my rear view camera was working up until today when i smelled something burning in the back of the head unit so i guess the input is fried since the screen is blank when it's in reverse.i treid another camera but same thing.

has anyone repaired their z1 or know where i can get it repaired.

Yup,  happened to me too pretty recently.   Didn't recall a burning smell.  Just the rear view camera input fried out with a black screen.  Looks like its a design problem.