Update:
user @testerfan helped me out troubleshooting the issue. Apparently, I/O lines connecting CPU to the many microcontrollers (such as the touch screen controller) are damaged and cannot be repaired since Nintendo engineers traced them between top and bottom layers of the board.
I ended up buying a new board for around 30 euros and console now works again.
user @testerfan helped me out troubleshooting the issue. Apparently, I/O lines connecting CPU to the many microcontrollers (such as the touch screen controller) are damaged and cannot be repaired since Nintendo engineers traced them between top and bottom layers of the board.
I ended up buying a new board for around 30 euros and console now works again.