Test mode has very strict usage instructions. You can not hit burn a second time. To enter test mode, you enter the password 12345, then the tab key, then click burn. Do not click burn a second time at all. Use the tab key after you change settings.
Use values around 3 ms dwell period and 100 ms interval. If the ignition system works, you'll hear a tick-tick-tick from the coil (or you can see the spark if you have a plug removed)
To exit test mode, power cycle.
To test VB921's, first disconnect your coils. Grab your multimeter and test all 3 pins on the VB921. You should observe on each pin:
Then invert the spark output. With the output inverted you should observe:
If you have 5V on pin 1 and pin 2 is floating, the VB
is smoked. VB
's are easy to kill, so replace them with BIP373's
or modify the board for an external ignitor.