Hi all ,
……yesterday my kore orange cube board got fried 
. At first I tested the board in my 4 S powered quad , everything fine . Then I moved the electronics in my new heavy lifter 12 S . After takeoff everything is fine , as I descended a little bit I heard a loud boom , a few seconds later an other boom . I landed so fast as possible and at the ground , a few second the motors stopped spinning, an sounds like no pwm beeping . My cube is dead , the shottky diodes are blow up , that was the boom that I recognize.
Hi Stefan
Will it be possible that 2 wires short (touch each other) during flight? I think diode will only be burned by reverse or short.
How were those 2 ESC，are they still servicable？
Can you share the flilght log?
May I know how you determine the cube is dead?
Hi Mike,
Thx for your response. All the TVS diodes are dead , 3 of them blow up . Two near the esc pads and the one between the main terminal pads. The ESC are ( Alpha60A-HV ) . The Motors are T-Motors x605 170kv coaxial . The cube is dead because I see the smoke , usually nobody should see hidden inside the electronic parts 
. Also the VHTC125AG is gone . My setup is 12 S Lipo ( Uin50,28V )I suggest the recuperation from the motors produces a bit higher voltage. The tvs diodes couldn’t handle the power absorbing in heat so fast and blow up . The spikes killed the electronic. As I was landed my bird the board was dead. The esc’s were beeping, like the have no pwm , and the here link says connection lost . The esc’s are all ( eight ) OK. So I’m happy so far. I have no logs sorry.
That’s a picture, from my esc connection to the Kore carrier. I put some hot melt glue between the pads to prevent short them .
HI!
Did you manage to find the exact cause?
We have more or less the same setup as you and we have encountered the same thing.
help is really appreciated.
Thanks
Vishal M.