Audi A3 8l - Audi concert 2 - displays nothing after disconnecting the power sup

Hello, I have a problem with the above-mentioned radio, because I took out the radio to connect the changer emulator as aux, everything worked perfect but I still had to connect these 2 cubes from the subwoofer and emulator, but I did not have time and pins, I left the radio a little out for later, because it's hard to come out with these extras. While driving, there was some grinding in the speakers, the radio turned off and turned on again, but there was no sound in the speakers, so I turned off the radio and turned on after about 2 hours and the radio worked normally, the sound was etc. but after about 10 minutes there was a grinding and silence again. And being at home, I took out the radio completely, disconnecting the power supply and I heard that something was flying inside, I dismantled the radio and there a 10 cent coin (????) I took it out, because I thought it probably did some short circuit, but after inserting the radio it only lights up buttons + display, I tried the same in another car, you don't know what was the reason? I would like to add that before disconnecting the radio from the power supply, it normally displayed "RMF MAXXX", etc. in the attachment I added a photo of what it looks like. IMG_201705...453551.jpg Download (1.2 MB)

Radio to be repaired, the coin must have short-circuited and therefore does not work

Hello, maybe some measurements at the beginning? Do you have a meter? Check CPU supply voltage, 3.3v, 5v and the entire 12v line. If you do not feel up to your strength, have the radio serviced.

Well, unfortunately, I don't even have a gauge, and I rather don't "sit" in such things, I have just found a topic similar to the concert and I feel something is gone.
The Audi Concert radio displays nothing
I will try to find a service, because they have not taken up in two, if it turns out that the processor is actually burnt, you can get / buy it somewhere?

Rather, it will be hard to buy a processor. Check ebay. Maybe there you will find, for example: with a damaged LCD for pennies.

I handed over to the site and the processor was actually burnt
And now, gentlemen, if I bought a Concerta 2 from a4 b6 / B7 and changed this front panel because it is connected to the plugs there, should it go? Except that mine worked on the can rail because I have 2 cables in my ankles.