The picture is jittery, The picture has double or triple image, The picture is spotty – VIEWSONIC VS11857 User Manual

Page 45: There are stripes on the screen or colours fade

ViewSonic

CD3200 42

The picture is jittery.

Make sure the LCD isn’t near Microwave Oven or other equipment.

The picture has double or triple image.

There may be reflected signals from mountains or buildings.

The picture is spotty.

There may be interference from automobiles,trains, high voltage lines, neon light, etc.

There are stripes on the screen or colours fade.

Is the unit receiving interference from other devices?

Transmission of radio broadcasting station and transmission of amateur radio and cellular
phones may also cause interference.

Place the unit as far apart as possible from devices that may cause possible interference.