Step 3: Prepare the Charger Boards
Hot glue around the base of those wires to prevent them from breaking off as you work with the board.
The blue, green, and yellow wires are not needed for this project so you can snip them off.
Connect the pads and HV out wires as shown in the pictures.
Make sure that any flux left over from soldering is removed from the boards. The HV will arc through the flux and it can catch the board on fire! It will typically arc on the narrow part of the board by the HV output wires.
I recommend cleaning the flux off with a toothbrush and alcohol.
After the board is dry it should be tested. To test it hook a voltmeter to the output and connect 3 volts from 2 AA batteries to the input.
Using the batteries will keep the current low so the board doesn't fry instantly if there is a problem.
The volt meter should read over 350 volts. If it arcs, you didnt get all of the flux off the board.
Once the board is connected to a 3.3 power supply it should put out over 400 volts.