Audi A3 instrument box problems

Good afternoon,

I need help to solve a problem with my A3. Everything started in summer when the battery said goodbye and I had to change. Before this one day the light of the painting was more or less illuminated with the car on, that is, that the intensity of the light varied and it was not because of the change of luminosity of the day. All this for a while until one day I stop working the digital screen of the box, I did not turn on, I started investigating and removing the fuse 17 of the fuse box that is on the left part of the engine, when starting the car he turns on the screen again. When the car turns off and start again, it does not turn on.
All this that I take the car every day to go to work, because a good day that I leave in garage a couple of days surprise !!!, Battery Caput !!!, it has already happened to me a couple of times and I have detected that the button of the Warning lights stays on all day.

Let's see if someone can give me a hand, in Audi they told me that a new picture for the screw, € 800 the joke.