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LCD Color Monitor: T20BNUW-G1
Model Name: ACER AL2002W-Dual

Service Manual
Table of Contents
Important Safety Notice -------------------------------------------------------------------------------------01
01. Product Overview---------------------------------------------------------------------------------------02
02. General Requirement----------------------------------------------------------------------------------02
03. Electrica Related Information------------------------------------------------------------------------ 03
04. Flat Panel------------------------------------------------------------------------------------------------ 12
05. Optical Characteristics-------------------------------------------------------------------------------- 14
06. Environmental Requirements------------------------------------------------------------------------ 16
07. RGB settings---------------------------------------------------------------------------------------------17
08. Color grayscale linearity-------------------------------------------------------------------------------17
09. Packing Drawing----------------------------------------------------------------------------------------18
10. Exploded Diagram--------------------------------------------------------------------------------------19
11. Schematics and Layouts-------------------------------------------------------------------------------20
Appendix-1 Product Matrix
Appendix-2 User s Manual
Appendix-3 Quick Start Guide
Appendix-4 Spare Parts List
ACER AL2002W 1

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Important Safety Notice

Product Anouncement:

This product is certificated to meet RoHS Directive and Lead-Free produced definition. Using approved critical components only is

recommended when the situation to replace defective parts. Vender assumes no liability express or implied, arising out of any

unauthorized modification of design or replacing non-RoHS parts. Service providers assume all liability.

Qualified Repairability:

Proper service and repair is important to the safe, reliable operation of all series products. The service

providers recommended by vender should being aware of notices listed in this service manual in order to

minimize the risk of personal injury when perform service procedures. Furtermore, the possibile existed

improper repairing method may damage equipment or products. It is recommended that service engineers

should have repairing knowledge, experience, as well as appropriate product training per new model before

performing the service procedures.


To avoid electrical shocks, the products should be connect to an authorized power cord, and turn off the master power

switch each time before removing theAC power cord.

To prevent the product away from water or explosed in extremely high humility environment.

To ensure the continued reliability of this product, use only original manufacturer's specified parts.

To ensure following safty repairing behavior, put the replaced part on the components side of PWBA, not solder side.

To ensure using a proper screwdriver, follow the torque/force listed in assembly and disassembly

procedures to unscrew screws.

Using Lead-Free solder to well mounted the parts.

The fusion point of Lead-Free solder requested in the degree of 220C.

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1. Product Overview:

This document defines the design and performance requirements for the Liteon standard 20" wide flat panel monitor. The

display element shall be a 20" inch diagonal, WSXGA (1680 x 1050) resolution, TFT-LCD (Thin Film Transistor Liquid Crystal

Display. Video input signals are Analog D-sub and DVI-D Digital with non-interlaced signaling. Power saving function

complies with the DPMS (Display Power Management Standard).

General display parameters
Display Area 20" diagonal, (H)433.44(H)x270.90(V)
Resolution 1680 x 1050 pixels
Display Color Number 16.7M colors(RGB 6-bit+Hi-FRC data)
Display Type a-Si TFT active-matrix
Contrast Ratio 800 : 1 typ.
Brightness 300cd/m2 typ.
Response Time (Ton + Toff) 5 ms typ.
Pixel Pitch 0.258mm x 0.258mm RGB Vertical Stripes
Vertical Viewing 160 degrees typ,
Horizontal Viewing 160 degrees typ,

Optical Characteristics

M201EW02 V1

Note: Per panel specification, over the life of the product, variation of parameters specified in panel
specification shall be maintained within reasonable limits. Check supplier quality inspection criteria for
the detail information.

2.1 Test Condition

Brightness level at max & contrast level at default full white pattern test mode following spec. Warm up more than 30

min, ambient light < 1 Lux, Luminance meter CA210 or BM7 or compatible equipment.

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2.2 Test Equipment

The reference signal source is a calibrated Chroma 2326 or Quantum 801GD video generator. The use of other signal

generators during qualification and production is acceptable provided the product complies with this specification.

