a ground principle that user’s safety comes first.
However, improper used or installation may cause damage to the monitor as well as to the user.
WARNINGS:
●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 you residence, consult your
local dealer or Power Company.
●Use only the special power adapter that comes with this monitor for power input.
●Do not try to repair the monitor by yourself, as it contains no user-serviceable parts.
Only the qualified technician can repair it.
●Do not remove the monitor cabinet. There are high-voltage parts inside that may cause electric
shock to human bodies.
●Stop using the monitor if the cabinet is damaged. Have it checked by a service technician.
●Put your monitor only in a lean, cool, dry environment. If it gets wet, unplug the power cable
immediately and consult your closed dealer.
●Always unplug the monitor before cleaning it. Clean the cabinet with a clean, dry cloth.
Apply non-ammonia based cleaner onto the cloth, not directly onto the glass screen.
●Do not place heavy objects on the monitor or power cord.
Safety Notices:
1. Make sure your working environment is dry and clean, and meets all government safety
requirements.
2. Ensure that other persons are safe while you are servicing the product.
3. DO NOT perform any action that may cause a hazard to the customer or make the product unsafe.
4. Use proper safety devices to ensure your personal safety.
5. Always use approved tools and test equipment for servicing.
6. Never assume the product’s power is disconnected from the mains power supply. Check that it is
disconnected before opening the product’s cabinet.
7. Modules containing electrical components are sensitive to electrostatic discharge (ESD). Follow
ESD safety procedures while handling these parts.
8. Some products contain more than one battery. Do not disassemble any battery, or expose it to high
temperatures such as throwing into fire, or it may explode.
9. Refer to government requirements for battery recycling or disposal.
Service Notes
●When replacing parts or circuit boards, clamp the lead wires around terminals before
soldering.
●Keep wires away from high voltage, high temperature components and sharp edges.
●Keep wires in their original position so as to reduce interface.
● Adjustment of this product please refer to the user’s manual.

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HANDING AND PLACING METHODS
Correct Methods: Incorrect Methods:
Only touch the metal frame of the LCD panel or
the front cover of the monitor. Do not touch the
surface of the polarizer.
Surface of the LCD panel is pressed by fingers
and that may cause “Mura.”
Take out the monitor with cushions Taking out the monitor by grasping the LCD
panel. That may cause “Mura.”

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Correct Methods: Incorrect Methods:
Place the monitor on a clean and soft foam
pad.
Placing the monitor on foreign objects. That
could scratch the surface of the panel or cause
“Mura.”
Place the monitor on the lap, the panel surface
must be upwards.
The panel is placed facedown on the lap. That
may cause “Mura.”

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2. Specification
2.1Product definition and specification
Product Name ViewSonic VP2650Wb
Oracle P/N VP2650WB
VP2650WB-EU
VP2650WB-CN
Model Number VS11997
OSD Languages
English
French
German
Spanish
Italian
Finnish
Russian
Japanese
Korean
Traditional Chinese
Simplified Chinese
TFT LCD Panel and Model # CPT CLAA260WU09
Scalar Genesis 5862H
Input Signal Analog x1 / Digital x1
Sync Compatibility Separate Sync / Composite Sync / SOG
Adapter Internal Power Board
Power Cable (Refer to APPENDIX B) Yes
15 pin mini D-SUB
A
nalog Cable (1.8 m, black), with PC
2001 and Hot Plug Detect &DDC
(Detached cable; refer the Appendix A)
Yes
DVI-D Cable(1.8m, black) with PC 2001
(refer to Appendix A) Yes
Audio Cable(1.8m, black) with PC 2001 No
MIC Cable(1.8m, black) with PC 2001 No
USB Cable (V2.0)
(1.8m, black) with PC 2001 Yes
ViewSonic CD Wizard
ViewSonic Quick Start Guide
English French
German Dutch
Finnish Swedish
Italian Spanish
Greek Russian
Czech Hungarian
Turkish Polish
Romania Bulgaria
Slovakia Croatia
Serbia Slovenia

