Well after spending two hours at Mr Beans pad, of which about 15 minutes was to remove the Horizontal Output PCB and the rest playing Esperade and snow bros, not to mention, avoiding his dog,
After removing dozens of screws, the monitor back plastic came off revealing the insides. We both was very surprised at how clean it looked inside (not a spec of dust) and how well designed it was for easy maintenance. Parts opened up on hinges allowing super easy access
Anyway, we tried to take out the input board which looked easy until we ran into an earth cable that was screwed into the plastic in an extremely hard to reach place. So rather than proceeding any further, I was happy to dismiss that it wasn't an input board fault for now. At this point, Mr Beans was shaking his head and mumbling, "this isn't getting fixed is it". I tried my best to assure him that it will while trying to figure out what was what. First time I opened a NEC broadcast monitor. But then again, I usually have no idea what to expect on anything I fix.
Next the main chassis was at my attention but that was buried deep inside the casing. Again, I can faintly hear Mr Beans mumbling "this isn't getting fixed ever" as we had a brain storming session on how to remove the high voltage anode even if we could get to the chassis without me having to spend the night there. Anyway. after relaxing on his sofa and reading the schematics another pcb caught my attention. It was a small pcb labelled H-OUT pcb. Following Horizontal wires on the neck board back lead to this pcb. Remarkable. It's not connected to the main chassis!
At this point Mr Bean's gave me a Multi meter which I had to work out how to use as I am so used to using my own Fluke. Anyway, we found that one of the diodes, it looked like a transistor, but only two legs, was shorted. That needed replacing so we quickly removed it. Unfortunately, someone previously has had a go at this, and the screw was damaged. We cut it off and out went the pcb.
I left Mr Beans the task of trying to get that screw out, while I quickly escaped with the part I needed to repair.
After taking it home, it looks like the Horizontal output transistor had failed catastrophically including the connected Power Diode connected to it as well. This was after I wasn't satisfied that the Diode cannot be the only thing that failed.
Two parts on order and can safely say it should fix the fault. Mr Beans seems sceptical of my abilities but then again, only by testing it, will we surely know....
can't really help , might be best trying to find an old crt repair guy around ,even at that they mightn't go at it. 
