Composite Black and White monitor dead

Hi Guys, I posted this note on Vintage Computer Forums, and thought I'd see if anyone could help here too. T actually an acceptable looking TRS-80 Model 1 monitor I snagged for $3 but I figure the principles are the same regardless. It's dead. No raster and no glow in the tube neck. The board does heat uo though and there is that smell of old electronics being startled awake after many years. I've done no tests yet, but I have Sam's Facts for the model 1, and they provide a troubleshooting guide for the monitor and say what voltages should be on cetain components. I suspect something to do with the AC power supply of maybe horizontal sweep. Some faulty power transistor maybe? What I would appreciate from anyone who knows, is a link to a page or doc which explains how composite B/W monitors work. The Sam's document is great from the perspective of troubleshooting detail but it does assume you know, conceptually, just what's going on. I don't and I'd like to get some understanding before I start poking around. Incidently the SAM's fact PDF covers the 110V version while I have a 240V one. There are some differences, one of which is there appears to be no fuses in the AC circuits! Thanks Tez