ViewSonic VX2025wm-1 User Manual

Service Manual

ViewSonic VX2025wm-1

Model No. VS10859

20” Color TFT LCD Display

(VX2025wm-1_SM Rev. 1b Sep. 2006)

ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA – (800) 888-8583

Copyright © 2005 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.

Revision History

Revision SM Editing Date ECR Number Description of Changes Editor

1a 02/16/2006 Initial Release Jamie Chang

1b 09/11/2006 VS-E060132 Add 2nd panel source Jamie Chang

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TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 4

3. Front Panel Function Control Description 9

4. Circuit Description 12

5. Adjustment Procedure 24

6. Troubleshooting Flow Chart 38

7. Recommended Spare Parts List 41

8. Exploded Diagram and Exploded Parts List 44

9. Block Diagram 48

10. Schematic Diagrams 49

11. PCB Layout Diagrams 56

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1. Precautions and Safety Notices

1. Caution : No modification of any circuit should be attempted . Service work should only be performed after you are thoroughly familiar with all of the following safety checks and servicing guide line

2. Safety Check : Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit. These voltage are exposed in such areas as the associated transformer circuits .

3. POWER SUPPLY REQUIREMENTS The external power converter for this display utilizes AC and DC cords , AC cord is detachable , but DC cord is permanently attached . Any attempt to replace another adapter could result in serious problem on the display .

4. LEAKAGE CURRENT HOT CHECK 4-1 Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during

this check.

4-2 Connect a 1500 ohm , 10 watt resistor , paralleled by a 0.15uF capacitor between each

metallic part and a good earth ground

4-3 Use an AC voltmeter with 1000 ohm / volt or more sensitivity and measure the AC voltage

across the combination 1500 ohm resistor and 0.15uF capacitor. 4-4 Move the resistor connection to each exposed metallic part and measure the voltage. 4-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement. 4-6 Voltage measured must not exceed 1.5 volt RMS, from any exposed metallic part to the

ground. A leakage current tester may be used in the above hot check, in which case any

circuit measured must not exceed 1.0 milliamp. In the case of a measurement exceeding

the 1.0 milliamp value, a rework is required to eliminate the chance of a shock hazard .

AC VOLTMETER

0.15u .

To Metal Parts

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1500 10W

Earth Ground

Handing Methods

correct method

Take out the monitor with cushion

Place the monitor on a clean & soft foam pad

incorrect method

Take out the monitor by grasping the LCD

panel.That may cause “ MURA“.

Place the monitor on foreign objects .That

could scratch the surface of panel

Do not touch the surface of the polarizer .

Surface of the panel is pressed by fingers &

this may cause “ MURA “

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bezel

bracket

when you get the lcd

monitor

when assemble&disassembly

when you get the lcd

when assemble&disassembly

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2. Specification

GENERAL specification

Test Resolution & Frequency 1680x1050 @ 60Hz Test Image Size Full Size

Contrast and Brightness Controls

VIDEO INTERFACE

Analog Input Connector DB-15 (Analog), refer the appendix A Digital Input Connector DVI-D (Digital), refer the appendix B 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 DB-15 Pin out Compliant DDC 1/2B

Video Signals 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 LVDS DDC 1/2B Compliant with Revision 1.3 Sync Compatibility Separate Sync, Composite Sync, SOG

Video Compatibility

Resolution Compatibility

Exclusions Not compatible with interlaced video

Factory Default: Contrast = 70%, Brightness = 100%

1. Video RGB (Analog) Separate, Composite, and Sync on Green

2. TMDS (Digital)

Shall be compatible with all PC type computers, Macintosh computers, and after market video cards 640 x 350*, 640 x 480, 720 x 400* (640 x 400*), 800 x 600, 832 x 624, 1024 x 768, 1152 x 864, 1152 x 870, 1280 x 720, 1280 x 960, 1280 x 1024, 1680 x 1050 * The image vertical size might not be full screen. But the image vertical position should be at the center.