This section describes the electrical requirement of the monitor. The block diagram in Figure 1 illustrates the various electrical


3.1. Product Block Diagram

The LCD monitor will contain an interface board, a Power / Inverter board, and a function key board. The interface block

will house the flat panel control logic, brightness control logic, and DC-DC conversion to supply the appropriate power to

the whole board and LCD panel, and transmitting LVDS signals into LCD Module to drive the LCD display circuit. The

inverter block will drive the four dual CCFLs (Cold Cathode fluorescent Tube). The power block will provide the DC power

to interface board and LCD panel. The function key block will provides the OSD control signal, power ON/OFF and LED

indicator to the interface board.

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3.2. Product Specification


H 30kHz ~ 81kHz
Frequency Ranges
V 56Hz ~ 76Hz

Max Pixel clock 205MHz

RGB Input Level 0.7Vp-p
Analog Signal Input
RGB Input Impedance 75

Separate SYNC, Composite Sync or Sync on Green are
Sync Input Signal

Sync Input Impedance 50

H 30kHz ~ 81kHz
Frequency Ranges
V 56Hz ~ 76Hz

Digital Signal Input Max Pixel clock 165MHz

DVI Input Level 150mVVp-p1560mV

DVI Input Impedance Input Impedance 100 per pair

AC power AC 100V ~ AC 220V 10% 50/60Hz, 3 pin AC power cord
Input connectors D-SUB 15 pin, DVI-D

AC IN 90~264V
Normal Operation 49W Max

Power Consumption
Standby, Suspend,
< 2W
Active Off

Power Off < 1W @ (90VAC~240VAC)

User's Control Front Panel Buttons POWER, MENU, SELECT, + , -

Dimming control range
35% typical
(max-min/max) x 100%

Pre-Defined Factory 11

Timing User 15

Plug and Play VESA DDC2B

Power Saving DPMS

Input Signal Counter tolerance H 1kHz, V 1 Hz

3.3. Interface Connectors

3.3.1. Power Connector and Cables

The AC inlet connector shall have an IEC/CEE-22 type male power receptacle for connection to mains power.

The power cord, exact type to be supplied in the appropriate Option Kit, shall be black have length of 1.8

0.05 meters.

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3.3.2. Signal Connectors and Cable

The analog signal cable shall be black and 1800 mini-meters, the digital signal cable shall be black and 1800

mini-meters, At the end of the analog cable shall be a molded-over, shielded, triple row, 15 position and blue

color D subminiature connector. At the end of the digital cable shall be a molded-over, shielded, triple row, 24

position, white color DVI-D connector. The CPU connection shall have captive screw locks, which will be

adequate for hand tightening. The monitor connection may use small screws.
3.3.3. Connector Pin Assignment

Pin Signal Pin Signal Pin Signal
1 Red-Video 6 Red-GND 11 GND
2 Green-Video 7 Green-GND 12 DDC-SDL
3 Blue-Video 8 Blue-GND 13 H-SYNC
4 GND 9 + 5V 14 V-SYNC
5 Self Test 10 DDC-GND 15 DDC-SCL

B. DVI-D (Digital TMDS) Connector
Pin Signal Pin Signal Pin Signal

1 TMDS Data 2- 9 TMDS Data 1- 17 TMDS Data 0-

2 TMDS Data 2+ 10 TMDS Data 1+ 18 TMDS Data 0+

3 TMDS Data GND 11 TMDS Data GND 19 TMDS Data GND

4 NC 12 NC 20 NC

5 NC 13 NC 21 NC

6 DDC Clock 14 + 5V Power 22 TMDS Clock GND

7 DDC Data 15 Self Test 23 TMDS Clock +

8 NC 16 Hot Plug Detect 24 TMDS Clock -

C. Power Board Connector
Pin Signal
1 5.2V
2 5.2V
3 5.2V
4 5.2V

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D. Flat Panel Connector

3.4. Input Signals (Analog RGB Signal Input):

3.4.1. Video Input Signal Ranges

No. Symbol Item Min Normal Max Unit Remark

1 Fh Horizontal Frequency 30 81 kHz Minimum range

2 Fv Vertical Frequency 56 76 Hz Minimum range

3 Fclk Locked Pixel Clock Frequency 165 MHz

4 Vih Hi Level Input 2.0 5.0 V Note 1)

5 Vil Low Level Input 0 0.8 V Note 1)

6 Video RGB Analog Video Level 0.0 0.735 V 75 to Ground

Note : 2.2k to Ground, Schmitt-Triggers Input, Supported 3.3V device H & V sync. Output.

