Battery damaged SE 30 help needed

[Celotine]

Ok some of you might have seen this on reddit already. I bought a nice on the outside se 30 a few weeks ago. So far I've recapped the main board, changed the ROM (ROMinator) and RAM (modern RAM 16MB), then I used the charts on the schematics to check the address and data lines. Found a bunch of broken address and data lines and fixed then (I hope). Still no change, the video isn't initializing. I even put a thermal cam on the board. Everything gets warm except the video circuit. I'll put a link to my reddit post and ask many pics as I can. Any help would be appreciated.

https://www.reddit.com/r/VintageApple/s/1NBZXqI8Sn

I'm not even sure if I attached all the wires in the right place, especially on the cpu

 

[JDW]

Welcome to TinkerDifferent!

I read through your Reddit link comments and was surprised to see that not a single person mentioned the ROM SOCKET as being the possible culprit here. Now with that said, it seems you had a lot of damage on the board, so I cannot say if there isn't something else wrong. There might be something else. But your photo also shows a ROM-inator II, which are known for having thickness issues in sockets with plastic tabs. (ROM Sockets with metal tabs shouldn't be an issue.) ROM Clips by @PotatoFi just might resolve the issue. If not, the comment at the very end on Reddit by Thomas (Amiga of Rochester) is correct. You very well may be best served by an SE/30 Reloaded Board. And unless you wish to do all that SMD desoldering and re-soldering yourself, Will at CayMac is the only guy out there currently doing the Reloaded builds as a service.

 

[Celotine]

Welcome to TinkerDifferent!

I read through your Reddit link comments and was surprised to see that not a single person mentioned the ROM SOCKET as being the possible culprit here. Now with that said, it seems you had a lot of damage on the board, so I cannot say if there isn't something else wrong. There might be something else.

Ok so I salvaged the original ROM. It was manky AF, but it was all surface crap on there. No change at all. Again with the thermal cam, the ICs on the front are getting warm like they're doing something. It's the video ICs that do nothing at all. If I assume one of these ROM sticks works, what's the next thing in line that could be bad? The video ROM? I'm gonna try the oscilloscope, I don't know what I'm looking at too much with that but I'll give it a go on the video RAM and ROM.

 

[Celotine]

Update! No activity on A(0). It blips on the scope for about 3 seconds then nothing. There seems to be activity on all the other pins on ram and ROM. Confirmed on the video ROM and UD8.

 

[JDW]

Update! No activity on A(0).

No activity from A(0) coming from the ROM SIMM?
Even with sufficiently thick ROM SIMMs, some boards warp over time. @Kay K.M.Mods posted some excellent info about that here:

https://tinkerdifferent.com/threads/smc-rom-simm-prototype.2198/post-19023

 

[Celotine]

Video ROM. I fixed it. No change. I'm thinking that cause Mac board seriously now

 

[JDW]

I took another look at your CRT photo, from your opening post. I've seen horizontal lines before with an iffy ROM socket, but not thin vertical lines. Those thin vertical lines very well could be RAM related. I realize you have good, new RAM SIMMs, so I am not suggesting those SIMMs are bad. Rather, it could be a trace leading from the SIMM sockets that is triggering the vertical line problem.

Then again, @Garrett had a machine with a similar display as yours and he tried a different approach, albeit one that didn't result in a resolution to the problem:

https://tinkerdifferent.com/threads/se-30-video-faults-horizontal-bars-vertical-lines.2728/

 

[Celotine]

Interesting, when I have time (tomorrow maybe) I'll scope out all the RAM SIMMs. If I can identify one or more that aren't properly connected, I can fix it or replace if it's more than one or 2. It'll probably be replaced though. This Mac was obviously stored on its side as all the corrosive goo went to that one side and ate that hole in the side of the frame and RF shield. It's wild how the outside of the Mac is pristine while being a disaster on the inside.

 

[Garrett]

I took another look at your CRT photo, from your opening post. I've seen horizontal lines before with an iffy ROM socket, but not thin vertical lines. Those thin vertical lines very well could be RAM related. I realize you have good, new RAM SIMMs, so I am not suggesting those SIMMs are bad. Rather, it could be a trace leading from the SIMM sockets that is triggering the vertical line problem.

Then again, @Garrett had a machine with a similar display as yours and he tried a different approach, albeit one that didn't result in a resolution to the problem:

https://tinkerdifferent.com/threads/se-30-video-faults-horizontal-bars-vertical-lines.2728/

I actually just worked on another SE/30 with this same problem. Same solution - trace from UE8 to one of the VRAM chips!

 

[JDW]

Same solution - trace from UE8 to one of the VRAM chips!

So you repaired that broken trace and the vertical lines shown in your photo vanished, correct?

 

[Garrett]

So you repaired that broken trace and the vertical lines shown in your photo vanished, correct?

Yes, correct. I didn’t take a photo after everything was repaired.