Hello @jslatten,
FR38 is a one component of the VBUS voltage filter which is used to detect USB voltage by FX3 MCU. It is possible to burn FR38 if voltage from USB is higher than 6V. As a consequence FX3 MCU may be burned out as well.
Could you measure voltage between GND and VCC_EXT and between GND and VCC_INT on J21 pinheader as shown in picture bellow.
