Viewsonic VP2650WB Service Manual 1b

Service 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 - (800) 888-8583

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

1a 3/17/2008 Initial Release Jamie Chang

1b 5/28/2008 Revise hinge/base P/N and Add CJC RSPL 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.

Place the monitor on the lap, the panel surface

must be upwards.

Placing the monitor on foreign objects. That

could scratch the surface of the panel or cause

“Mura.”

The panel is placed facedown on the lap. That

may cause “Mura.”

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2. Specification

2.1 Product definition and specification

Product Name

Oracle P/N

Model Number

OSD Languages

TFT LCD Panel and Model #

Scalar

Input Signal

Sync Compatibility

ViewSonic VP2650Wb

VP2650WB

VP2650WB-EU

VP2650WB-CN

VS11997

English

French German Spanish

Italian

Finnish

Russian

Japanese

Korean

Traditional Chinese

Simplified Chinese

CPT CLAA260WU09

Genesis 5862H

Analog x1 / Digital x1

Separate Sync / Composite Sync / SOG

Adapter

Power Cable (Refer to APPENDIX B) Yes

15 pin mini D-SUB Analog Cable (1.8 m, black), with PC

2001 and Hot Plug Detect &DDC

(Detached cable; refer the Appendix A)

DVI-D Cable(1.8m, black) with PC 2001

(refer to Appendix A)

Audio Cable(1.8m, black) with PC 2001

MIC Cable(1.8m, black) with PC 2001

USB Cable (V2.0)

(1.8m, black) with PC 2001

English French

German Dutch

ViewSonic CD Wizard

Finnish Swedish

Italian Spanish

Internal Power Board

Yes

Greek Russian

Czech Hungarian

Turkish Polish

ViewSonic Quick Start Guide

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

Yes

(Refer to Segment 5.9.1)

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

Refer to Appendix A;

Video Cable Connector Pin out

Compliant DDC/2B and DDC/CI

Video RGB (Analog)

Video Signals

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

Compliant with version 1.3;

DDC/2B

The DDC communication shall not interrupt when power

off.

Compliant with Revision 1.1;

DDC/CI

The DDC communication shall not interrupt when power

off.

Digital link protection HDCP

Sync Compatibility Separate Sync / Composite Sync / SOG

Shall be compatible with all PC type computers,

Video Compatibility

Macintosh computers, and after market video cards

Resolution Compatibility Refer to Segment 4-5

Exclusions Not compatible with interlaced video

USB INTERFACE

Up stream:

USB B type female connector x1

Connector

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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Down stream

USB A type female connector x4

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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.)

80A Max./240Vac/50Hz

Inrush Current (Cold Start)

(Cold start 25℃ at full load)

Shall start and function properly when under full load, with

Power Supply Cold Start

all combinations of input voltage, input frequency, and

operating temperature.

Shall be able to withstand an ANSI/IEEE C62.41-1980

Power Supply Transient Immunity

6000V 200 ampere ring wave transient test with no

damage.

Shall be able to withstand ±1KV (L-L) and ±2KV (L-PE)

Power Supply Line Surge Immunity

(Refer to EN55024:1998 / CISPR24.1997 / IEC1000-4-5:

1995 / EN61000-4-5: 1995)

Shall be able to function properly, without reset or visible

Power Supply Missing Cycle Immunity

screen artifacts, when ½ cycle of AC power is randomly

missing at nominal input.

