FD200CPU-7 Ver P Troubleshooting
15
Revision B, May 2008
Video Noise
Check for an incorrect ground in the installation wiring. See specific
examples of video noise below, or visit http://flightdisplay.com/Grounding.pdf
VGA Shadowing
Most of shadowing problems are due to shielding on the wire. Locate the
point where all of the shields are connected. Cut away the shields, one at a
time, while viewing the display on the screen to observe which shield is
causing the noise. Cutting away one shield at a time will allow you to focus
and isolate the video noise issue.
Twisted pair wiring is prone to video noise. ECS VGA Wire (Detailed
under “Video Wiring Suggestions”) is recommended.
Snow or Sweeping Lines
Lines that slowly sweep up and down are a result of AC noise. This AC noise
can be generated by a power cart on the aircraft. Take the power cart off of
the aircraft. Be careful of inverter wiring, which can also cause noise. Stand
off the wires, if necessary.
If snow or sweeping lines persist, it is possible that the ground is at an
incorrect point in the aircraft. Try moving the ground to another location.
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