Today hasn't been a good day.

I have recently upgraded to a nav 4 unit and have installed a digital TV module. For the last few weeks everything has gone very well.

Today for no reason the picture quality on my screen is done to about 25%. It’s practically impossible to read anything on the screen.

All the functions seem to work I just can't read them.

On the odd occasion it has flickered but switching the ignition off then back on has always fixed the issue. This time nothing.

I have tried disconnecting the battery. No change.
Disconnecting all of my mods and connecting the old units up and again no change.

Any ideas?