The power supply shall not produce audible noise that

would be detectable by the user. Audible shall defined to

Power Supply Acoustics

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

Mode LED Power Consumption

110 W (typ; No USB peripheral

plugged)

On Blue

Power Consumption

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

Digital - TMDS

SOG

DMT

For SOG sync, switch 640x400@60Hz and

640x480@60Hz by [1]+[2] short cut key (primary =

Item Timing

640 x 350 @ 70 Hz, 31.5 KHz

640 x 400 @ 60 Hz, 31.5 KHz

Analog

Composite

Separated

   

Remark

640 x 400 @ 70 Hz, 31.5 KHz

640 x 480 @ 50 Hz, 24.7 KHz

640 x 480 @ 60 Hz, 31.5 KHz

640 x 480 @ 67 Hz, 35 KHz

640 x 480 @ 72 Hz, 37.9 KHz

640 x 480 @ 75 Hz, 37.5 KHz

640 x 480 @ 85 Hz, 43.3 KHz

   

  

   

640x480@60Hz)

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).

CVT

DMT

For SOG sync, switch 640x400@60Hz and

640x480@60Hz by [1]+[2] short cut key (primary =

640x480@60Hz)

For MAC

DMT

720 x 400 @ 70 Hz, 31.5 KHz

720 x 480 @ 60 Hz, 15.8 KHz

720 x 480 @ 60 Hz, 31.5 KHz

   



   

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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).

1. DTV 480i

2. Cause of interlace signal, the image might be flicker.

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

800 x 600 @ 56 Hz, 35.2 KHz

800 x 600 @ 60 Hz, 37.9 KHz

800 x 600 @ 72 Hz, 48.1 KHz

800 x 600 @ 75 Hz, 46.9 KHz

800 x 600 @ 85 Hz, 53.7 KHz

832 x 624 @ 75 Hz, 49.7 KHz

1024 x 768 @ 50 Hz, 39.6 KHz

1024 x 768 @ 60 Hz, 48.4 KHz

1024 x 768 @ 70 Hz, 56.5 KHz

1024 x 768 @ 72 Hz, 58.1 KHz

1024 x 768 @ 75 Hz, 60 KHz

1024 x 768 @ 75 Hz, 60.2 KHz

1024 x 768 @ 85 Hz, 68.7 KHz

1152 x 864 @ 75 Hz, 67.5 KHz

1152 x 870 @ 75 Hz, 68.7 KHz

   

DTV 576p

DMT

MAC

CVT

DMT

For MAC

DMT

For MAC

1152 x 900 @ 67 Hz, 62.5 KHz

1280 x 720 @ 50 Hz, 37.5 KHz

1280 x 720 @ 60 Hz, 45 KHz

1280 x 768 @ 50 Hz, 39.6 KHz

1280 x 768 @ 60 Hz, 47.4 KHz

1280 x 768 @ 60 Hz, 47.8 KHz

1280 x 768 @ 75 Hz, 60.3 KHz

1280 x 768 @ 85 Hz, 68.6 KHz

1280 x 960 @ 50 Hz, 49.4 KHz

1280 x 960 @ 60 Hz, 60.0 KHz

1280 x 960 @ 75 Hz, 75.2 KHz

1280 x 960 @ 85 Hz, 86 KHz

1280 x

@ 50 Hz, 52.7 KHz

1024

   

For SUN

DTV 720p

CVT

DMT;

For Composite and SOG,

Switch 1280x768@60Hz and 1360x768@60Hz by

[1]+[2] short cut key (primary = 1280x768@60Hz)

DMT;

DMT

1280 x

@ 60 Hz, 64 KHz

   

1024

1280 x

@ 75 Hz, 80 KHz

   

1024

1280 x

@ 85 Hz, 91 KHz

   

1024

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DMT

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DMT;

1360 x 768 @ 60 Hz, 47.7 KHz

1440 x 900 @ 60 Hz 55.9 KHz 1440 x 900 @ 75 Hz 70.6 KHz

1400 x

@ 60 Hz 65.3 KHz

1050

1600 x

@ 60 Hz 75.0 KHz

1200

1680 x

@ 60 Hz 64.7 KHz

1050

1680 x

@ 60 Hz 65.3 KHz

1050

   

For Composite and SOG,

Switch 1280x768@60Hz and 1360x768@60Hz by

[1]+[2] short cut key (primary = 1280x768@60Hz)