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POWER SUPPLY

Internal Power Supply Part Number: EAPD-64CF Input Voltage Range 90 TO 264 VAC Input Frequency Range 47.5 TO 63 HERTZ Short Circuit Protection Output can be shorted without damage Over Current Protection 10 A typical Leakage Current 3.5mA (Max) at 264VAC / 50Hz EFFICIENCY 80 % typical at 115VAC Full Load Fuse Internal and not user replaceable Power Dissipation 64 Watts (typ) Max Input AC Current 1.5Arms @ 90VAC INRUSH CURRENT (COLD START) 80 A @ 230VAC

Shall start and function properly when under full load, with all

Power Supply Cold Start

Power Supply Transient Immunity Power Supply Line Surge Immunity

Power Supply Missing Cycle Immunity

Power Supply Acoustics

US Type Power Cable

European Type Power Cable

CCC Type Power Cable

PSE Type Power Cable

Power Saving Operation(Method) Power Consumption

Recovery Time On Mode = N/A, Active Off < 3 sec

combinations of input voltage, input frequency, and operating temperature Shall be able to withstand an ANSI/IEEE C62.41-1980 2000V 200 ampere ring wave transient test with no damage Shall be able to withstand 1.5 times nominal line voltage for one cycle with no damage Shall be able to function properly, without reset or visible 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 define to be in compliance with ISO 7779 (DIN EN27779:1991) Noise measurements of machines acoustics. Power Switch noise shall not be considered Separate 3-prong NEMA 5-15P type plug. Length = 1.8m. Connects to display. Color = Black Schuko CEE7-7 type plug. Length = 1.8m, Connects to display. Color = Black Separate 3-prong type plug. Length = 1.8m. Connects to display. Color = Black Separate 2-prong NEMA 1-15P type plug. Length = 1.8m. Connects to display. Color = Black VESA DPMS Signaling ON Mode < 50W (Max) / 49W (Typ) On Mode < 50 W (Max) / 49W (Typ) Saving Mode < 2 W, Off Mode < 1 W

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ELECTRICAL REQUIREMENT

Horizontal / Vertical Frequency

Horizontal Frequency 30 – 82 KHZ Vertical Refresh Rate 50 – 75 HZ Maximum Pixel Clock Digital: 165 MHz Analog: 205 MHz Sync Polarity Independent of sync polarity.

Timing Table

Item Timing Analog Digital

1 640 x 350 @ 70Hz, 31.5kHz Yes Yes 2 640 x 400 @ 60Hz, 31.5kHz Yes Yes 3 640 x 400 @ 70Hz, 31.5kHz Yes Yes 4 640 x 480 @ 50Hz, 24.7kHz No No 5 640 x 480 @ 60Hz, 31.5kHz Yes Yes 6 640 x 480 @ 67Hz, 35.0kHz Yes Yes 7 640 x 480 @ 72Hz, 37.9kHz Yes Yes 8 640 x 480 @ 75Hz, 37.5kHz Yes Yes

9 640 x 480 @ 85Hz, 43.27kHz No No 10 720 x 400 @ 70Hz, 31.5kHz Yes Yes 11 800 x 600 @ 56Hz, 35.1kHz Yes Yes 12 800 x 600 @ 60Hz, 37.9kHz Yes Yes 13 800 x 600 @ 75Hz, 46.9kHz Yes Yes 14 800 x 600 @ 72Hz, 48.1kHz Yes Yes 15 800 x 600 @ 85Hz, 53.7kHz No No 16 832 x 624 @ 75Hz, 49.7kHz Yes Yes 17 1024 x 768 @ 60Hz, 48.4kHz Yes Yes 18 1024 x 768 @ 70Hz, 56.5kHz Yes Yes 19 1024 x 768 @ 72Hz, 58.1kHz Yes Yes 20 1024 x 768 @ 75Hz, 60.0kHz Yes Yes 21 1024 x 768 @ 85Hz, 68.67kHz No No 22 1152 x 864 @ 75Hz, 67.5kHz Yes Yes 23 1152 x 870 @ 75Hz, 68.7kHz Yes Yes 24 1280 x 1024 @ 60Hz, 63.4kHz Yes Yes 25 1280 x 1024 @ 75Hz, 79.97kHz Yes Yes 26 1280x 720 @ 60Hz, 45kHz Yes Yes 27 1680 x 1050 @ 60Hz, 65.3kHz Yes Yes 28 1680 x 1050 @ 75Hz, 82.3kHz Yes No 29 1680 x 1050 @ 85Hz, 93.9kHz No No

Primary Presets

1680x1050 @ 60Hz

AUDIO INTERFACE (SPEAKER SPECIFICATION)

Line input connection 3.5 mm stereo jack Line input signal 1.3 Vrms Line input impedance 10 kOhm Maximum power output (Electric) 1 W @ < 5% distortion Signal to Noise Ratio 72 dB Frequency response 200 Hz – 20 Khz Distortion

Vibration Screen image

Connector PC99 requirement Audio in Lime Green pantone # 577C Cable type / length 3.5mm stereo cable / 1.8m length

