IBM 5153 CGA Monitor. Teardown and restoration. Why is it making such a loud high pitch noise?

video1.0IBM 5153 CGA Monitor. Teardown and restoration. Why is it making such a loud high pitch noise?Epictronicshttps://odysee.com/@epictronics:dOdyseehttps://odysee.comhttps://thumbnails.odycdn.com/card/s:1280:720/quality:85/plain/https://thumbnails.lbry.com/WChfETV2MXc390220560315