Motor ESC failure ?

[alpinist]

Hello

Sometime, when powering up my PV+, there is an alarm and one side led doesn't light up and one of the 4 motors won't start.
It only happens randomly. I checked all the connection inside and everything looks fine. The battery is ok and I can still fly the bird if there's no alarm on power up.

Any idea ?

Thanks,

[youtube]http://youtu.be/wtnXUByLu3M[/youtube]

http://youtu.be/wtnXUByLu3M

 

[IrishSights]

Looks to me like faulty ESC or connections. Open it up and check the solder connections to the main board