I designed a circuit board to hold Intel Edison chip based on the schematic of Sparkfun Block for Intel Edison- Base<<a href="https://www.sparkfun.com/products/13045">https://www.sparkfun.com/products/13045>.
However, when I powered up the board I designed through micro USB, the Edison board makes a 1 second long cranking noise. (This never happens on the Mini-breakout board or Sparkfun base board) On the computer, nothing pops up. The serial port sometime pops up, but nothing communicates with the Edison board.
I attach the schematic. Any helps will be appreciated. I already found one mistake, USB_VBUS pin 20 is not connected to micro-usb VBUS. I'm not sure this is the cause for the mess.
Thank you for using the Intel® Edison platform.
Let us take a closer look at the schematic, however, we have to let you know that this is out of our support scope, so keep in mind that our suggestions may or may not work on your custom design. In the meantime, I would suggest you to check the Power section of the standard Breakout board schematic http://www.intel.com/content/dam/support/us/en/documents/edison/sb/mini_edison_breakout_hvm_8_26.pdf http://www.intel.com/content/dam/support/us/en/documents/edison/sb/mini_edison_breakout_hvm_8_26.pdf, and compare to know if there's something you're not doing besides USB_VBUS pin 20 not being connected to micro-usb VBUS.
We've noticed the following from your design, hopefully this information will be useful: