I building my own flight controller.because of global chip shortage i could not find recuired chips,sensors so decided to salvage from old flightcontroller boards.please reply your board model with clear mensions of fault.first priority should be main MCU(largest black square on board) make sure it is not burnt.followed by other sensors.also i not need osd.thank you 

I have a faulty omnibus f4 V2 pro semi working oly the resistor have blown  ...and a blown out 4 in one esc 25amp dm for more details 9025581889