DMT

1. DMT

2. No scaling function

(always full screen)

1. DMT

2. No scaling function

(always full screen)

1. DMT

2. No scaling function

(always full screen)

1. DMT

2. No scaling function

(always full screen)

1920x1080 @ 50 Hz 28.1 KHz

1920x1080 @ 50 Hz 56.25 KHz

1920x1080 @ 60 Hz 33.7 KHz

1920x1080 @ 60 Hz 67.5 KHz

1920x1200 @ 60 Hz 74 KHz



   



   

1. DTV 1080i

2. No scaling function

(always full screen)

3. Cause of interlace signal, the image might be flicker.

1. DTV 1080p

2. No scaling function

(always full screen)

1. DTV 1080i

2. No scaling function

(always full screen)

3. Cause of interlace signal, the image might be flicker.

1. DTV 1080p

2. No scaling function

(always full screen)

1. DMT

2. No scaling function

(always full screen)

1. DMT

1920x1200 @ 60 Hz 74.6 KHz

  

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

Brightness Uniformity 75 % (Min)

Contrast Ratio DCR on (by scalar)

Color Depth 16.7 million colors (RGB 6 bit + Hi FRC)

Color Space NTSC 100% (CIE1931)

Horizontal Viewing Angle 160 degrees (Typ) / 140 degrees (Min) @ CR>10

Vertical Viewing Angle 160 degrees (Typ) / 140 degrees (Min) @ CR>10

Response Time

400 cd/m2 (Typ after 30 minute warm up)

300 cd/m2 (Min after 30 minute warm up)

4000 (Typ)

3500 (Min)

DCR off

1000 :1 (Typ)

800 : 1 (Min)

NTSC 110% (CIE1976)

On-Off (Raise + Fall)

Test conditions,

10%-90% @ Ta=25°C

Digital input

Contrast =Default

Brightness = Default

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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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)

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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

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.

Displays the

Main Menu or

exits the

control screen

and saves

adjustments.

Power light Blue = ON Orange = Power Saving

Standby Power On/Off

Scrolls through menu options and adjusts the displayed control.

Also a shortcut to display the Contrast adjustment control screen.

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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.

The line at the bottom of the screen shows the current functions of buttons 1 and 2: Exit or select the Brightness control.

4. To adjust the control, press the up S or down T buttons.

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.)

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Main Menu Controls

Adjust the menu items shown below by using the up S and down T buttons.

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).

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Control Explanation

7500K-Adds blue to the screen image for cooler white (used in most office settings with fluorescent lighting).

6500K-Adds red to the screen image for warmer white and richer red.

5000K-Adds red to the screen image for warmer white and richer red.

User Color Individual adjustments for red (R), green (G), and blue (B).

1. To select color (R, G or B) press button [2].

2. To adjust selected color, pressSandT. 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.

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). NOTE: VESA 1920 x 1200 @ 60Hz (recommended) means that the resolution is 1920 x 1200 and the refresh rate is 60 Hertz.

Manual Image Adjust displays the Manual Image Adjust menu.

H./V. Position (Horizontal/Vertical Position) moves the screen image left or

right and up or down.

H. Size (Horizontal Size) adjusts the width of the screen image.

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Control Explanation

Fine Tune sharpens the focus by aligning text and/or graphics with pixel boundaries.

NOTE: Try Auto Image Adjust first.

Sharpness adjusts the clarity and focus of the screen image.

Dynamic Contrast allows the user to turn the contrast ratio enhancement on or

off.

Aspect ratio Selects the image size for 1:1, fill aspect ratio & full screen.

Display Mode provides two color space modes. The factory setting for this

product is PC mode.

PC mode sets color space to RGB for PC timing mode.

HD mode sets color space to YUV for HD timing mode.

Setup Menu displays the menu shown below:

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Control Explanation

Language Select allows the user to choose the language used in the menus and control screens.

