It's not practical to have it fixed by a shop because they'll charge
almost as much as a new monitor, and used CRT monitors in good
conditionare available everywhere now -- try CraigsList.com, apartment
dumpsters, etc. They're so plentiful that I don't even bother picking
up used 17" CRTs any more -- I've found five 19" CRTs.
Don't attempt DIY repair unless you know how to work on high voltage
stuff and easy to shatter glass (vacuum actually makes it explode). www.repairfaq.org is a good general repair guide.
The flyback is probably fine, and you may just have a bad electrolytic
capacitor or power transistor or IC in the flyback power supply or
main power supply.
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