Problem with an old Tandy CM-4 monitor

[Teo Zenios]

A while ago I got a Tandy 1000 system with a CM-4 monitor. The system worked 
fine for 20 minutes and then the monitor died. So far I havn't seen anything 
that looks burnt on the inside, but the tube doesn't light up when you 
provide power and there is a crackling noise going on. Is there a common 
issue with these old CGA monitors, and is this fixable without gutting a 
working one?