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3.4.2. Video Signal Amplitudes

The three video inputs consist of Red, Green, and Blue signals, each with its own coaxial cable terminated at

the monitor. These video signals are analog levels, where 0V corresponds to black, and 735 mV is the

maximum signal amplitude for the respective color, when each signal is terminated by a nominal 75.0 ohm. For

a given monitor luminance levels are measured using this defined video amplitude driving a monitor meeting

the termination requirements. The signal amplitude is not to be readjusted to compensate for variations in

termination impedance.

3.4.3. Video Signal Termination Impedance

This analog video signal termination shall be 75 ohm +/- 2% which shall be resistive with a negligible reactive


3.4.4. Synchronization (Sync) Signals

The Horizontal Sync (HS) TTL signal is used to initiate the display of a horizontal line. HS may be either active

high or active low, depending upon the timing. The Vertical Sync (VS) TTL signal is used to initiate the display

of a new frame. VS may be either active high or active low, depending on the timing.

3.4.5. Sync Signal Levels

The monitor must accept sync signals from both 3.3 and 5 volt TTL logic families. The inputs shall sense a logic

0 when the input is 0.8 volt or less and shall sense a logic 1 when the input is 2.0 volts or greater. In addition to

these level requirements, there shall also be a minimum of 0.3 volt hysteresis provided for noise immunity

(typically by using a Schmitt Trigger input). That is, the input level at which the monitor actually detects a logic 0

shall be at least 0.3 volt lower than the level at which it actually detects a logic 1. If the monitor sync processing

circuits are designed around the 3.3 volt logic family, then the sync inputs must be 5 volt tolerant.

3.4.6. Sync Signal Loading

TTL input loading shall be equivalent to one TTL input load. When logic 0 is asserted by a sync input, the

maximum current source from any single monitor sync input to the driver is 1.6 mA. When logic 1 is asserted,

the maximum current source from the driver to any single monitor sync input is 400mA.

3.4.7. Abnormal Signal Immunity

The monitor shall not be damaged by improper sync timing, pulse duration, or absence of sync, or abnormal

input signal amplitude (video and/ or sync too large or too small), or any other anomalous behavior of a

graphics card video generator when changing modes, or when any combination of input signals is removed or

replaced. Additionally, under these conditions, the monitor shall not cause damage to the driving source.

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3.5. Interface Boards (Digital TMDS Input)

3.5.1. The interface board will house the Panel-Link receiver , and transmitting TTL level signals into LCD Module to

driver the LCD display circuit.

3.5.2. Video Signal Amplitudes

This video inputs consist of TX 0 , TX 1 , TX 2 and CLK signals, each with its own shielded twisted pair.

These video signals are digital levels, when each signal pair is terminated by a normal 100 ohms .The panel-Link

signal transmitting over the cable is based on 3V DC offset with 0.5V amplitude.

3.5.3. Video Signal Termination Impedance

This panel link signal termination shall be 100 per pair which shall be resistive with a negligible reactive


3.5.4. Signal Connector (DVI-D 24 pin)

This signal cable connector shall be white color, molded over and shielded twisted pair cable with 50

impedance per line or 100 10% per differential pair. The cable shall be 2000 mini-meters long.

3.6. User Controls and Indicators:

3.6.1. Power On / Off Switch

The monitor shall have a power control switch visible and accessible on the front of the monitor.

The switch shall have no effect on the operation of the AC / DC converter. Instead, it shall interrupt the DC

supply to the monitor.