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Portuguese Arabic
Japanese Traditional Chinese
Korean Simplified Chinese
Screen Protector Mylar Yes
Foot Protector plastic Yes, for left-front and right-front foot
Service Insert (Refer to Segment 5.9.3) For Region code = M units only
Vista Installation Guide Flyer
(Refer to Segment 5.9.1) Yes
Energy Star Sticker (Refer to F8.2) Yes
POP Sticker (Refer to Segment 5.8.3) Yes
Warranty Card For Region code = G units only
Warranty Carton Sticker (refer to F8.1) For Region code = G units only
PE bag of Carton For Region code = G units only

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GENERAL specification
Test Resolution & Frequency 1920 x 1200 @ 60Hz
Test Image Size Full Size
Contrast and Brightness Controls Factory Default:
Contrast = 70%, Brightness = 100%
VIDEO INTERFACE
Input Connector (refer the Appendix A) Analog = DB-15 (Analog)
Digital = DVI-D (Digital)
Default Input Connector Defaults to the first detected input
Video Cable Strain Relief Equal to twice the weight of the monitor for five minutes
Video Cable Connector Pin out Refer to Appendix A;
Compliant DDC/2B and DDC/CI
Video Signals
Video RGB (Analog)
Separate Sync / Composite Sync / SOG
TMDS (Digital)
Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)
Maximum PC Video Signal 950 mV with no damage to monitor
Maximum Mac Video Signal 1250 mV with no damage to monitor
Sync Signals TTL
DDC/2B
Compliant with version 1.3;
The DDC communication shall not interrupt when power
off.
DDC/CI
Compliant with Revision 1.1;
The DDC communication shall not interrupt when power
off.
Digital link protection HDCP
Sync Compatibility Separate Sync / Composite Sync / SOG
Video Compatibility Shall be compatible with all PC type computers,
Macintosh computers, and after market video cards
Resolution Compatibility Refer to Segment 4-5
Exclusions Not compatible with interlaced video
USB INTERFACE
Connector
Up stream:
USB B type female connector x1
Down stream
USB A type female connector x4
Power Source 5Vdc (internal power board; refer to segment 4.4)
Power saving function The USB function shall keep working under power saving mode as below,

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Display mode USB Hub
On On
Power Saving On
Off Off
Compatibility USB 2.0 certified

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POWER SUPPLY
Internal Power Supply 5E.0DV02.001
Input Voltage Range 90 to 264 VAC
Input Frequency Range 47 to 63 Hertz
Short Circuit Protection Output can be shorted without safety issue
Over Current Protection 5.0A typical at 24VDC( Protect when short circuit)
Leakage Current 3.5mA (Max) at 264VAC / 60Hz
Efficiency (at 115VAC Full Load) 80% typical at 115Vac full load
Fuse Internal and not user replaceable
Power Output <110 Watts (typ.)
< 64.5 Watts (Energy Star)
Max Input AC Current 1.5 Arms (max.)
Inrush Current (Cold Start) 80A Max./240Vac/50Hz
(Cold start 25℃at full load)
Power Supply Cold Start
Shall start and function properly when under full load, with
all combinations of input voltage, input frequency, and
operating temperature.
Power Supply Transient Immunity
Shall be able to withstand an ANSI/IEEE C62.41-1980
6000V 200 ampere ring wave transient test with no
damage.
Power Supply Line Surge Immunity
Shall be able to withstand ±1KV (L-L) and ±2KV (L-PE)
(Refer to EN55024:1998 / CISPR24.1997 / IEC1000-4-5:
1995 / EN61000-4-5: 1995)
Power Supply Missing Cycle Immunity
Shall be able to function properly, without reset or visible
screen artifacts, when ½ cycle of AC power is randomly
missing at nominal input.
Power Supply Acoustics
The power supply shall not produce audible noise that
would be detectable by the user. Audible shall defined to
be in compliance with ISO 7779 (DIN EN27779:1991)
Noise measurements of machines acoustics. Power
Switch noise shall not be considered.
Power Saving Operation(Method) VESA DPMS Signaling
Power Consumption
Mode LED Power Consumption
On Blue
110 W (typ; No USB peripheral
plugged)
120 W (max; With full load USB
hub)
Active off Amber <2W
Off Off <1W
Recovery Time On Mode = N/A, Active Off < 3 sec

