On Sunday, January 3, 2016 at 7:00:01 PM UTC-5, root wrote:
I have recently become aware (bothered by) what appears to be
a line moving up across the TV screen. The TV is a Samsung
4K with HDMI input, and the line that moves up the screen
appears to be a missing scan line.

The TV derives its input from a linux computer running
mplayer, and the video card is an NVidia 610. The
HDMI output goes to the TV and the vga output goes to
a monitor which I can see while the TV is playing.

The discontinuity on the TV screen is not replicated
on the monitor screen.

The moving line appears every few minutes.

I was not conscious of the problem prior to a shutdown
of the video server to increase the storage capacity.

Any suggestion of what might cause the effect, or questions
that may further clarify the phenomenon would be appreciated.

The fact that the line moves in that manner pretty much eliminates the display as a possibility, but it could still be a main board issue.

When the line appears, put up the TVs own menu. If the line disturbs the menu, it's a TV issue.