3.6.2. Power Indicator LED

The monitor shall make use of a LED type indicator located on the front of the monitor. The LED color shall

indicate the power states as given in Table below.
LED Color

Power-ON Mode : Green

Power Saving Mode : Amber

3.6.3. On-Screen Display

The On Screen Display system shall be used, controlled by a select button (SELECT), a menu button (MENU),

a plus (+) button and a minus (-) button. If the buttons remain untouched for OSD turn off time while displaying

a menu, the firmware shall save the current adjustments and exit. Also, if the video controller changes video

mode while the OSD is active, the current settings shall be saved immediately, the OSD turned off, and the new

mode is displayed.

A. Menu Operation

Pressing the MENU button the first time brings up the first menu level. The (MENU) button is used to enter

and exit the OSD menu. Pressing the MENU button brings up the second menu level for the item selected.

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B. OSD Controls

Item Description

Brightness Backlight Luminance of the LCD panel is adjusted.

Contrast A gain of R,G and B signal is adjusted.

Color Temperature 9300K, 8200K, 7500, 6500K, 5000K And User settings.

Auto Adjust Clock system auto adjustment, about under 5 sec.

Left/Right The indication screen is horizontally moved right and left (1 pixel pitch)

Up/Down The indication screen is vertically moved up and down (1 pixel pitch)

Pixel Clock The ratio of dividing frequency of the dot clock is adjusted.

Phase The phase of dot clock is adjusted.

OSD Language Select the language used for the OSD menu from between English, French, Italian,

Deutsch, Spanish, Japan, Simple Chinese and Traditional Chinese.

Recall Defaults All data copy from factory shipment data.

OSD Position The OSD indication position can be selected.
3.7. Monitor Modes and Timing Capability:

3.7.1. Format and Timing

The monitor shall synchronize with any vertical frequency from 56 to 76 Hz, and with any horizontal frequency

from 30 to 81 KHz. If the input frequency is beyond the specified range, the monitor shall display a warning

screen indicating that the input frequency is out of range. Under no circumstances shall any combination of

input signals cause any damage to the monitor.

3.7.2. Factory Assigned Display Modes

There are 11 factory pre-set frequency video modes. These modes have a factory pre-set for all characteristics

affecting front-of-screen performance. When the system is powered-on, previously stored screen

parameters for a pre-defined mode will be recalled if the operating mode is one of those stored in memory. If

the operating mode is not one of those stored in memory, the monitor CPU will select the PRESET timing for a

mode that is the next lowest in horizontal scanning frequency to the mode being currently used. The screen

parameters may be adjusted by the use of the front bezel controls and then may be saved as a user defined

mode. The monitor shall include all the preset video timings shown in the following page.

3.7.3. Mode Recognition Pull-in

The monitor shall recognize preset modes within a range of +,- 1KHz whichever is less for horizontal ; and

within +,- 1Hz for vertical.

3.7.4. User Display Modes

In addition to the factory pre-set video modes, provisions shall be made to store up to 15 user modes. If the

current mode is a user mode, the monitor shall select its previously stored settings. If the user alters a setting,

the new setting will be stored in the same user mode. The user modes are not affected by the pre-set

command. If the input signal requires a new user mode, storage of the new format is automatically performed

during user adjustment of the display (if required).

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Preset Timing Chart
Chroma FH Pixel Rate Sync Polarity
No Timing Modes, FV(Hz)
Timing (KHz) (MHz) H V
1 102 VGA 720 x 400 70Hz 31.47 28.322 - +
2 103 VGA 640 x 480 60Hz 31.47 25.175 - -
3 109 VESA 640 x 480 75Hz 37.5 31.5 - -
4 116 VESA 800 x 600 60Hz 37.88 40 + +
5 110 VESA 800 x 600 75Hz 46.88 49.5 + +
6 118 VESA 1024 x 768 60Hz 48.36 65 - -
7 141 VESA 1024 x 768 75Hz 60.02 78.75 + +
8 126 MAC 1152 x 864 75Hz 67.5 108 + +
9 179 SXGA 1280 x 1024 60Hz 64 108 + +
10 131 SXGA 1280 x 1024 75Hz 80 135 + +
11 333 WSXGA 1680 x 1050 60Hz 65.3 146.25 - +

NOTE: (1)76HzFV: monitor can display but doesn't guarantee.
(2) FH=85KHz, or Fv=80Hz: Power Save (OSD warning invalid mode).

