hs 81 servo

so i got one of these servos to put in my kyosho hor. hooked it all up tonight and couldnt keep from buzzing and finally shutting down my system. i'm running a mamba micro with a lipo 2 cell 7.4 pack. if srevo was plugged in my system would not work. unplugged esc worked fine. i took servo apart and seen the board is burnt. what happened?

Sounds like there was too big of a load on the servo for too long and something overheated and burned. What was causing it to buzz? Was the servo horn not centered properly on the servo causing a load to constantly be applied to the servo?
If you want to send it in we can check it out.

no load at all it was on a motorcycle. already tossed it oh well