68kMLA Classic Interface
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| Apple Lisa 2/5 defective Video Output? | |
| Posted by: bibilit on 2017-09-03 04:40:26 Worked on the Lisa board yesterday, removed the I/O connector (a lot of mess from the battery) a lot of traces were not there anymore, so spent part of the day fixing those (have not tested anything yet, but here are some pictures for reference) I have left indicators on the blue paper for reference, 1 goes to 1 and A to A... will let you know once tested.      | |
| Posted by: MarNo84 on 2017-09-03 11:12:25 OMG! Wow - good job ;D Well, for my serial connections, I assume I have to do the same...- besides my connectors/slots didn't look that much corrodet. What did yours look like? Have any pictures? I will swap the small parts and report back 🙂 ...I don't want to remove the slots }🙂 | |
| Posted by: bibilit on 2017-09-03 12:52:13 Didn't look bad at first, but most of them were not connected anymore. | |
| Posted by: MarNo84 on 2017-09-08 14:57:17 JUST A QUICK UPDATE: it's alive and running again [ 😀 ] I finally found the bugger...it was just a broken trace between the lines R1 to C15/R15. I measured every part and trace again and finally found a missing signal - so d*mn easy at the end - no parts needed to swap, Did a quick solder work on that broken trace and everything works like a charme again :lisa2: The last steps / work to do will be the still cut serial connectors. That's a lot of wirework to do - I will rethink about that - no one needs serial connectors on their LISA? Everything was cleaned and neutralized - so no future damage. Well, I think this is done - any future updates will come here on the forums and on my repair blog / on my homepage and yery soon on my YT channel too - especially that complete repair process was recorded on every important step. Soon I will upload a special repair video on my channel as well. Thank you all for your assistance and your helpful advices :wub:     | |
| Posted by: mactjaap on 2017-09-09 02:09:15 What a great story and happy end! Please post a link to your YouTube video if ready. I'm looking forward to see it. That you found such a small trace defective is impressive. | |
| Posted by: bibilit on 2017-09-09 05:53:18 Happy ending for me as well :   Still a problem with the I/O but i have got video. | |
| Posted by: MarNo84 on 2017-09-19 16:18:54 Yeah :lisa2: great job done! Actually I bought me two motherboards from eBay - they look very clean and in nearly perfect optical condition (untested). Especially one board has the original Lisa 1 / 2 Mouse port - my Lisa 2/5 board already has the "modern" port, so I will swap my motherboard too 😉 I think I will keep that repaired board maybe..just as an example/spare and give the other good board to my friend in exchange. Hmm, I will report back when they arrived at my door. | |
| Posted by: MarNo84 on 2017-09-24 09:26:49 Final Update: I also did repair every left bad trace on this motherboard - I also did the first wireowrk again - now it looks better, more professional 😉 After I tested everything again, I did use some Urethan 71 (plastic based isolating lacquer) to finish and safe the polished traces from future corrosion. ...and the funny thing is - after all these weeks of adventuring work on this motherboard - I got me 2 other motherboards on eBay 😉 one is in nearly perfect condition and works like a charm but the other one is a little bit messed up with uncleaned battery leakage on the slots and connectors. It's already in a cleaning bath with lemon accid 😀 the good / awesome thing on the uncleaned one: it seems to be an original LISA 1 board with it's original metalframe - it has still the original writings and symbols for each port - especially the beautiful mouse port 😉 this means some exchange with my actual metalframe and motherboard xD      | |
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