How to check computer crt monitor

I am seeking some general pointers on how to check, a 12" PC monitor.
It was working normal, then the screen callaps vertically with no video.
Any suggestions?.
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  1. 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.
  2. ken_58
    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.

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