BT/WIFI main logic in inside SoC, can't replace it. There are few external components you may check, but you need oscilloscope, good voltmeter, some special tools and advanced electronics repair knowledge. DIY repair in home conditions is not possible. I can send you the repair manual, if you want. One thing you can do is to repair the USB port on the other Captivate. It is doable, but you still need some equipment like vacuum pump, precise soldering gun, solder wick, good flux, etc.
- BlackBerry Q10 LTE, 16GB int, BlackBerry OS 10.2.0 (main phone)
- Acer Iconia Tab A200, 16GB int, 16GB ext, ICS Android 4.0.3 (games tablet)
- Samsung i896 Captivate, 16GB int, 16GB ext, CM 11 Android 4.4.1 (backup phone)