Audio DPMS

< 5 % THD (@1kHz) There should be no audible vibration with volume at 100% and treble / bass at default There should be no affect on the screen image stability under any conditions

Speakers stay on when the rest of the monitor is in power saving Note: There is no guarantee <1 W power consumption in Active Off mode, when the Audio Cable is connected

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Panel Characteristics:

Source Panel

Model number AUO M201EW01 V0 Type PMVA type with LVDS interface Active Size 433.44 (H) x 270.9(V) Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.258 mm GLASS TREATMENT Anti Glare (Hard coating 3H) # OF BACKLIGHTS 6 CCFL BACKLIGHT LIFE 50,000 Hours (Min) Luminance (5-point) – Condition: CT = 6500K, Contrast = Max, Brightness = Max Brightness Uniformity ≧80% (Typ), 75% (Min), Contrast Ratio 800:1 (typ), 400:1 (min) Color Depth 16.7 million colors (8 bits) Viewing Angle (Horizontal) @ CR>10

Viewing Angle (Vertical) @ CR>10

Response Time 10%-90% @ Ta=25°C

Panel Defects Please see Panel Quality Specifications.

300 cd/m2 (Typ after 30 minute warm up) 240 cd/m2 (Min after 30 minute warm up)

Typical: 176º Minimum: 150º @ CR>5 Typical: T.B.D Minimum: T.B.D

Tr = 25 ms,Tf = 15 ms Total = 40ms (max) Tr =11 ms,Tf = 5ms Total =16ms(typ) Without OD Board (gray –gray) (Average of Tr and Tf) = 8 ms (typ)

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2nd Source Panel

Model number AUO M201EW01 V3 Type AMVA type with LVDS interface Active Size 433.44 (H) x 270.9(V) Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.258 mm GLASS TREATMENT Anti Glare (Hard coating 3H) # OF BACKLIGHTS 6 CCFL BACKLIGHT LIFE 40,000 Hours (Min) Luminance (5-point) – Condition: CT = 6500K, Contrast = Max, Brightness = Max Brightness Uniformity ≧80% (Typ), 75% (Min), Contrast Ratio 1000:1 (typ), 750:1 (min) Color Depth 16.7 million colors (8 bits) Viewing Angle (Horizontal) @ CR>10

Viewing Angle (Vertical) @ CR>10

Response Time 10%-90% @ Ta=25°C

Panel Defects Please see Panel Quality Specifications.

300 cd/m2 (Typ after 30 minute warm up) 240 cd/m2 (Min after 30 minute warm up)

Typical: 178º Minimum: 150º @ CR>5 Typical: T.B.D Minimum: T.B.D

Typical: 178º Minimum: 150º @ CR>5 Typical: T.B.D Minimum: T.B.D Tr = 25 ms,Tf = 15 ms Total = 40ms (max) Tr =11 ms,Tf = 5ms Total =16ms(typ) Without OD Board (gray –gray) (Average of Tr and Tf) = 8 ms (typ)

MECHANICAL

Dimension (Desktop)

Width 484.6 mm (19 inch) Height 441.3 mm (17.3inch) Depth 201 mm (7.9 inch) Monitor Weight 6.3 Kg (13.89 lbs)

Dimension (Head Only / Wall Mount) Width 484.6 mm (19 inch) Height 340.1 mm (13.4 inch) Depth 67.1 mm (2.6 inch) Monitor Weight 5 Kg (11.02 lbs)

Ergonomics

Tilt Up From 0º up to 20º≧ Tilt Down From 0º down to -3º ~ -5 º

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3. Front Panel Function Control Description

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Main Menu Controls

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

A. 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.

B. Contrast adjusts the difference between the image background (black level) and the foreground

(white level). C. Brightness adjusts the lamps current to control the screen brightness. D. Input adjusts the Analogue or the Digital input source E. Audio Adjust the volume increase or decrease and mute function F. Color Adjust provides several color options: preset color temperatures and Custom User Color which

allows you to adjust red (R), green (G), and blue (B). The factory setting for this product is 6500K

(6500° Kelvin). 9300K — Adds blue to the screen image for cooler white (used in most office settings with fluorescent lighting). 5400K — Adds red to the screen image for warmer white and richer red. Custom User Color — Individual adjustments for red, green, and blue. 1 To select color (R, G or B) press button [2]. 2 To adjust selected color, press ▲ or ▼ . 3 When you are finished making all color adjustments, press button [1] twice.

