Hi Tony, Thats pretty much exactly the circuit --- This monitor is not designed to be very easy to work on - there's a metal plate right under the circuit board, and the other side of the board is right up against the neck of the CRT - makes it pretty hard to take measurements in circuit. This afternoon, I pulled it all apart, checked continuity through the flyback, and pulled the horizontal drive transistor and checked it - it appeared to still be a transistor (correct "diode" junctions from both B-C and B-E). So - I put it back together, planning to leave it for another day - on a whim I tried it, and it worked! - And I used it for a couple of hours as I checked out the rest of the machine with no further problems. I still have no idea what the problem was - perhaps a bad contact in one of the connectors, although I wiggled and jiggled everthing and was unable to deter the monitor for working perfectly after I put it back together. Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector. http://www.parse.com/~ddunfield/museum/index.html