Hi I hope somebody can help me, I have built this kit https://tutorial45.com/electronic-project-diy-advanced-clock/ from Aliexpress, great looking kit, but I get symptom of random lights coming up piezo is screaming, and no clock functions at all, I removed the 12MHz Xtal and used a frequency generator to emulate 12MHz, the kit started working properly, replace the 12MHz and still the same issue, the fact that the freq gen worked suggests the circuit is fine and for some reason the Xtal does not oscillate. does anybody have any ideas please. ill upload a schematic when I can find it.