I have a Diatone GT2 all stock components, has been flying great for a couple of months. I then had a crash where the props cut into the positive battery wire. When I went to retrieve it, I picked it up, and the exposed wire then touched the metal frame at the rear causing a spark. After that, I lost any response from the flight controller. (I wasn't able to test quad after crashing and before the spark so I am only assuming this was a significant event!) VTX was still working and the receiver was still working. The CPU chip was hot when battery connected.
In response, I assumed I had blown my flight controller, so I ordered a replacement. I rebuilt the quad disconnecting all wires and resoldered everything back onto the new flight controller, with the only change being the flight controller. Everything seemed ok, I went through betaflight, without the main battery connected and could configure ok. Upon connecting the battery, I lost the flight controller, this time, the blue light no longer came on, but a red LED would now flash intermittently. CPU gets hot. Betaflight would not recognise and FC won't startup. I fear I've blown it again! I wondered if it was a short but was as careful as I could have been to avoid any. I now wonder if it might be the ESCs/motors, if I got a replacement FC I wouldn't want the same thing happening again even if I connect everything ok. I'd be really grateful for any help! So frustrating!