Recent content by smiba

Would it be of help if I open up the patch panel I have and make some pictures of the PCB? I have a full set

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