I have a Xenarc 700TSV. I haven't completely troubleshot it yet, but it seems that the touchscreen is the source of lines - not dependent on if the engine is running, but it does react to touching the screen - scroll across the screen. As if the refresh rate wasn't right, but it is. To eliminate the wiring as a cause, I hooked up a standard monitor to it, with the majority of the cabling still in place. I didn't see any lines on the monitor.
Has anyone else had this problem? Any thoughts?