No voltage can be applied to any pin when the board is not powered. Looking at your schematic, I would say that it is designed to blow up the processor unless the 12V supply come sup after the 3,3V and goes down before the 3.3V rail..
Gerald On Mon, Feb 24, 2014 at 9:00 AM, Andrey <andrej.kondrat...@gmail.com> wrote: > Hello > > I have the same problem as Mauro. when I connect board power adapter, > then the power led blinks once and nothing happens. I was using UART 4 when > my board went down (This was my second BeagleBone black that died while > using UART4, but first board was at least booting up, then in 30 sec > overheating and switching off). I have double-checked all connection, and > voltage does not exceed 3.3V. I have UART connected with the Microchip > MCP2003 LIN transceiver. It was working fine until the board decided to > stop working, the worst thing now is that it's second board that died and I > don't know exact cause why it keeps destroying the boards. > > > <https://lh4.googleusercontent.com/-JoGjmSbOQqs/UwtclpbCJTI/AAAAAAAAAlA/QfvpnojtqUY/s1600/BBB-MCP2003.jpg> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
