68kMLA Classic Interface

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Vias on late early Mac boards
Posted by: Sideburn on 2023-10-22 22:23:52
Anyone know know if the vias on these old boards connect to traces in the middle layers?

I ask because I’ve got some badly corroded vias and traces forcing me to have to drill them out and run a wire through the board.
Posted by: LaPorta on 2023-10-22 22:32:28
Which Macs are we talking about?
Posted by: Sideburn on 2023-10-22 22:51:08
This particular one right now is a portable.
But also got some iicx’s.

Here’s the exact onesimage.jpg
Posted by: MacUp72 on 2023-10-23 00:55:42
ooouch..does it work?
Posted by: Phipli on 2023-10-23 01:00:26
Anyone know know if the vias on these old boards connect to traces in the middle layers?

I ask because I’ve got some badly corroded vias and traces forcing me to have to drill them out and run a wire through the board.
Yes, on even boards like the SE there is an internal ground and power plain that some vias connect to.
Posted by: demik on 2023-10-23 01:04:11
If they do, it's power planes only (on a IIcx that is). You can follow them using schematics
Posted by: Phipli on 2023-10-23 01:04:13
Anyone know know if the vias on these old boards connect to traces in the middle layers?

I ask because I’ve got some badly corroded vias and traces forcing me to have to drill them out and run a wire through the board.
Grab a Gerber viewer and see where they're connected in @max1zzz's reverse engineered PCBs.

github.com

GitHub - max234252/MacIIcx_Reloaded: 1:1 Reproduction of the Mac IIcx PCB

1:1 Reproduction of the Mac IIcx PCB. Contribute to max234252/MacIIcx_Reloaded development by creating an account on GitHub.
github.com github.com
Posted by: Sideburn on 2023-10-23 01:46:52
ooouch..does it work?
I haven’t finished yet. This board is 90% there though. It boots and then ram errors. It was completely THRASHED when I got it. I got it cheap on eBay. I think the seller tried to do a re-capping and threw in the towel. Lifted pads all over the place. All the connectors were melted so I replaced them. I recapped the whole board. There was lots of corrosion. Lots of broken traces. I think I’m down to the last few now…
Posted by: Sideburn on 2023-10-23 01:47:30
Grab a Gerber viewer and see where they're connected in @max1zzz's reverse engineered PCBs.

github.com

GitHub - max234252/MacIIcx_Reloaded: 1:1 Reproduction of the Mac IIcx PCB

1:1 Reproduction of the Mac IIcx PCB. Contribute to max234252/MacIIcx_Reloaded development by creating an account on GitHub.
github.com github.com
Great idea. I didn’t know they existed! Thnx.
I have EagleCad that I use for my own boards. That should work right?
Posted by: Sideburn on 2023-10-23 01:56:42
If they do, it's power planes only (on a IIcx that is). You can follow them using schematics
Ok that’s promising. I’ve got one IIcx that had such bad battery corrosion that there were green mountains all over and when I cleaned the corrosion off the chips were literally falling off the board. That whole corner where the soft power stuff is is gone. Most people would probably say the boards a goner and use it for parts but I keep thinking I may be crazy enough to try to repair it 😆
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