G. Information displays the timing mode (video signal input) coming from the graphics card in your

computer. See your graphic card’s user guide for instructions on changing the resolution and refresh

rate (vertical frequency). VESA 1680 x 1050 @ 60 Hz (recommended) means that the resolution is

1680 x 1050 and the refresh rate is 60 Hertz. H. Manual Image Adjust controls are explained below: H. Size (Horizontal Size) adjusts the width of the screen image. NOTE: Vertical size is automatic with your LCD display. H./V. Position adjusts horizontal and vertical position of the screen image. You can toggle between Horizontal and Vertical by pressing button [2]. Horizontal moves the screen image to the left or to the right. Vertical moves the screen image up and down. Fine Tune sharpens focus by aligning the illuminated text and/or graphic characters. Sharpness adjusts the clarity and focus of the screen image. Setup Menu controls are explained below: Language allows you to choose the language used in the menus and control screens. Resolution Notice displays the recommended resolution for this LCD display. Enable allows the Resolution Notice to appear on-screen.

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Disable will not allow the Resolution Notice to appear on-screen. OSD Timeout sets the length of time an on-screen display screen is displayed. For example, with a“15 second” setting, if a control is not pushed within 15 seconds, the display OSD disappears. I. OSD Position allows you to move the on-screen display menus and control screens. J. Memory Recall returns adjustments to the original factory settings if the display is operating in a

factory Preset Timing Mode listed in this user guide.

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4. Circuit Description

1. Outline

1.1 Power On/Off, (2) Enter button, up arrow button, down arrow button, (1) MENU button, n on the front panel.

1.2 D-sub 15pin connector, DVI-D connector, audio line-in receptacle, and AC-IN are located on the back side of the cabinet.

1.3 OSD menu includes the following function;

Auto Image Adjust (only active under analog input)

Contrast/Brightness

Input Select

Audio Adjust

Color Adjust

Information

Manual Image Adjust

Setup Menu

Memory Recall

1.4 Contrast and Brightness can be directly controlled with UP / DOWN key.

1.5 Audio volume can be controlled with UP/DN key when Audio Adjust menu is active.

2. CONNECTORS

2.1 AC inlet : CEE22 typed connector

2.2 Audio : Line-in,

CN9

1 5 4 3 2

Line-in receptacle (Line-in receptacle is green)

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2.3 Video signal connector for analog input: 15P Mini D-Sub

CN6

162738495

DB15HD

16 17

PIN MNEMONI SIGNAL

1 RV Red Video 2 GV Green Video 3 BV Blue Video 4 NC None 5 GND Ground (DDC return) 6 RG Red GND

7 GG Green GND 8 BG Blue GND

9 +5V +5V (for DDC) 10 SG Sync GND 11 NC None 12 SDA DDC Data 13 HS Horizontal Sync 14 VS Vertical Sync 15 SCL DDC Clock

2.4 Video signal connector for digital input: 24pin DVI-D connector

CN9

Pin No. Signal Name Description

RX2-

RX2+

GND

RX4-

RX4+

SCL

SDA

RX1-

RX1+

GND

RX3-

RX3+

GND

RX0-

RX0+

GND

RX5-

RX5+

GND

RXC+

RXC-

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

17 18 19 20 21 22 23 24

1 RX2- TMDS negative differential input, channel 2 2 RX2+ TMDS positive differential input, channel 2 3 GND Logic Ground 4 RX4- Reserved. No connection 5 RX4+ Reserved. No connection 6 SCL DDC2B Clock 7 SDA DDC2B Data 8 VS Reserved. No connection

9 RX1- TMDS negative differential input, channel 1 10 RX1+ TMDS positive differential input, channel 1 11 GND Logic Ground 12 RX3- Reserved. No connection 13 RX3+ Reserved. No connection 14 +5V Power 15 GND Logic Ground 16 HP SENSE Pin, Pull High 17 RX0- TMDS negative differential input, channel 0 18 RX0+ TMDS positive differential input, channel 0

DVI-D

19 GND Logic Ground 20 RX5- Reserved. No connection 21 RX5+ Reserved. No connection 22 GND Logic Ground 23 RXC+ TMDS positive differential input, reference clock 24 RXC- TMDS negative differential input, reference clock

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3. ELECTRICAL SPECIFICATIONS

