I have a very similar problem to this one: https://gra-afch.com/forums/topic/help-nc314-2-2-starts-up-but-no-tubes/ except I have a DIY kit with board version 2.3 with a 12V 2A power supply
LED’s light up, pink panther sound can be heard, but the tubes stay off. FW sais:
Firmware version: 1.940
NCS314 for HW 2.x HV5122 or HV5222
Temp. sensor not found.
Can you provide some hints how to debug this. Do you have reference pictures / voltages for v2.3
Thanks a lot!