Since FL2400 is a coupled inductor, we can fix the problem by connecting the two pins with Solder Paste. Now, let's take out the logic board. Stick High Temperature Protective Tape on J2400.

Apply low-temperature Solder Paste to the bonding pad of FL2400. Heat with Hot Air Gun at 240℃, air flow 2. Then connect the two pins with melted Solder Paste. Wait for the logic board to cool for 5 minutes. Clean with PCB Cleaner afterwards.