Thank you for your help. I already ordered a new camera so i have to wait now.
It now works flawlessly (except for the touchscreen and for now the camera). The screen flickering stops after 1-2 minutes so it's not a problem.
Just a last question. I also seen that pressing around the bottom screen will make pressure to the screen (part of the LCD turning white). I would like to know if it's only for me or if it's the same for everyone.
Hey gisel213 here i aint posted in a awhile... Theres nothing wrong with your mods. I had a New 3ds xl that had the same problem black screens sound but could see recovery menu...
The answer is this bad camera open the console just remove the camera ribbon... You will have no camera but it will work otherwise... Cheers and good luck and leave that camera ribbon cable unplgged when you put it back together.
It worked!!! I turned the system off again and re-attached the camera cable and it booted! everything works again. Thanks!
Are most examples of this brick on New style systems? If so, here is a theory:
Maybe the auto-brightness feature they implemented on New styles is causing a problem somehow. And since recovery mode was very likely never updated with that feature, the screen & input in recovery mode works fine...
In other words, a hardware problem with the auto-brightness sensor & light level changing might be causing this. Which would explain why this brick is not recoverable through any software means.