3.8. Controller Requirements

3.8.1. General Requirements

The monitor shall include a controller capable of converting the analog RGB signal from a standard WSXGA

resolution video controller in the CPU to a signal which can be displayed on the panel. The controller will

include a PLL, A/D converters, and other circuitry necessary to perform its function. The PLL shall be stable

enough to ensure that a static image from the CPU is placed in the same physical location on the flat panel in

each frame.

3.8.2. Video Stretching

The monitor shall contain provisions to "stretch" the video signal, so that an input signal from the computer in

any resolution smaller than 1680 x 1050 is automatically expanded to fill the entire screen.

3.8.3. Panel Timing and Interface

The controller supplied with the monitor shall control all panel timing. This controller shall adequately insulate

the monitor from the computer, so that no possible combination of input signals from the computer shall

cause damage to the flat panel or any other component of the monitor. The LCD panel interface shall support

the TFT standard.

3.9. DC - AC Inverter Requirements:

The frequencies used by the DC - AC inverter used to power the backlight shall be chosen so as to prevent any

noticeable effects on the flat panel (such as a rolling effect).

3.10. Power Supply Requirements

The AC to DC converter power supply for the monitor shall be an integrated power supply. This power supply shall

have an IEC receptacle for mains power input and provide sufficient power for the monitor, the backlight assembly

and the "Dell Sound bar", and shall meet all requirements specified in Table 2.

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Table 2. AC TO DC Converter Requirements

The operating range shall be from 90 to 132 and 195 to 240 VAC sinusoidal for all
Input Voltage Range
models specified.

Input power frequency range shall be from 47.5 to 63Hz over the specified input
Input Frequency Range
voltage range.

Power consumption for the monitor shall be less than 49W over the specified voltage
Power Consumption and frequency ranges. In power off mode the power consumption will be less than
1W (at 90VAC~240VAC).

The AC input shall be fused and become electrically open as a result on an unsafe
Line Fuse
current level. The fuse may not be user replaceable.

The power supply shall start and function properly when under full load, with worst
Initial Cold Start case conditions of input voltage, input frequency, operating temperature, and cold
backlight lamps.

The inrush current must be limited to 42A when operated at 120VAC, and 80A when
Inrush Current operated at 220VAC. In - rush current is measured at an ambient temperature of 25
C, with the unit temperature stabilized in the power - off

The power supply shall not be damaged when switched ON for one second and OFF
Hot Start Cycle for one second for seven consecutive times after operating for one hour at full load,
25C, and nominal input line voltage.

The power supply shall contain protection circuitry such that the application of an
Under Voltage input voltage below the minimum specified in this table shall not cause damage to
the power supply unit nor cause failure of the input

The power supply shall operate within IEC 801-4 (1KV) and IEC 801 -5 (2KV) for
Line Transient the domestic U.S. Version. The UPS power supply shall operate and comply with CE

3.11. Display Communications Channel

The monitor assembly shall provide a display communications channel that conforms to VESA DDC2B hardware

requirements. This configuration shall contain the 256-byte EDID file as specified by VESA E-EDID Standard. The

monitor contains a separate EEProm for each video input to store EDID information. Once the EDID is programmed

there is a write protection that is enabled so that the EEPROM cannot be overwritten.

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4.1. General Requirements

The panel used as the display device shall be a WSXGA resolution, 20" diagonal, TFT-LCD.

4.2. Panel Timings

The controller included with the monitor shall translate all video timings from the CPU that meet the timing

requirements listed in Panel specification into timings appropriate for the panel. Under no circumstances may the

controller supply the panel with timings that may result in damage. The controller shall insulate the panel from the

CPU, so that the panel shall always be driven per its own specification regardless of the timings being sent from the


4.3. Polarizer Hardness

The outer face of the front polarizer panel shall be covered with a coating with a 3H hardness value, Haze 44%


4.4. Backlight Requirements

4.4.1. General Requirements

The backlight assembly shall be designed to support field replacement at the customer site or authorized service

center. The lamps shall have a continuous operating life of at least 50,000 hours at 25oC. The operating life is

defined as having ended when the illumination of light has reached 50% of the initial value. The lamps shall

extend a sufficient amount from the edge of the light guide that sputtering over the life of the lamps shall not

cause degradation of the luminance uniformity (such as non-illuminated bands along the edges of the display).

