Troubleshooting; Image Position - Digital View AC-1024 Instructions Manual

TROUBLESHOOTING

General
A general guide to troubleshooting a flat panel display system it is worth considering the
system as separate elements, such as:
•
Controller (jumpers, PC settings)
•
Panel (controller, cabling, connection, panel, PC settings)
•
Backlight (inverter, cabling, backlight tubes)
•
Cabling
•
Computer system (display settings, operating system)
Through step by step cross checking with instruction manuals and a process of elimination
to isolate the problem it is usually possible to clearly identify the problem area.
No image:
•
If the panel backlight is not working it may still be possible to just see some image on the
display.
•
A lack of image is most likely to be caused by incorrect connection, lack of power, failure
to provide a signal or incorrect graphic card settings.

Image position:

•
If it is impossible to position the image correctly, ie the image adjustment controls will not
move the image far enough, then test using another graphics card. This situation can
occur with a custom graphics card that is not close to standard timings or if something is
in the graphics line that may be affecting the signal such as a signal splitter (please note
that normally a signal splitter will not have any adverse effect).
Image appearance:
•
A faulty panel can have blank lines, failed sections, flickering or flashing display
•
Incorrect graphics card refresh rate, resolution or interlaced mode will probably cause
the image to be the wrong size, to scroll, flicker badly or possibly even no image.
•
Incorrect jumper settings on the controller may cause everything from total failure to
incorrect image. CAUTION: Do not set the panel power input incorrectly.
•
Sparkling on the display: faulty panel signal cable.
Backlight:
Items to check include: Power input, Controls, Inverter and Tubes generally in this order.
If half the screen is dimmer than the other half:
•
Check cabling for the inverter.
•
For a specific backlight tube check the AC pins orientation (CAUTION: Never reverse
any DC power pins).
Also:
•
If adjusting brightness control has no effect the chances are that the VR rating or
method of adjusting brightness is not compatible or correctly connected to the inverter.
•
If system does not power down when there is a loss of signal
Continued failure:
•
If unit after unit keeps failing consider and investigate whether you are short circuiting
the equipment or doing something else seriously wrong.
Generally after common sense issues have been resolved we recommend step by step
substitution of known working parts to isolate the problem.
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