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ELECTRICAL REQUIREMENT
Horizontal / Vertical Frequency
Horizontal Frequency Analog = 24 – 92 kHz
Digital = 31 – 92 kHz
Vertical Refresh Rate 50 – 85 Hz
Maximum Pixel Clock Analog = 195 MHz
Digital = 165 MHz
Sync Polarity Independent of sync polarity
Timing Table
Analog
Item Timing
Separated
Composite
SOG
Digital - TMDS
Remark
640 x 350 @ 70 Hz, 31.5 KHz     DMT
640 x 400 @ 60 Hz, 31.5 KHz    
DMT
For SOG sync, switch 640x400@60Hz and
640x480@60Hz by [1]+[2] short cut key (primary =
640x480@60Hz)
640 x 400 @ 70 Hz, 31.5 KHz    
DMT
For Separate, Composite and SOG, the image vertical
size image will be not full screen (Still at the center),
And the OSD will be 640x400/720x400 (promary=
640x400).
640 x 480 @ 50 Hz, 24.7 KHz    CVT
640 x 480 @ 60 Hz, 31.5 KHz    
DMT
For SOG sync, switch 640x400@60Hz and
640x480@60Hz by [1]+[2] short cut key (primary =
640x480@60Hz)
640 x 480 @ 67 Hz, 35 KHz     For MAC
640 x 480 @ 72 Hz, 37.9 KHz     DMT
640 x 480 @ 75 Hz, 37.5 KHz     DMT
640 x 480 @ 85 Hz, 43.3 KHz     DMT
720 x 400 @ 70 Hz, 31.5 KHz    
DMT
For Separate, Composite and SOG, the image vertical
size image will be not full screen (Still at the center),
And the OSD will be 640x400/720x400 (promary=
640x400).
720 x 480 @ 60 Hz, 15.8 KHz 
1. DTV 480i
2. Cause of interlace signal, the image might be flicker.
720 x 480 @ 60 Hz, 31.5 KHz     DTV 480p

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720 x 576 @ 50 Hz, 15.8 KHz 
1. DTV 576i
2. Cause of interlace signal, the image might be flicker.
720 x 576 @ 50 Hz, 31.3 KHz     DTV 576p
800 x 600 @ 56 Hz, 35.2 KHz     DMT
800 x 600 @ 60 Hz, 37.9 KHz     DMT
800 x 600 @ 72 Hz, 48.1 KHz     DMT
800 x 600 @ 75 Hz, 46.9 KHz     DMT
800 x 600 @ 85 Hz, 53.7 KHz     DMT
832 x 624 @ 75 Hz, 49.7 KHz     MAC
1024 x 768 @ 50 Hz, 39.6 KHz     CVT
1024 x 768 @ 60 Hz, 48.4 KHz     DMT
1024 x 768 @ 70 Hz, 56.5 KHz     DMT
1024 x 768 @ 72 Hz, 58.1 KHz     DMT
1024 x 768 @ 75 Hz, 60 KHz     DMT
1024 x 768 @ 75 Hz, 60.2 KHz     For MAC
1024 x 768 @ 85 Hz, 68.7 KHz     DMT
1152 x 864 @ 75 Hz, 67.5 KHz     DMT
1152 x 870 @ 75 Hz, 68.7 KHz     For MAC
1152 x 900 @ 67 Hz, 62.5 KHz     For SUN
1280 x 720 @ 50 Hz, 37.5 KHz     DTV 720p
1280 x 720 @ 60 Hz, 45 KHz     DTV 720p
1280 x 768 @ 50 Hz, 39.6 KHz     CVT
1280 x 768 @ 60 Hz, 47.4 KHz     DMT;
1280 x 768 @ 60 Hz, 47.8 KHz    
DMT;
For Composite and SOG,
Switch 1280x768@60Hz and 1360x768@60Hz by
[1]+[2] short cut key (primary = 1280x768@60Hz)
1280 x 768 @ 75 Hz, 60.3 KHz     DMT;
1280 x 768 @ 85 Hz, 68.6 KHz     DMT;
1280 x 960 @ 50 Hz, 49.4 KHz     DMT
1280 x 960 @ 60 Hz, 60.0 KHz     DMT
1280 x 960 @ 75 Hz, 75.2 KHz     DMT
1280 x 960 @ 85 Hz, 86 KHz     DMT
1280 x
1024 @ 50 Hz, 52.7 KHz     DMT
1280 x
1024 @ 60 Hz, 64 KHz     DMT
1280 x
1024 @ 75 Hz, 80 KHz     DMT
1280 x
1024 @ 85 Hz, 91 KHz     DMT

