How to Invert a Buck Boost

Unplug the device from the wall. Remove the top cover from the unit, using the appropriate screwdrivers.

Consult the unit's schematic. Locate the catch diode, inductor coil and output capacitor.

Remove the device's circuit board by unscrewing it from the base of the chassis. Mark each screw's location with a fine-tip marker. If necessary, write down the order in which each component was removed to take out the board.

Locate the solder beads holding the three parts identified earlier. De-solder these devices from the board by allowing the heated soldering iron to melt the beads. Absorb the solder as it melts away with the wick to prevent it from flowing over another connection point.

Discharge the output capacitor by holding a small bulb against the negative leg, until the bulb goes out.

Invert the locations of the catch diode and inductor coil, trading places with one another. Switch the orientation of the capacitor so that the negative lead occupies the formerly positive hole in the board, and vice-versa.

Secure each device in place with a small amount of solder on the back of the board. Allow a few minutes for the solder beads to cool completely.

Re-install all components in the reverse order as removed. Consult your removal list and schematic to ensure each device is being returned to its proper locations.