Can anyone tell me were the 5v step down is located on this board.o r whatever gizmo reduces the voltage to 5v is. I've bought new camera new TX and spent a ton of $$$..but have narrowed it down to this I have no voltage at the 5v test button tab on the esc board with a multimeter. So to confirm that this is my problem ,I cut and spliced the TX 5v to a 5v power supply and all seems to work except imu isn't working. So after removing the black box there is another 5v test button witch means that the imu runs of 5v too.. any help or suggestions would be greatly appreciated..