Acer AL1931

1
AL1931(AM939) TFT LCD MONITOR
CONTENTS
1. INTRODUCTION .......................................................................................................................................... 2
1.1 Scope.................................................................................................................................................... 2
1.2 Description............................................................................................................................................ 2
2. ELECTRICAL REQUIREMENTS................................................................................................................. 3
2.1 Standard Test Conditions ..................................................................................................................... 3
2.2 LCD monitor General specification....................................................................................................... 3
2.3 LCD Panel Specification ....................................................................................................................... 4
2.4 Input Signals ....................................................................................................................................... 11
2.5 CONTROLS........................................................................................................................................ 16
2.6 White Color Temperature ................................................................................................................... 20
2.7 POWER SUPPLY ............................................................................................................................... 21
2.8 Plug & Play (EDID) ............................................................................................................................. 23
2.9 Audio Technical specification ............................................................................................................. 24
3. VL-903 DISPLAY CONTROL BOARD...................................................................................................... 25
3.1 Description.......................................................................................................................................... 25
3.2 Features.............................................................................................................................................. 25
3.3 BLOCK DIAGRAM.............................................................................................................................. 26
3.4 Connector Locations........................................................................................................................... 27
3.5 Connector Type .................................................................................................................................. 27
3.6 Connector pin assignment.................................................................................................................. 28
4. VK-903 Function Control key Board....................................................................................................... 31
4.1 Description.......................................................................................................................................... 31
4.2 Connector and Switch Locations ........................................................................................................ 31
4.3 Connector type ................................................................................................................................... 31
4.4 Connector pin Assignment.................................................................................................................. 31
4.5 Switch definition.................................................................................................................................. 32
4.6 LED definition...................................................................................................................................... 32
5. TROUBLESHOOTING............................................................................................................................... 33
5.1 Main Procedure .................................................................................................................................. 33
6. MECHANICAL REQUIREMENTS ............................................................................................................. 38
6.1 Vibration and Shock............................................................................................................................ 38
6.2 Package Drop Specification ............................................................................................................... 38
6.3 Dimension Size and Weight................................................................................................................ 39
6.4 Gap Spec. ........................................................................................................................................... 39
6.5 Tilt Base Rotation ............................................................................................................................... 41
6.6 Plastic Material.................................................................................................................................... 41
6.7 GAP Spec. .......................................................................................................................................... 41
7. Power Line Transient Test (IEC 61000-4-4 Fast Transients/Burst) ..................................................... 41
7.1 Peak Voltage:...................................................................................................................................... 41
7.2 Polarity : + / -................................................................................................................................42
7.3 Repetition Frequency of the impulse : 5 KHz. .................................................................................... 42
7.4 Rise-Time : 5ns ± 30% ..................................................................................................................... 42
7.5 Impulse Duration: 50 nS ± 30% .......................................................................................................... 42
7.6 Relation to Power Supply: Asynchronous .......................................................................................... 42
7.7 Burst Duration: 15 ms ± 20%.............................................................................................................. 42
7.8 Burst Period: 300 ms ± 20% ............................................................................................................... 42
7.9 Climatic Conditions: ............................................................................................................................ 42
7.10 Test Procedure: .................................................................................................................................. 42
8. Power Line Surge Test (IEC 61000-4-5 Surge) ...................................................................................... 44
8.1 Climatic Condition............................................................................................................................... 44
8.2 Test Conditions:.................................................................................................................................. 44
8.7 Display set high-resolution mode, AC input use AC 240V. ................................................................ 44

Acer AL1931 Specifications

General

Brand	Acer
Model	AL1931
Category	Monitor
Language	English

Summary

1. INTRODUCTION

1.1 Scope

Defines requirements for a 19" LCD monitor, supporting VGA and DVI, with built-in audio.

1.2 Description

Highlights LCD technology benefits like no radiation, space-saving, and lower power consumption.

2. ELECTRICAL REQUIREMENTS

2.1 Standard Test Conditions

Specifies ambient light, viewing distance, warm-up time, and equipment for testing.

2.2 LCD monitor General specification

Details panel type, display sizes, and supported display modes (VGA, SVGA, XGA, SXGA).

2.3 LCD Panel Specification

Lists pixel pitch, display color, viewing angles, contrast ratio, and brightness for specific panel models.

2.4 Input Signals

Specifies video input type (Analog R, G, B, Digital TMDS) and impedance.

2.4.2 Sync input

Describes sync signal type (separate or composite sync) and polarity.

2.4.3 Interface frequency

Lists horizontal and vertical frequency ranges for display modes.

2.4.5 85 Hz refresh rate Support

States monitor behavior for 85Hz mode and out-of-range warnings.

2.4.6 Analog Video input Connector

Details the 15-pin mini D-Sub connector pin assignment for VGA input.

2.4.7 Support Composite Video & S - Video Input

Describes composite and S-Video input connectors and signal levels.

2.5 CONTROLS

Explains how to access and use OSD menus for picture, advanced, audio, and options settings.

2.6 White Color Temperature

Lists preset color temperatures (Cool, Natural, Warm, User) and their color coordinates.

2.7 POWER SUPPLY

Specifies the acceptable AC input voltage range for the monitor's power supply.

2.7.2 Input Frequency Range

Defines the acceptable AC input frequency range for the monitor.

2.7.3 Quick specification review

Summarizes input current, inrush current, output voltage, and total output power.

2.7.4 Power Management

Mentions compliance with VESA DPMS for power saving states.

2.7.5 Power Consumption

Lists power consumption for different modes (On, Off, DC power off).

