Standard Internal parts ID

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What are the little black squares just to the center of the craft from where the motor wires are connected? Are they repairable or individually replaceable or do you have to replace entire main circuit board?
 
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What are the little black squares just to the center of the craft from where the motor wires are connected? Are they repairable or individually replaceable or do you have to replace entire main circuit board?
MOSFET's (metal–oxide–semiconductor field-effect transistor), together they make Electronic Speed Controller - ESC.
why, do you have a burned one ?
 
Phantom Drones from EALLRC.com

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