4.4.2. Lamps Startup Time

The backlight lamps shall start within 3 sec. of the time the monitor power switch is pressed or the monitor is

restarted from a power - down mode .The starting time shall stay below 3 sec. for the minimum expected life of

the lamps.

Test conditions are as follows:

Ambient Light ---------------------- < 1.0 lux.

Temperature-------------------------- 10oC

Inactive Time ----------------------- > 24 hours

4.5. Defects:

4.5.1. Visual Inspection

The LCD panel shall be inspected with all pixels set to white, black, red, green, and blue. The color variation,

brightness variation, and overall appearance must not be perceived as poor quality by Lite - On. Areas and / or

parameters considered questionable shall be subjected to detailed measurements.

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4.5.2. Display Degradation

Over the life of the product, variation of the parameters specified in Panel specification shall be maintained

within reasonable limits. The panel must not exhibit any significant defects while in operation (excluding the

CCFL operation). This does not in any way change the warranty given by the panel manufacturer.

4.5.3. Light Leakage

Except for the active display area, there shall be no light emission visible from any angle from any other part of
the display. For this test, the ambient illumination will follow the panel specification 300 to 700 lux.

4.5.4. Allowable Defects

No cosmetic defects are allowed except those specified below. The conditions of visual inspections are as


Viewing distance is to be approximately 35cm.

Ambient illumination is to be 300 to 500 lux.

Viewing angle range shall be 160 degrees Horizontal and 160 degrees vertical typically.(AMLCD)

Defects not apparent within one minute shall be ignored.

4.5.5. Defect Terminology

Below table is the descriptive terms used in classifying defects.
Dark Spots/Lines Spots or lines that appear dark in the display patterns and are usually the result
of contamination. Defects do not vary in size or intensity (contrast) when contrast
voltage is varied. Contrast variation can be achieved through the use of varying
gray shade patterns.
Bright Spots/Lines Spots or lines appear light in the display patterns. Defects do not vary in size or
intensity (contrast) when contrast voltage is varied. Contrast variation can be
achieved through the use of varying gray shade patterns.
Polarizer Scratch When the unit lights, lines appear light (white) with display patterns dark and do
not vary in size. Physical damage to the polarizer does not damage the glass.
Polarizer Dent When the unit lights, spots appear light (white) with display patterns dark and do
not vary in size. Physical damage to the polarizer that does not damage the
Rubbing Line Horizontal or diagonal lines that appear gray with the display patterns dark and
may have resulted from an " out of control " rubbing process on the polyimide or
" waves " on the BEFs or prism sheets .
Newton Ring The "rainbow" effect caused by non-uniform cell thickness.
Mottling When the unit lights, variation / non uniformity (splotchiness) appears light
(white) with the display and might vary in size.
Dim Line When the unit lights, line(s) in the minor (vertical) or major (horizontal) axis
appear dim, but not completely on or off.
Cross Lines Off When the unit lights , lines in both the minor and major axis do not appear.
Bright / Dark Dot A sub - pixel (R, G, B dot) stuck off / on (electrical).

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4.5.6. Smudges, Streaks and Smears
When viewing the panel oriented so as to maximize reflected light, there shall be no visible smudging,

streaking, smearing or other non-uniformity from contaminants, fingerprints, or defects in any of the visible

surfaces. This is independent of whether the unit is operating or off.

4.5.7. LCD Inspection
Put LCD panel on inspection table and illuminate the panel with a daylight fluorescent lamp located above the

panel surface such that the luminance at the LCD panel is between 1000 lux. and 1500 lux. Defect limits are

given as following.