2.7.6 Power Connector

Specifies the IEC/CEE-22 type male power receptacle.

2.7.7 Inverter & DCDC Board (VP-903)

Details specifications for the inverter and DC/DC board, referencing Fujitsu panel.

2.8 Plug & Play (EDID)

States the monitor supports VESA standardized EDID files via DDC.

2.9 Audio Technical specification

Details output power, harmonic distortion, signal sensitivity, impedance, and frequency response.

2.9.2 Electrical characteristics

Lists electrical characteristics for the audio amplifier, including input voltage and current.

2.9.3 Speakers

Specifies speaker maximum power, impedance, frequency response, and distortion.

3. VL-903 DISPLAY CONTROL BOARD

3.1 Description

Describes the control board's function in converting VGA signals to LCD timing.

3.2 Features

Lists key features like microprocessor control, OSD, DPMS, and language support.

3.3 BLOCK DIAGRAM

Presents a block diagram showing the interconnection of major components.

3.4 Connector Locations

Shows the physical layout of connectors on the control board.

3.5 Connector Type

Lists connector types, makers, and pin counts.

3.6 Connector pin assignment

Details the pin assignments for various connectors (CN2, CN5).

3.6.3 CN8

Lists pin assignments for the CN8 connector, primarily for audio output.

3.6.4 CN6

Lists pin assignments for the CN6 connector, related to power and backlight control.

3.6.5 CN3

Lists pin assignments for the CN3 connector, likely for serial communication.

3.6.6 CN10

Details pin assignments for the CN10 connector, related to LEDs and buttons.

3.6.7 CN1 Digital Video input Connector: DVI-D

Provides pin assignments for the DVI-D connector.

4. VK-903 Function Control key Board

4.1 Description

Describes the VK-903 as a user interface panel.

4.2 Connector and Switch Locations

Illustrates the positions of connectors and switches on the control board.

4.3 Connector type

Lists connector types, makers, and pin counts for the control board.

4.4 Connector pin Assignment

Details pin assignments for connectors J1 and J4 on the control board.

4.5 Switch definition

Defines the function of each switch (S1-S6) on the control board.

4.6 LED definition

Explains the meaning of the LED colors on the control board.

5. TROUBLESHOOTING

5.1 Main Procedure

Outlines a flowchart for diagnosing and troubleshooting monitor issues.

5.1.1 Power Circuit Troubleshooting

Provides a flowchart for troubleshooting power circuit issues.

5.1.2 Backlights Troubleshooting

Provides a flowchart for troubleshooting backlight issues.

5.1.3 Performance Troubleshooting

Provides a flowchart for troubleshooting display performance issues.

5.1.4 Function Troubleshooting

Provides a flowchart for troubleshooting function adjustment issues.

6. MECHANICAL REQUIREMENTS

6.1 Vibration and Shock

Specifies testing procedures and levels for vibration and shock resistance.

6.2 Package Drop Specification

Details drop heights and test sequences for packaging.

6.3 Dimension Size and Weight

States the monitor's physical dimensions and weight.

6.4 Gap Spec.

Defines acceptable gap specifications between the front bezel and back cover.

6.5 Tilt Base Rotation

Specifies the tilt angles for the monitor's base.

6.6 Plastic Material

Lists the types of plastic used for different monitor parts.

6.7 GAP Spec.

Defines acceptable gap specifications between the panel and bezel.

7. Power Line Transient Test (IEC 61000-4-4 Fast TransientsBurst)

7.1 Peak Voltage:

Specifies the peak voltage level for transient tests according to IEC 61000-4-4.

7.2 Polarity:

Specifies the polarity of the impulse for transient testing.

7.3 Repetition Frequency of the impulse:

States the repetition frequency of impulses for transient testing.

7.4 Rise-Time:

Specifies the rise time tolerance for the impulse waveform.

7.5 Impulse Duration:

Specifies the duration tolerance for the impulse waveform.

7.6 Relation to Power Supply:

Defines the relationship between impulse and power supply for testing.

7.7 Burst Duration:

Specifies the duration tolerance for the burst waveform.

7.8 Burst Period:

Specifies the period tolerance for the burst waveform.

7.9 Climatic Conditions:

Lists ambient temperature, humidity, and pressure for transient testing.

7.10 Test Procedure:

Outlines the procedure for conducting power line transient tests.

8. Power Line Surge Test (IEC 61000-4-5 Surge)

8.1 Climatic Condition

Lists ambient temperature, humidity, and pressure for surge testing.

8.2 Test Conditions:

Specifies wave-shape, polarity, phase shifting, and number of tests for surge testing.

8.7 Display set high-resolution mode, AC input use AC 240 V.

Specifies display settings and AC input voltage for surge tests.

9. ENVIROMENT REQUIREMENT

9.1 Operating

Specifies operating temperature, humidity, and altitude ranges.

9.2 Storage or Shipment

Specifies storage/shipment temperature, humidity, and altitude ranges.

10. REGULATION COMPLIANCE

10.1 This product comply to the most current revisions of following regulations:

Lists various safety and regulatory standards the product complies with.

10.2 Electrostatics Discharge (ESD)

Details ESD test criteria, discharge voltage levels, and classes for contact and air discharge.

11. QUALITY AND RELIABILITY

11.1 Quality Assurance

States supplier responsibility for maintaining quality and performing inspections.

11.2 Reliability

Specifies the designed Mean Time Between Failures (MTBF) for the product.

Appendix A: Parts Lists

Appendix B: DISPLAY Assembly

Appendix C: PCBA Assembly