Can anyone help diagnose why my nav screen (4:3 bordmonitor) has got a thin (pixel type) colour line dividing the viewed image in half. The line appears over the radio, cd, tape, sat nav and tv features. This may not be connected but this came up shortly after installing a tv in motion cable and av lead (connected to a DVD player). I have tried putting back the tv module wiring as factory but the line is still there.

Edit: Need Kiwi Jochen and Brian BMW to get in touch. You guys solved my problem last time.