at this point you have two options: try and find a repaired chassis or replace the tube and chassis with a factory LCD. I know its a lot of money ,but if you intend to keep the machine you would be better off going that route. with the new battery, and a new LCD, you should get many years of enjoyment from the machine. Crt tubes are hard to come by, getting the chassis repaired is not difficult, however, I don't know how long Ceronix will continue to repair these chassis? Last time I sent in chassis for repair Lisa told me they were out of subs. meaning if the chassis you sent in was not repairable, they would send you a substitute repaired chassis. Call them and find out the story.
Hope this helps.
Jim