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Here is the uncropped and non-resized version of the image on my wiki (https://retro.woof.tech/index.php?title=Apple_Macintosh_IIci):

I'm very interested in 3 units, let me know!

This is a common misconception and it totally depends on what kind of failure the CRT is experiencing. Yes, Rejuvination is not something that can be used to make a CRT last a lifetime. Once the filament degrades far enough there is just not enough emissions to show a bright picture...

Can you check out UG6 and UF8A as well? UG6 is responsible for the final video signal going to the CRT, although its quite possible (and likely) this fault happens at an earlier moment. I think its interesting that its just missing 2 pixels every 2 pixels though, as that is a pretty binary...

This is what I expect to see from a bad capacitor on the vertical signal to the yoke. Its analog distortion I've sadly never touched Colour Classic board, so I can't check for you. But I'd start with the cables coming from the yoke, follow back the two cables for vertical. The capacitor that...

Just to be sure, what did you replace the capacitors with? The audio circuit exists out of a bunch of caps that often leak, so I assume you replaced them. If you replaced them with an inadequate replacement this may cause audio issues. If the audio signal is affected, so may their working in...

I just received the CRT rejuvenator, I plan on cleaning it up first and recapping where needed. I don't have the right connector for the tube yet too, gonna have to work on that or convert one of the adapters I received with it (But preferably I would just find the right adapter) Hope to give...

@elemenoh Thanks for all the work so far! Any chance you could export the PDFs so they're searchable? Right now the text is being stored as vectors so PDF readers can't search through them

Right now I swapped the CRT and that fixed the issue. This brings us to the following conclusions: - The Motherboard, analog board and power supply are most likely fine - The CRT Board (which attaches to the back of the tube) is most likely fine   And leaves us with the following possible...

Shipping on Mouser kills me at the moment though (€20 for a €0.50 part) The cap is unlikely to be a problem at this moment though, as a replacement tube doesn't show this issue.

Thanks! I already made sure its not the CRT board, I've swapped that out and the issue persisted. The same board works fine on a different CRT (See my above post, I use the same CRT Board) The only thing I've not tried replacing is the yoke, everything else has been swapped at some point...

The burned connector (Although it mostly just looks brittle?) is on the CRT that actually functions correctly... haha The calibration on both screens is really well done, so I'd rather not remove the yoke (at this point). I think I have another SE that has horrible calibration so I might...

CRT swap didn't have the issue, so its either the CRT itself or the cables to it... Can anyone explain this behaviour of the CRT? I don't understand how the tube itself can cause this to happen I'll need to fix this CRT I have in it now though, as it has its molex connector killed...

I'm reluctant to do so as the contacts themselves look good and nothing happens if I move it around. Also this behaviour is quite unlikely from a bad connection on the data line on the CRT or CRT board

CRT board swap did not resolve the issue or chance the behaviour in any way... So its either on the motherboard, some other part on the analog board (resistor, ic, etc.) or the tube itself (which feels unlikely, as I don't understand why the electron gun would act this way)

Sadly recapping the Analog board didn't show any results, horizontal image still collapses weirdly on reset and there still is bleeding/ghosting to the right. All caps (Samyoung branded) measured reasonably within spec (all capacitance values are met higher then spec, ESR was a bit up but...

As there is no way for my to edit the wiki unless I "request" an account, I'll just post the details here: Analog board 820-0206-C 1 x 4700uf 16v - lead spacing 7.5mm - diameter 18mm 1 x 1000uf 16v - lead spacing 7.5mm - diameter 16mm 1 x 3.9uf 35v bipolar - lead spacing 7.5mm - diameter...

Found some information about the caps used on the analog board over here: https://wiki.preterhuman.net/Macintosh_SE/30#Replacement_capacitors_.28analog_board_.26_PSU.29 No sizes and such though, I'll measure it myself and update it. Here is a pic of the mainboard recap I posted ealier about...

Interesting thread! I have a fair amount of experience with PCB Design and I think it would be pretty interesting to see a remake of the SE/30's PCB, my biggest bottleneck would be to make all the individual parts and models to put on the board. Routing traces is just a fun puzzle and some...

Did a full recap of the board, this resolved audio issues and reset problems but sadly the ghosting is still there. I think the analog board is in need of repairs yeah I calibrated the brightness / cut-off, but on a cold boot it is way too bright (so bright that on its lowest setting there...