Thank you for answer, but finally I resolved the problem (although I still have issues with logic board).
Well, it seems someone was "cooking" something in my Classic, and swapped either analog board, either CRT with yoke.
After extensive research, I realized that I have rev.B analog board, and...
No one?
I have so far replaced:
- LM317T
- IRF740 HOT
- BYV26B diode
- all of the BC558/548 transistors
- 2k2/1W resistor which supplies the TEA2037A IC
Unfortunately no change, and I am at the dead end.
The only thing more I am willing to do is to change the yoke if I find one in Europe, and...
Hello, I am a new member.
Sorry to dig this thread, but I have exactly the same problem with my Mac Classic.
My analog board is 630-0525.
I received it with leaky capacitors, which I have replaced.
Also, voltage regulator LM339 had cold solders, so I fixed that.
After powering on, with the yoke...