Average Diameter
Acceptable Number Minimum Separation
Smaller of (L+W)/2 or L/20 + 2W
< 0.1mm Non countable N/A
0.1mm - 0.3mm 10 15mm
0.31mm - 0.5mm 10 15mm
0.51mm - 1.25mm 5 15mm
1.26mm - 2.5mm 3 25.4mm
2.51mm - 0.3mm 3 25.4mm
Greater than 3.75mm None Not applicable

Allowable distance between spots of two sizes is the minimum separation number for the smaller spot.

Therefore, if there are two spots, 1.30mm and 0.4mm in diameter, they must be at least 15mm apart.
Note: Per panel specification, over the life of the product, variation of parameters specified in
Panel specification shall be maintained within reasonable limits. Check supplier quality
inspection criteria for the detail information.

5. Optical Characteristics:
5.1. Brightness uniformity

The uniformity is determined by using a photometer (CA-210) to measure the 9 points luminance in front of monitor

after at least 30 minutes warm up. It shall be test at 1680x1050/60Hz mode and full white square pattern with contrast

and brightness in default value. The values specified are at an approximate distance 20 cm from the LCD surface and
at 0 viewing angle.
5.1.1. The 9 test points are defined as the right


5.1.2. The brightness uniformity is calculated as below :

Brightness uniformity 75

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5.2. Contrast ratio (CR)

The contrast ratio is determined by using a photometer (CA-210) to measure the maximum and minimum luminance in

front of monitor after at least 30 minutes warm up. It shall be test at 1680x1050/60Hz mode and full white/full black

square pattern with contrast/brightness in default value. The values specified are at an approximate distance 20 cm

from the LCD surface and at 0 viewing angle. The contrast ratio is calculated as below:

CR = (Max. full white luminance) / (Max. full black luminance)

CR = 800: 1(typ)

5.3. Response time

The response time is defined as below:

Tr + Tf: 5 msec typ.

5.4. Viewing angles

The viewing angles are measured at CR=10 as below:

Horizontal Left: 80 degrees typ. (M201EW02 V1);

Right: 80 degrees typ. (M201EW02 V1);

VerticalUp: 80 degrees typ. (M201EW02 V1);

Down: 80 degrees typ. (M201EW02 V1);

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5.5. Chromaticity

The color chromaticity is measured by a photometer (CA-210) at 1680x1050/60Hz mode and full white square pattern

with contrast/brightness in default value. The x and y co-ordinates for 9300K, 8200K, 7500K, 6500K and 5000K. Preset

mode shall be as below:

9300K Preset : 0.253x0.313 ; 0.268y0.328

7500K Preset : 0.269x0.329 ; 0.285y0.345
6500K Preset : 0.283x0.343 ; 0.299y0.359

5000K Preset: 0.314x0.375 ; 0.329y0.389

8200K Preset: 0.262x0.322 ; 0.277y0.337

5.6. Brightness

The uniformity is determined by using a photometer (CA-210) to measure luminance on the center of screen after at

least 30 minutes warm up. It shall be test at 1680x1050/60Hz mode and full white square pattern with contrast at

default and brightness at max conditions. The values specified are at an approximate distance 20 cm from the LCD

surface and at 0 viewing angle. The brightness at 6500K Preset mode shall be 240 cd/m min. (M201EW02 V1)
Note: Per panel specification, over the life of the product, variation of parameters specification Panel
specification shall be maintained within reasonable limits. Check supplier quality inspection
criteria for the detail information.

6. Environmental Requirements:

6.1. Temperature Ranges

Operating Temperature (guaranteed functional performance): 0oC to 50oC

Operating Temperature (guaranteed optical performance): 5oC to 35oC
Shipping Temperature: -20oC to 60oC

Storage Temperature: -20oC to 60oC

6.2. Humidity

Operating (non-condensing) : 10% to 80%

Shipping (non-condensing) : 5% to 90%

Storage (non-condensing) : 5% to 90%

6.3. Altitude

Operating 0 to +12,000 feet [3,658m].

Equivalent to 14.7 to 10.1 psia.

Shipping (Non-Operating) 0 to +40,000 feet [12,192m].

Equivalent to 14.7 to 4.4 psia.

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6.4. Vibration Test Procedure

6.4.1. Vibration System. Perform in accordance with Liteon Spec.

6.4.2. Fixturing. The packaged product shall be secured to the vibration table to prevent the package from moving off

the vibration surface during test.

