I've been experiencing scrolling lines across both LCD screens that I use for instruments in FSX.
I've tried the following:
1. Changing out the VGA cables for new ones. The original cables I used were many years old.
2. Setting different resolutions and refresh rates to see which work better.
3. Plugging the USB VGA card into other USB ports while disconnecting USB devices that may have been taking power needed by the screens.
4. Enabling the Intel onboard graphics in my computer's BIOS and plugging the screen directly into the onboard VGA port. This is where I currently have the screen (PFD only) plugged in.
So, after all of these ideas I'm still getting horizontal flickering that will change in speed and intensity if and only if I change the refresh rates of the screen. Right now at 800 x 600 at 60 Hz refresh rate the flickering is at its slowest speed, of course when I go to 75 Hz refresh the flickering is extremely fast and scattering all over the display.
I'd like to think that I've eliminated the possibility of a bad USB VGA card, bad cables, insufficient PC, and now exploring the possibility of something in the room giving off too much electromagnetic interference (EMI) and causing the display problems I'm getting on the small LCDs.
My current PC spec is: Intel Core i7-3770K at 3.4 GHz, 16 GB DDR3 memory, NVidia 650Ti graphics card, onboard Intel HD 4000 graphics (which has the PFD plugged into the VGA port right now), 128 GB SSD, 2 TB HDD, and one PCI USB expansion card... The NVidia card is currently driving one 27 inch LCD via the VGA port, and one LG 32 inch TV via HDMI.
Anyone have any experience with testing for EMI and how to effectively find the culprit and shield it from everything else in the cockpit?
Hoping for a permanent solution soon!