3.1 Standard conditions

Display Area Video Signal Contrast Brightness Ambient Input Warming up Display

3.2 POWER

3.2.1 Power supply Input voltage 100~240Vac Power frequency 50~60Hz Input current

433.44 x 270.9 mm

0.7Vpp

Default

20 +/- 5 °C

> 30 min

1680 x 1050

<1.5Arms@90Vac

Inrush current

Power consumption 47W(typical);50Watts(Max)

3.2.2 Power Management

State Power Indicator On 47Watts Green

Standby < 2Watts Amber Off <2Watts Off

80A(Max) at 230Vac(cold start)

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3.3 Acceptable timing

If the timing is within following specification, this LCD display can automatically function with a certain position. Horizontal: Sync frequency: 30~82 KHz (Analog: 205MHz, Digital:165MHz) Vertical: Sync frequency: 50~75*Hz

3.4 Signal level and input impedance

3.4.1 Video Signal level: 0.7Vp-p Video signal.

3.4.2 Sync Signal level

H/V Separate: TTL level

3.4.3 Input impedance

Analog video input: 75 ohm Digital video input: 100 ohm Sync input: > 1 k ohm Audio input: 10K ohm

4. SIGNAL CABLE: Signal cable with Mini D-Sub 15P connectors at both ends. Length: 1.8 meter.

5. EDID data

5.1. Analog EDID: Analog EDID is stored in IC4 ______________________________________________________________________ EDID Block 0, Bytes 0-127 128 BYTES OF EDID CODE: 0 1 2 3 4 5 6 7 8 9 ________________________________________ 0 | 00 FF FF FF FF FF FF 00 5A 63 10 | 1D E5 01 01 01 01 01 0F 01 03 20 | 0E 2B 1B 78 2E CF E5 A3 5A 49 30 | A0 24 13 50 54 BF EF 80 B3 0F 40 | 81 80 81 40 71 4F 01 01 01 01 50 | 01 01 01 01 21 39 90 30 62 1A 60 | 27 40 68 B0 36 00 B1 0F 11 00 70 | 00 1C 00 00 00 FF 00 51 36 59 80 | 30 35 30 31 30 30 30 30 31 0A 90 | 00 00 00 FD 00 32 4B 1E 52 15 100 | 00 0A 20 20 20 20 20 20 00 00 110 | 00 FC 00 56 58 32 30 32 35 77 120 | 0A 20 20 20 20 20 00 11 ______________________________________________________________________ (08-09) ID Manufacturer Name ________________ = VSC (11-10) Product ID Code _____________________ = E51D (12-15) Last 5 Digits of Serial Number ______ = Not Used

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(16) Week of Manufacture _________________ = 01 (17) Year of Manufacture _________________ = 2005 (10-17) Complete Serial Number ______________ = See Descriptor Block (18) EDID Version Number _________________ = 1 (19) EDID Revision Number ________________ = 3 (20) VIDEO INPUT DEFINITION: Analog Signal

0.700, 0.300 (1.000 Vp-p) Separate Syncs, Composite Sync, Sync on Green (21) Maximum Horizontal Image Size ________________ = 430 mm (22) Maximum Vertical Image Size __________________ = 270 mm (23) Display Gamma ________________________________ = 2.20 (24) Power Management and Supported Feature(s): Active Off/Very Low Power, Standard Default Color Space, Preferred Timing Mode Display Type = R/G/B Color (25-34) CHROMA INFO: Red X - 0.640 Green X - 0.288 Blue X - 0.144 White X - 0.313 Red Y - 0.352 Green Y - 0.628 Blue Y - 0.076 White Y - 0.329 (35) ESTABLISHED TIMING I: 720 X 400 @ 70Hz (IBM,VGA) 640 X 480 @ 60Hz (IBM,VGA) 640 X 480 @ 67Hz (Apple,Mac II) 640 X 480 @ 72Hz (VESA) 640 X 480 @ 75Hz (VESA) 800 X 600 @ 56Hz (VESA) 800 X 600 @ 60Hz (VESA) (36) ESTABLISHED TIMING II: 800 X 600 @ 72Hz (VESA) 800 X 600 @ 75Hz (VESA) 832 X 624 @ 75Hz (Apple,Mac II) 1024 X 768 @ 60Hz (VESA) 1024 X 768 @ 70Hz (VESA) 1024 X 768 @ 75Hz (VESA) 1280 X 1024 @ 75Hz (VESA) (37) Manufacturer's Reserved Timing: 1152 X 870 @ 75Hz (Apple,Mac II) (38-53) Standard Timing Identification: 1680 X 1050 @75Hz 1280 X 1024 @60Hz

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