6.4.3. Test Axes. The packaged product shall undergo random profile vibration on all six (6) surfaces for a duration of

30 minutes per surface.
6.4.4. Random Vibration Spectrum. The total random vibration spectrum energy shall be 1.15 Grms and follow

spectrum specified below.

Random Vibration Spectrum Break Points
Frequency (Hz) PSD , G /Hz
1 0.0001
4 0.01
100 0.01
200 0.001

6.4.5. Acceptance Criteria. The package and its contents should be inspected and evaluated for failure against the

Acceptance Criteria. Ref. Section 4.0 Packaged Product Testing.

7. RGB settings
The red, green and blue areas shall be measured at a digital input signal full white square pattern at 1680x1050,

fH=65.3kHz/fV=60Hz mode with default color temperature setting (Normal Preset = 6500K). The u and v co-ordinates for

R, G and B shall be setting as follows:

Red u 0.411, v 0.503

Green u 0.140, v 0.548

Blue u 0.200, v 0.224

8. Color grayscale linearity

The co-ordinates of color grayscale shall be measured at a digital input signal full grayscale square pattern at 640x480,

fH=31.5 kHz/fV=60Hz mode with default color temperature setting (Normal Preset = 6500K). The measured u and v

co-ordinates at grayscale 255,225,195,165,135,105 should meet the spec. as follows :
uv= ((umaxumin) + (vmaxvmin)) 0.02
18 ACER AL2002W

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3 R


13 9

Left LCD



1 1 7749205865P0A CARTON 8340004337
2 1 EPS-R
7749106340P0A 8340005384
3 1 EPS-L
4 1 7749001520P0A P.E. BAG 8340002824 LCD MONITOR
5 1 7749000200P0D P.E. BAG 8440000038 SIGNAL CABLE
6 7749600420P0A TAPE 8440004457 914M
7 1 7749600200P0A TAPE 8440004216 25mm(W)
8 1 7740100200 WIRING TIES 8440000046 250x2.5mm
11 1 7740416041P0A STAND
12 1 7749002220P0A PE-BAG 8440005039 300x300x0.05mm
13 1 7740100200 WIRING TIES 8440000046 250x2.5mm
ACER AL2002W 19

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6 7




1 7737641200P0A RC 1
2 7737816380P0A BRACKET ASS'Y 1
3 7746505130P0A INSULATOR 1
4 5114300811P POWER BD 1
5 5113301834P INTERFACE BD 1
7 7742240251P0A FC 1
8 7742303000P0A LENS-LED 1
9 7742808011P0A PUSH-BUTTON 1
11 7742005070P0A RUBBER 1
12 7740416041P0A BASE STAND 1
13 7742616171P0A STAND COVER 1
14 7742616161P0A HINGE COVER 1
15 7738001670P0A HINGE ASS'Y 1
11. Schematics and Layouts:
ACER AL2002W 20
11.1 ACER_AL2002W (T20BAUW-G1)_BLOCK DIAGRAM Go to cover page
1 2 3 4 5 6 7 8 9 10 11 12 13
1 2 3 4 5 6 7 8 9 10 11 12 13
SCHEMATIC REV 01 PTB-1740 5 Oct. 2006 PCB No.
ACER AL2002W 21
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1 2 3 4 5 6 7 8 9 10 11 12 13
500V X7R
T802 SCK103 R818 T801 +22V
RING CHOKE 0.51/1W D809
L 1 ER28 ER1002FCT
3 10
D807 D808
A G 3
C820 C809 RL206 RL206
C817 C851 D811


1000P/250V 4700P/1KVX7R C806 330U/35V 330U/35V 0.1UF
R801 P6KE150A
1M 0.01U/1KV R828
2 C801 C819 D805 D812
N 1/4W RL206 R817 51K
0.33U/275V 0.1U/275V GND RL206 + R804 9 GND GND GND
C805 1K
MGF C825 2M


4700P/1KVX7R 100U/450V 1/4W
C808 PG108R 1
1000P/250V BEAD