I ordered a new board that I tried on the defect atomic. But I was surprized that the same randomly weak flashes still there, exept that nothing to see on the bulb.
So I checked the cables, screwed on firmly and now works nicely. Maybe it was the root problem?
Then I swaped again the boards. Still same erratic working, but now "weak flashes" are at full intensity.
I keep on searching to have a spare board if repairing successful. So from what I understand, IC105 control the lengh and IC114 trigger the strobe, right? What about the intensity?
If I want to safely analyse signal from TP1, TP3, TP4... What about an isolation transformer with the usb oscilloscope?