possible bad mosfet on main boardI recently pinched my tail motor wires together and shorted them while putting the tail motor back on the shaft. The short causes the mosfet to fry on the control board. The prop will spin slowly from the connection of the battery and is no longer controlled by the speed control. If you are good at soldering you can purchase the mosfet for 50 cents at NEWARK.
Manufacturer Part No:SI2315BDS-T1-E3 UOM
Description: P CHANNEL MOSFET, -12V, 3A, TO-236; Transistor Polarity:P Channel; Continuous Drain Current Id:-3A; Drain Source Voltage Vds:-12V; On Resistance Rds(on):50mohm; Rds(on) Test Voltage Vgs:-4.5V; Threshold Voltage Vgs Typ:-900mV
I got the part number from the Blade mCPx Wiki. They said it was tested.
I can let you know next week when I rebuild mine.
Otherwise its a $70 fix for a new main board.