If the flight controller will power with a 5v power source from a Li-Po battery but not the USB, chances are a diode is fried. Here is how to replace a diode.
I cant speak for every flight controller but the diode I used on this one is a BAT54C.
BAT54C diodes - rover.ebay.com/rover/1/711-53...
Tools I use for repairs
Amazon.....................................
Hot air gun - amzn.to/2lmUdmR
Flux paste - amzn.to/2mD57Xl
Solder paste - amzn.to/2mqY7QJ
Solder wick - amzn.to/2ln5jbl
Helping hand - amzn.to/2mbqCB6
Flux cleaner - amzn.to/2mbokSC
Banggood.................................
Hot air gun - www.banggood.com/858D-220V-Hot...
Flux paste - www.banggood.com/BON-102-Flux-...
Solder paste - www.banggood.com/XG-Z40-10cc-S...
Solder wick - www.banggood.com/Wholesale-5-F...
Helping hand - www.banggood.com/4X-helping-Ha...
Ebay..................................
Hot air gun - rover.ebay.com/rover/1/711-53...
Flux paste - rover.ebay.com/rover/1/711-53...
Solder paste - rover.ebay.com/rover/1/711-53...
Solder wick - rover.ebay.com/rover/1/711-53...
Helping hand - rover.ebay.com/rover/1/711-53...
Repairs playlist - • Repairs Playlist
All my playlists - / @projectbluefalcon
Video editor - amzn.to/2n7sUiF
My personal vlog channel - / jcofficial3
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