Mismatching tube issue

[Vilepickle]

I repaired a 25" k7000 chassis board recently. In another 25" machine, I decided to try the chassis since its chassis was also a k7000, or one that looked almost identical. It worked for a little while, but I definitely had arcing inside the tube so I think the tube was a mismatch for this particular chassis.

My question is... what typically blows out if you get too much arcing like this in a tube mismatch situation? I definitely blew something out but I'm not sure what it was. I've replaced the flyback, C36, D18, HOT, and IC4 since but it's still not coming back to the state I had it. The HOT, IC4, and D18 definitely didn't read right. I did a cap kit right before it blew so it's also possible I need to re-cap kit.

[qrz]

there shouldn't be ANY arcing  in or outside the tube.

likely a neck fracture allowing loss of vacuum.


with any luck, the spark gaps did their job and didn't allow damage to cathode drive circuitry (video)

a hard arc can cause a Hout xistor short. which, in turn , may overload the power supply producing damage there.

most modern SMPS units will go into a protection mode during a high current condition averting serious supply damage

[Vilepickle]

By power supply do you mean the actual cabinet power supply? The cab this happened in is running fine after I fixed its normal chassis now.  The chassis that blew is still not working but I was going to replace many of the diodes in the early circuit soon as the next thing.

When I first blew it, I replaced the HOT only. I heard a brief second of high voltage starting to happen and then it stopped. Perhaps I blew the HOT again? Since then I've done those other components and a few were indeed not reading correctly. But it is still blowing fuses.

I've heard about the high voltage shutdown due to XRAYs and all the regulations. Would I need to do anything to get the chassis out of this "state" other than replacing components like I'm doing?

[qrz]

was referring to the monitor's onboard power supply.

sry, i tend to forget not everyone speaks tech

[Vilepickle]

No problem, I speak some but I'm still learning monitor stuff   Obviously, since I was dumb and blew this chassis with a wrong tube.

By power supply do you mean everything in circuit leading before high voltage? That's what I've been assuming so far and targeting my replacements at.

[Vilepickle]

I fixed this, I ended up blowing the HOT again since I didn't have D18 or IC4 replaced at the same time.  Woops