Troubleshooting SE/30 garbled screen, no chime before and after recap

[reallyrandy]

Any ideas?
I didn't replace the axials because they still look good.
I have a working SE, can I put the SE/30 board in the SE to see if it works there? Are they interchangeable?

 

[Garrett B]

Yes, you can use an SE/30 board in an SE chassis (the pinout to the analog board is the same).

I get a similar screen you have when I remove the ROM SIMM on my SE/30 board. Not saying that's your issue, but it might be a place to start. These boards can be tricky to troubleshoot!

 

[reallyrandy]

That's the Dead Mac Scrolls book says. These symptoms point to a missing ROM.

 

[reallyrandy]

I swapped out 4 different sets of RAM in bank A and also swapped out the ROM with my ROMinator and got the same problem. The Dead Mac Scrolls says check the ROM chip but that can't be it since the ROMinator shows the same problem. I do get a flashing "?" with the original ROM since the SCSI and floppy aren't plugged in. When the ROMinator is in there I get no flashing "?".
So, maybe the UE8 chip? It does look a little corroded and the painted numbers are missing. Could I just remove it and clean and solder it back on? Where would I get another UD8, UE8 and UF8 chip?

 

[bibilit]

The floppy icon is not complete but present, so probably a broken trace somewhere.

 

[mg.man]

Interesting... not to hijack your thread, but I have a SE/30 I recapped that boots just fine, but has a similar "garbled" screen...


Weirdly, in my case it looks like a possible "stuck" address line - possibly on that Row 8 of buffer chips. Watching your progress with interest....

 

[mg.man]

Circling back on this... thanks to a recent post by @Bolle, I found my issue(s)!

Well... I finally had a chance to do just that today. But before I took the drastic action of removing and replacing UE8, I decided, spurred on by @Bolle's post over in another thread :

...to do some more buzzing around. This was also prompted by the fact that I'd buzzed all the connections from UE8 a week or so back and they were fine. Well... whaddayaknow... @Bolle was right - I did have issues with A0 and A1 connectivity - to various places including the Video ROM, ASC and GLUE. Here's my solution :

View attachment 43401

NO, it's not pretty - I *will* tidy this up. But... just to be clear... TA DA :

View attachment 43402

NO MORE video corruption!!! Big thanks to @Bolle and the rest of the MLA community!

so probably a broken trace somewhere.

Or several - as was the case with mine!