Here is a pile of flight controllers that people have either tried to fix or abandoned. If your flight controller suffers any damage in a crash immediately stop using it and disconnect power. I can probably repair it. The 2nd picture shows one that required many hours of work but its alive.
I have to examine it with special equipment and this takes time. I charge $20 to inspect the board. If I fix it that charge is applied to the balance. Plan on spending $75-85 to have your board fixed. No batteries please.
Shipping charges not included.
In this series of pictures I am repairing 2 customers Blade 350 antennas. One was missing an antenna and the other wanted increased range. The stock antenna is prone to breaking off. It is also exposed inside the body ready to short out and cause a failure. Here I replace it with a socket and new high gain antenna. Nearly a 40% increase in range (depending on transmitter). If you try to do this, be careful it can be tricky. I charge $30 plus shipping and have everything in stock.
Blade 350 qx aftermarket antenna modification