Sounds like quite a dramatic failure -- unless you have some particular need for a 12 inch screen or CRT, I would take the opportunity to replace with an LCD which is likely to be cheaper than a repair job.
thanks for your advise. I have bought a LCD monitor
already,but would like to troubleshoot the CRT. I am a retired electrical
supervisor, and as a hobby, I do electronic projects/gadgets, and love the
challenge of troubleshooting. Any advise would be welcomed.