1. I left the classic on with disconnected neck board for two hours and nothing changed. I had again the thin line.
2. I recapped the board, no change.
3. I resoldered LL2, PF1, PF2, BD1 and all cables to the neck board. No change.
4. I resoldered the neck board. No change.
Sound is ok. The mac chimes, when it is powered.
Has anybody schematics of the vertical deflection? I only found schematics for the horizontal deflection.