Cause: Aside from damage caused by crashes, the main reason is that a short circuit in the FPV damages the FPV wiring harness or the main controller power supply.

Troubleshooting Methods:

1、First, check if the fan wiring harness is damaged.

2、Connect the fan wiring harness to a new main controller interface to see if it works. If it works, replace the main controller.

3、Disconnect the FPV wiring harness to see if the fan works. If it works, replace the FPV wiring harness.