Resolution Notice advises the optimal resolution to use.

OSD Position allows the user to move the OSD menus and control screens.

OSD Timeout sets the length of time the OSD screen is displayed. For

example, with a “15 second” setting, if a control is not pushed within 15 seconds, the display screen disappears.

OSD Background allows the user to turn the OSD background On or Off.

OSD Pivot is used to rotate the OSD menu, changing the OSD screen to

Landscape or Portrait mode.

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. Exception: This control does not affect changes made with the Language Select or Power Lock setting.

OSD and Power Lock Settings

• OSD Lock: Press and hold [1] and the up arrow S for 10 seconds. If any buttons are

pressed the message OSD Locked will display for 5 seconds.

• OSD Unlock: Press and hold [1] and the up arrow S again for 10 seconds.

• Power Button Lock: Press and hold [1] and the down arrow T for 10 seconds. If the

power button is pressed the message Power Button Locked will display for 5 seconds. With or without this setting, after a power failure, your LCD display’s power will automatically turn ON when power is restored.

• Power Button Unlock: Press and hold [1] and the down arrow T again for 10 seconds.

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4. Circuit Description

I. Introduction:

The VP2650wb is a 25.5" (1920x1200) TFT LCD monitor. It’s a dual interface (include

analog and digital) and support USB function ( 4 port) and OSD Pivot function and support

over-driver function LCD monitor and it’s compliant with VESA specification to offer a smart

power management and power saving function.

It also offers OSD menu for users to control the adjustable items and get some information

about this monitor. The VP2650wb also offers DDC/CI function to meet VESA standard and DVI

with HDCP function.

II. Circuit Implementations:

A.) THE MAIN BODY:

A-1.) Interface board block diagram:

SDRAM

Digital

OSD Pivot

DDC

Digital

Diff Data & Clock

(D)

Analog D-SUB

DSUB R,G, B HS, VS

Analog DDC

(a) Circuit operations:

In analog signal input to scaling IC, the operation theory is to convert the analog

GM5862H A/D&TMDS& Scaling& MCU

&OSD&HDCP

Flash Rom

EEPROM (HDCP)

USB BD.

CTRL BD.

To LCD MODULE DRIVING

Block

signals of Red, Green and Blue to the digital signals of Red, Green and Blue. The scaling

IC has the internal A/D converter that converts analog signals to digital data.

The scaling IC has OSD and auto detecting input timing functions. OSD offers adjustable

functions to the end-users. Auto detecting timing function can detect change modes. It

outputs the digital R-G-B data, pixel clock and control signal to TCON of the LCD module. A

MCU, build in scaling IC (Genesis GM5862H-LF), is responsible for the system processing.

There are two external storing units, one is 24C16 to store the OSD function data and user

preset timings and HDCP key content, the other one is flash ROM (25LV040) to store the

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firmware code.

Others, the scalar IC has a I/O port to detect Pivot device whether its level change, once

I/O port level change, the scalar will auto make OSD Menu window disappear.

Moreover, when input timing VS over 75Hz, the scalar will along with external SDRAM

memory to do FRC function, and make image can work normally.

(b) IC introduction:

1.) Genesis GM5862H-LF SCALER IC:

Genesis GM5862H with analog (RGB), DVI and HDCP function, and support

resolution up to WUXGA. The gm5862H leverages Genesis patented advanced

image-processing technology, as well as a proven integrated ADC/PLL and an

Ultra-Reliable DVI® compliant digital receiver to deliver a high-quality solution for

mainstream dual input monitors. The gm5862H also includes an ITU656 video input port

with color space converter that makes it an attractive solution for low cost MFM and TV

applications. The output section contains a 24-bit TTL output interface and a dual

channel LVDS transmitter for direct interfacing of commercially available LVDS LCD

panel modules. In addition, GM5862H includes an integrated X86 OCM with SPI

compatible interface, advanced color control features, a multicolor proportional font OSD

engine, and a number of system I/O components.

