Acer AL1731 Standard Timing Table, Troubleshooting, Problem Picture is unclear and unstable

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Standard Timing Table

If the selected timing is NOT included in table below, this LCD monitor will use the most suitable available

timing.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Resolution

 

 

H. Freq.

 

 

V. Freq.

 

 

Pixel Freq.

 

 

H/V Sync.

 

 

Mode

 

 

 

 

(KHz)

 

 

(Hz)

 

 

(MHz)

 

 

Polarity

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

640 x 480

 

 

31.469

 

 

59.940

 

 

25.175

 

 

-/-

 

 

VGA-480

 

 

640 x 480

 

37.861

 

72.809

 

31.500

 

-/-

 

 

VESA - 480 - 72Hz

 

 

640 x 480

 

37.500

 

75.000

 

31.500

 

-/-

 

 

VESA - 480 - 75Hz

 

 

720 x 400

 

31.469

 

70.087

 

28.322

 

-/+

 

 

VESA-400-TEXT

 

 

800 x 600

 

37.879

 

60.317

 

40.000

 

+/+

 

VESA-600-60 Hz

 

 

800 x 600

 

48.077

 

72.188

 

50.000

 

+/+

 

VESA-600-72 Hz

 

 

800 x 600

 

46.875

 

75.000

 

49.500

 

+/+

 

VESA-600-75 Hz

 

 

1024 x 768

 

48.363

 

60.004

 

65.000

 

-/-

 

 

XGA

 

 

1024 x 768

 

56.476

 

70.069

 

75.000

 

-/-

 

 

VESA-768-70 Hz

 

 

1024 x 768

 

60.023

 

75.029

 

78.750

 

+/+

 

VESA-768-75 Hz

 

 

1280 x 1024

 

63.981

 

60.020

 

108

 

+/+

 

 

SXGA

 

 

1280 x 1024

 

79.976

 

75.025

 

135

 

+/+

 

 

SXGA

 

Note: When the in put display mode is not 1280 x 1024, the image is smoothly expanded to 1280 x 1024 dots with the PW131 scaling engine. After expansion from 640x480, 720x400, 800x600, and 1024x768 resolution, the text may look not so sharp, and the Graphics may look not so proportional.

Troubleshooting

This LCD Monitor has pre-adjusted using factory standard VGA timings. Due to the output timing differences among various VGA cards in the market, users may initially experience an unstable or unclear display whenever a new display mode or new VGA card is selected.

Attention

This LCD Monitor Supports Multiple VGA Modes.

Refer to the Standard Timing Table for a listing of modes supported by this LCD Monitor.

PROBLEM Picture is unclear and unstable

The picture is unclear and unstable, please perform the following steps :

1.Enter PC to “Shut Down Windows” status while you’re in MS-Windows environment.

2.Check the screen to see if there’s any black vertical stripes appear. If there are, take advantage of the “Clock” function in OSD menu and adjust (by increment or decrement numbers) until those bars disappear.

3.Move to “Phase” function in OSD menu again and adjust the monitor screen to its most clear display.

4.Click “No” on “Shut Down Windows” and back to the normal PC operating environment.

PROBLEM There is no picture on LCD Monitor

If there’s no picture on the LCD Monitor, please perform the following steps:

1.Make sure the power indicator on the LCD Monitor is ON, all connections are secured, and the system is running on the correct timing. Refer to Chapter 3 for information on timing.

2.Turn off the LCD Monitor and then turn it back on again. If there is still no picture, press the Adjustment Control button several times.

3.If step 2 doesn’t work, connect your PC system to another external CRT. If your PC system Functions properly with a CRT Monitor but it does not function with the LCD Monitor, the output timing of the VGA card may be out of the LCD’s synchronous range. Please change to an alternative mode listed in the Standard Timing Table or replace the VGA card, and then repeat steps 1 and 2.

PROBLEM There is no picture on LCD Monitor

If you have chosen an output timing that is outside of the LCD Monitor’s synchronous range (Horizontal: 30

~80 KHz and Vertical: 56 ~ 75 Hz), the OSD will display a “Out of Range” message. Choose a mode that is supported by your LCD Monitor.

Also, if the signal cable is not connected to LCD monitor at all or properly, the monitor screen will display a message “No Input Signal”.

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Contents Table of Contents PrefaceViewing Angle Adjustment InstallationConnecting the LCD Monitor and Base UnpackingConnecting the Audio Cable Connecting the Display to your ComputerConnecting the AC Power Connecting the AV and S-Video cableDisplay Controls Setting Up the LCD MonitorPower Management System User ControlsFunction Description Adjusting the Monitors DisplayOSD Function Menu Analog RGB / Digital RGBOptions ResetComposite Video / S-Video UtilitiesLCD Panel SpecificationsAttl Video Composite Signal and S-Video Signal SupportPower Management ControlFor Digital DVI-D connector Power Supply AC InputSize and Weight Pin AssignmentProblem There is no picture on LCD Monitor TroubleshootingProblem Picture is unclear and unstable Standard Timing Table