Peter, thank you for the reply! i had to wait a bit for it to get dark enough, but i just checked and i could not see any visible arcing inside the chassis when the terminal is powered on. there is a slight buzzing noise coming from the problem area but i suspect that is normal.
i did notice something new and potentially enlightening though, this time when i turned the terminal on i could see several lines stretching diagonally across the screen that were not there before. i also checked the transformer(?) above the power distribution board while the unit was powered on, it does not seem to be overheating. On Tue, Dec 20, 2022 at 1:09 PM Peter Coghlan via cctalk < cctalk@classiccmp.org> wrote: > I had something similar with a VT220. I didn't get around to > investigating it > before the flyback transformer failed :-( > > I can only suggest to run it for a short time with the cover off and the > lights > out while looking for any glows / discharges around the flyback > transformer, > the EHT cable, the EHT connector on the tube and the tube base connector. > > Regards, > Peter Coghlan. > > Ps: Anyone got a flyback transformer for a VT220? > > > > > i have a VT100 that is working fine (powers on, navigates setup, > > saves/restores settings, etc) but has an unpleasant burning/ozone odor > > coming from the rear of it. i suspect something is running hot but i am > not > > sure what, i do not currently have an IR camera in my hands- working on > > that. the original power supply has failed and is currently in storage, > so > > the terminal is being powered by an ATX power supply and adapter board > for > > the time being. this eliminates the usual R27 as being the culprit. > > > > as best i can tell, the smell is strongest just above the power > > distribution board, around the neck of the CRT. appreciate any > suggestions > > you might have! >
