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There are two STK on conv. board, even if they are not 392-180.
To know if the STK are the problem, test the pico fuses at base for continuity. Replacing STKs require a precision soldering job, using thermal compound and taking care not to damage C board. This is not a job for beginners, and should be done by an experienced technician.
The beeping sound is most likely the high voltage generator needing replacement. This is a fairly easy job if you have some tech support to discharge the picture tube. You can go to the following link and leave them an email with your model number and your symptom and they will email you back with the part you need and they provide free tech support with instant messageing so you can do the repair yourself. the HV generator takes about a half hr to replace and takes only the basic soldering ability. heres the link. http://servicemanuals.vstore.ca/