2.) EEPROM: Use 24C16 EEPROM to store monitor user data and user preset timings and

HDCP key. There are 10 user timing modes are automatically saved in it. Each timing

mode is allocated with 22 bytes of memory space for information such as Sync

frequencies, polarities… etc. PC can access the EEPROM data indirectly through the

SDA and SCL channels of DVI and D-sub (IIC communication). The digital and analog

DDC data are stored in two 24C02s EEPROM.

3.) Flash:

Use 25LV040 flash rom to save firmware program in order that the scalar IC

GM5862H

can access code from it and deal with it by CPU engine within the scalar.

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A-2.) Power board diagram:

The power board have two function blocks , one is power factor correction ( PFC ), the other

one is PWM to get DC output .

A-3.) PFC circuit introduction :

IC651( L6562) is a preregulator for power factor correction . The function and circuit is similar

to step-up stage.

It can boost low AC input voltage to bulk capacitor to get higher power factor.

Pin 1. is the inverting input of the error amplifier. R671,R672,R673,R674 are resistive divider

and are connected brtween the output regulated voltage and this point , to provide voltage

feedback.

Pin 2. is the output of amplifier. A feedback compensation network is placed between this pin

and the Pin 1.

Pin 3. is the input of the multiplier stage. R657,R658,R659 are resistive divider and are

connected to this pin the rectified mains . A voltage signal , proportional to the rectifed mains ,

appears on this pin .

Pin 4. is the input to the comparator of the control loop . The current is sensed by resistor

R670 and the resulting voltage is applied to this pin .

Pin 5. is the zero current detection input . If it is connected to GND , the device will be

disabled.

Pin 6. is the current return for driver and control circuits .

Pin 7. is the gate driver output . A push pull output stage is able to drive the power MOS .

Pin 8. is supply voltage of driver and control circuits.

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R657 1M F

R658 1M F

R660 1M F

R661 1M F

R662 511K F

A10

IC651

VCC

MULT

R659

C621

20K F

0.01U K

C620 1U K

A8 A9

C622

1U 100V

<Spec>

L6562N

1 2

2.2U K

COMP

GND

C623

2.2U K

10V

C624

10V

L6562N

ZD652

TZMC 24

ZCD

INV

C625

0.1U K

R664

3.01K F

D651

A K

1N5406

T651 390U

7 9

R667 68K

R668 30

D655 LL4148

R655 10K

C628 1U

R669 1K J

C626 470P K

R663 205K F

D652

A K

YG971S6R

Q651 2SK3502

R670

0.22

R666

22.6K F

R665 47

Q653 2N7002K-T1-E3

A-4.) PWM circuit introduction :

IC601 ( NCP1203) is the PWM control IC to get stable DC output. It can transfer high DC

c605 150U 450V M

<Spec>

B+

R671 499K F

R672 232K F

R673 232K F

R674

8.25K F

voltage at primary to low DC voltage at secondary .

Pin 1. lets user adjutst the lavel at which the cycle skipping process takes place . Shorting this

pin to ground , permanently disables the skip cycle feature.

Pin 2. is connected to optocoupler , the peak current setpoint is adjusted accordingly to the

output power demand .

Pin 3. senses the primary current and routes it to the internal comparator .

Pin 4. is the IC ground .

Pin 5. is the driver’s output pin to an external MOSFET .

Pin 6. is Vcc pin and connected to an external bulk capacitor .

Pin 7. is empty and ensures adequate creepage distance .

Pin 8. is connected to the high-voltage rail , this pin injects a constant current into the Vcc bulk

capacitor .

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+ 62 hidden pages

Viewsonic VP2650WB Service Manual 1b

Specifications and Main Features

Frequently Asked Questions

User Manual

1. Precautions and Safety Notices Precautions:

2. Specification

3. Front Panel Function Control Description

4. Circuit Description