Standard Timing Table; Troubleshooting - Acer AL1731 User Manual

Standard Timing Table

If the selected timing is NOT included in table below, this LCD monitor will use the most suitable available
timing.
H. Freq.
Resolution
(KHz)
640 x 480 31.469
640 x 480 37.861
640 x 480 37.500
720 x 400 31.469
800 x 600 37.879
800 x 600 48.077
800 x 600 46.875
1024 x 768 48.363
1024 x 768 56.476
1024 x 768 60.023
1280 x 1024 63.981
1280 x 1024 79.976
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".
V. Freq. Pixel Freq.
(Hz) (MHz)
59.940 25.175
72.809 31.500
75.000 31.500
70.087 28.322
60.317 40.000
72.188 50.000
75.000 49.500
60.004 65.000
70.069 75.000
75.029 78.750
60.020 108
75.025 135
10
H/V Sync.
Mode
Polarity
-/- VGA-480
-/- VESA - 480 - 72Hz
-/- VESA - 480 - 75Hz
-/+ VESA-400-TEXT
+/+ VESA-600-60 Hz
+/+ VESA-600-72 Hz
+/+ VESA-600-75 Hz
-/- XGA
-/- VESA-768-70 Hz
+/+ VESA-768-75 Hz
+/+ SXGA
+/+ SXGA