All right. I just did not know if anyone is interested at all, cause no one reacted so far and a long time passed since the latest activities in this thread. But then here comes my story. The initial problem was no power led indicator, no ray on display, and a burnt BD237 transistor of the oscillato...

Hi!

I have fixed the power supply of my scope so now it works! (The HV winding had a short circuit as suspected.)
If anyone has similar issue or interested about the solution can contact me.

Regards,
Laszlo

Today I have removed the transformer and made some measurements on it with my LCR meter. The high voltage part was: 270ohm, 14mH, and Q=0.107 I have also made a ring test with the method and device written here: https://danyk.cz/avr_ring_en.html The different windings gave 0 rings, pictures on the s...

Hi All! A bit of time pased from the last post here... Magnus_K , did you manage to fix your scope finally? Or at least to decide if the transformer was faulty? I have on old Philips PM3214 from my father, with similar failure. It worked a while after not using for sevaral years, than it's power sup...