The board is from an Acer laptop. Power supply is about 11 Vdc plus 3 Vdc for the control circuitry. Since there is no CCF Lamp connected the circuit shuts down after a couple of seconds, but that is enough to see the gas inside the Nixie so show its presence. Re-apply the 3 V control and HVAC appears again.
Remember: no light means broken Nixie.