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Standard timing table, Troubleshooting – Acer AL1911 User Manual

Page 9

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9

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.

(KHz)

V. Freq.

(Hz)

Pixel Freq.

(MHz)

H/V Sync.

Polarity

Mode

640 x 350

31.469

70.087

25.175

+/-

VGA-350

640 x 400

24.830

56.420

21.050

-/-

NEC PC9801

640 x 400

31.469

70.087

25.175 -/+

VGA-400-GRAPH

640 x 400

31.50

70.15

25.197

-/-

NEC PC9821

640 x 480

31.469

59.940

25.175

-/-

VGA-480

640 x 480

35.00

66.67

30.24

-/-

APPLE MAC-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

35.156

56.250

36.000

+/+

SVGA

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

832 x 624

49.725

74.55

57.2832

-/-

APPLE MAC-800

1024 x 768

48.363

60.004

65.000

-/-

XGA

1024 x 768

53.964

66.132

71.664

+/+

COMPAQ-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

1024 x 768

60.04

75.02

80.00

-/-

APPLE MAC-768

1280 x 1024

63.981

60.020

108

+/+

SXGA

1280 x 1024

79.976

75.025

135

+/+

SXGA

Note: 1.When the in put display mode is not 1280 x 1024, the image is smoothly expanded to 1280 x 1024 dots with the PW164 scaling

engine. After expansion from 650x350, 640x400, 640x480, 720x400, 832x624, 800x600, and 1024x768 resolution, the text
may look not so sharp, and the Graphics may look not so proportional.

2. 640x400 56Hz and 1024x768 66Hz modes cannot be supported when Digital (TMDS) input.

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: 24 ~ 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