Harbinger One 2015 not working (LFO)

[Kardnez]

Hello,

I've finished building my Harbinger One (2015), but it doesn't work. The bulb glows continuously but quite dimly, and can only be adjusted with the Gain control. The Offset control has no effect on the bulb. The operating voltage is 18V. There's no signal coming from the circuit either, only in true bypass mode. I've checked the components without success and searched the board for solder bridges and cold solder joints. The Speed ��Pot is connected correctly. I've measured transistors Q11 and Q12, as well as capacitors C23, C24, and C25. When turned on, LED 1 flashes once.

The LFO isn't working, but as I said, there's no signal coming from the circuit either.

What could be the problem?

Thank you very much

Holger