Might've just been a dead bug that got cooked. Check for a carcass. Sellam
On Tue, Dec 20, 2022 at 2:06 PM hush hush via cctalk <cctalk@classiccmp.org> wrote: > 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! > > >
