NC314 KIT v2.3 starts but tubes don't light up

[fransParticipant]

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
Start Test
000000
111111
222222
333333
444444
555555
666666
777777
888888
999999
019400
019400
Temp. sensor not found.
DS3231_T=29
Stop Test

Can you provide some hints how to debug this. Do you have reference pictures / voltages for v2.3

Thanks a lot!

[Gra AfchKeymaster]

Hello.

You should first check the Power Supply.
If Tubes do not light up it means the Board do not receive enough power.
Please do that first.

[fransParticipant]

I tried that – the supply stays at 12V (quite precisely) while the tubes _should_ show 111111…999999.

Q1 (the power transistor) seems to get hot very quickly, and C15 (the big capacitor) seems to warm up faster than it should

[fransParticipant]

So can you provide some voltage reference points as in https://photos.app.goo.gl/Cz9PnqB14MxTdhIy1 for the v2.3 board, too?

[Author]

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