RE: E-Board
Since you indicate that you don't have any response (not just a loss of a servo or one motor) you have 3 options of problem with the receiver (NOT the 3-in-1 board) 1) you disconnected the BEC line from the 3-in-3 to the rcvr (orange wire as noted in Shadow's reply), 2) Broken or dislodged chrystal in the rcvr (it's glued in, but you can, with care, get it loose and reseat it), 3) broken antenna wire.
Loss of all functions, single point of failure is recvr.