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1360 x 768 @ 60 Hz, 47.7 KHz    
DMT;
For Composite and SOG,
Switch 1280x768@60Hz and 1360x768@60Hz by
[1]+[2] short cut key (primary = 1280x768@60Hz)
1440 x 900 @ 60 Hz 55.9 KHz     DMT
1440 x 900 @ 75 Hz 70.6 KHz     DMT
1400 x
1050 @60 Hz 65.3 KHz    
1. DMT
2. No scaling function
(always full screen)
1600 x
1200 @60 Hz 75.0 KHz    
1. DMT
2. No scaling function
(always full screen)
1680 x
1050 @60 Hz 64.7 KHz    
1. DMT
2. No scaling function
(always full screen)
1680 x
1050 @60 Hz 65.3 KHz    
1. DMT
2. No scaling function
(always full screen)
1920x1080 @ 50 Hz 28.1 KHz 
1. DTV 1080i
2. No scaling function
(always full screen)
3. Cause of interlace signal, the image might be flicker.
1920x1080 @ 50 Hz 56.25 KHz    
1. DTV 1080p
2. No scaling function
(always full screen)
1920x1080 @ 60 Hz 33.7 KHz 
1. DTV 1080i
2. No scaling function
(always full screen)
3. Cause of interlace signal, the image might be flicker.
1920x1080 @ 60 Hz 67.5 KHz    
1. DTV 1080p
2. No scaling function
(always full screen)
1920x1200 @ 60 Hz 74 KHz    
1. DMT
2. No scaling function
(always full screen)
1920x1200 @ 60 Hz 74.6 KHz   
1. DMT
2. No scaling function
(always full screen)
*1. Tolerance ≧±2KHz. (if no over lapping issue)
*2. Any timing not in the list, it should display as normal or show on “OUT OF RANGE” OSD message without
blanking.

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Primary Presets
1920x1200 @ 60Hz
User Presets
Number of User Presets (recognized timings) Available: 10 presets total in FIFO configuration
Changing Modes
● Maximum Mode Change Blank Time for image stability : 3 seconds (Max), excluding “Auto
Adjust”time
● It should recall factory setting when execute Auto Image Adjust function by following
conditions,
1. Memory recall under DOS mode (640 x 350, 720 x 400 & 640 x 400).
2. New timing mode detected under DOS mode (640 x 350, 720 x 400 & 640 x 400).
● The monitor needs to do “Auto Adjust” the first time a new mode is detected
(see section “0-Touch™ Function Actions”)
● While running Change Mode, Auto Adjust or Memory Recall, the image shall blank

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TFT LCD PANEL
1st Source Panel
Model number CPT CLAA260WU09
Type Active Matrix TFT, TN technology
Active Size 550.08 mm x 343.8 mm (25.5” Wide)
Pixel Arrangement RGB Vertical Stripe
Pixel Pitch 0.2865 mm
Glass Treatment Anti-Glare
# of Backlights 6 CCFL
Backlight Life 50000 (6mA) Hrs (Min)
Luminance (Center) –
CT = 6500K,
Contrast/ Brightness = Max
400 cd/m2 (Typ after 30 minute warm up)
300 cd/m2 (Min after 30 minute warm up)
Brightness Uniformity 75 % (Min)
Contrast Ratio DCR on (by scalar)
4000 (Typ)
3500 (Min)
DCR off
1000 :1 (Typ)
800 : 1 (Min)
Color Depth 16.7 million colors (RGB 6 bit + Hi FRC)
Color Space NTSC 100% (CIE1931)
NTSC 110% (CIE1976)
Horizontal Viewing Angle 160 degrees (Typ) / 140 degrees (Min) @ CR>10
Vertical Viewing Angle 160 degrees (Typ) / 140 degrees (Min) @ CR>10
Response Time
Test conditions,
10%-90% @ Ta=25°C
Digital input
Contrast =Default
Brightness = Default
User Color (R/G/B=100%)
On-Off (Raise + Fall)
5ms (typ) / 8ms (max)
GTG (OD by scalar; base on)
3ms (Avg)
5ms (max)
*GTG Test conditions
1. 64x64 matrix
2. Analog or Digital input
3. Brightness OSD = 100
4. Contrast OSD = 100
5. Color = User Color (R/G/B = 100)
Mercury <5 mg per lamp
Panel Defects Please see Panel Quality Specifications.
*The average of measured value from monthly shipment shall be equal or better than the Typical value above.

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EDID data
VP2650wb_Analog.ddc
00 FF FF FF FF FF FF 00
5A 63 20 EB 01 01 01 01
01 12 01 03 0E 37 22 78
2E 70 25 AB 51 36 B3 24
10 50 54 BF EF 80 B3 00
A9 40 90 40 81 80 81 40
31 59 01 01 01 01 28 3C
80 A0 70 B0 23 40 30 20
36 00 26 58 21 00 00 1A
00 00 00 FF 00 51 56 30
30 38 30 31 30 30 30 30
31 0A 00 00 00 FD 00 32
55 18 5C 14 00 0A 20 20
20 20 20 20 00 00 00 FC
00 56 50 32 36 35 30 77
62 0A 20 20 20 20 00 52
VP2650wb_DVI.ddc
00 FF FF FF FF FF FF 00
5A 63 20 EB 01 01 01 01
01 12 01 03 80 37 22 78
2E 70 25 AB 51 36 B3 24
10 50 54 BF EF 80 31 0A
B3 00 A9 40 90 40 81 80
81 40 71 4F 31 59 28 3C
80 A0 70 B0 23 40 30 20
36 00 26 58 21 00 00 1A
00 00 00 FF 00 51 56 30
30 38 30 31 30 30 30 30
31 0A 00 00 00 FD 00 32
55 1F 5C 11 00 0A 20 20
20 20 20 20 00 00 00 FC
00 56 50 32 36 35 30 77
62 0A 20 20 20 20 00 E5

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3. Front Panel Function Control Description
Adjusting the Screen Image
Main Menu
with OSD controls
Front Control Panel
shown below in detail
Scrolls through
menu options and
adjusts the
displayed control.
Also a shortcut to
display the
Contrast
adjustment control
screen.
Displays the control screen
for the highlighted control.
Also toggles between two
controls on some screens.
Also a shortcut to toggle
analog and digital
connection.
Power light
Blue = ON
Orange = Power Saving
Standby Power
On/Off
Displays the
Main Menu or
exits the
control screen
and saves
adjustments.

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Do the following to adjust the display setting:
1. To display the Main Menu, press button [1].
NOTE: All OSD menus and adjustment screens disappear automatically after about 15
seconds. This is adjustable through the OSD timeout setting in the setup menu.
2. To select a control to adjust, pressSorTto scroll up or down in the Main Menu.
3. After the desired control is selected, press button [2]. A control screen like the one shown
below appears.
4. To adjust the control, press the up Sor down Tbuttons.
5. To save the adjustments and exit the menu, press button [1] twice.
The following tips may help you optimize your display:
• Adjust the computer's graphics card so that it outputs a 1920 x 1200 @ 60Hz video signal to
the LCD display. (Look for instructions on “changing the refresh rate” in the graphics card's
user guide.)
• 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.)
The line at the bottom of the screen shows
the current functions of buttons 1 and 2:
Exit or select the Brightness control.

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Main Menu Controls
Adjust the menu items shown below by using the up Sand down Tbuttons.
Control Explanation
Auto Image Adjust automatically sizes, centers, and fine tunes the video signal
to eliminate waviness and distortion. Press the [2] button to obtain a sharper
image.
NOTE: Auto Image Adjust works with most common video cards. If this
function does not work on your LCD display, then lower the video refresh rate
to 60 Hz and set the resolution to its pre-set value.
Contrast adjusts the difference between the image background (black level)
and the foreground (white level).
Brightness adjusts background black level of the screen image.
Input Select toggles between inputs if you have more than one computer
connected to the LCD Display.
Color Adjust provides several color adjustment modes, including preset color
temperatures and a User Color mode which allows independent adjustment of
red (R), green (G), and blue (B). The factory setting for this product is 6500K
(6500 Kelvin).
sRGB-This is quickly becoming the industry standard for color management,
with support being included in many of the latest applications. Enabling this
setting allows the LCD display to more accurately display colors the way they
were originally intended. Enabling the sRGB setting will cause the Contrast and
Brightness adjustments to be disabled.
9300K-Adds blue to the screen image for cooler white (used in most office
settings with fluorescent lighting).