Uuh I can actually help with this since I got my v12 guts on the table.
There is the board with the power electronics(black), the blue board controlling the screen, LEDs, speakers and such and then there is a small little green LED cable distribution board.
On the blue board there is a small coin battery
Then near the screen you can find a small blue board that is used for no-cable-connections between the blue board and the screen, button, light sensor (photo in next post because of size)