General Category > LisaList2
Greetings from A New Lisa 2 Owner
ried:
--- Quote from: stepleton on August 31, 2023, 01:29:37 pm ---Put differently, I don't think that all 2/5s with the clip-on mouse connector were for-sure Lisa 1s.
--- End quote ---
Ah, very good point! It would be great to know how many Lisa 2/5s shipped with Lisa 1 motherboards that featured the clip-on mouse connector, and how many subsequently shipped without it.
JustG:
Thanks for all of the great replies! This Lisa was definitely converted so the mouse connector is the clip-on type, I have zero plans to make any permanent changes to the computer so no trimming of the mouse port! I pulled out the power supply, realized that I'm missing the cover for it so added that to the list. The battery has been removed and it looks like there have been some previous repairs. After looking closely at the power supply I don't see any obvious signs of unhappy capacitors.
Hopefully these pictures are suitable, I can always take more if that's helpful to anyone.
In all honesty this computer makes me REALLY nervous. The rarity of it and the fact that I really don't want to damage anything, I'm going to take these repairs very very slowly.
sigma7:
--- Quote from: JustG on September 01, 2023, 12:18:20 pm ---The battery has been removed...
--- End quote ---
The green stuff around the battery area indicates that corrosion is an issue. You need to neutralize the area so that corrosion does not continue to spread.
If you want this board to work again, you'll need to find/repair the broken traces.
--- Quote ---After looking closely at the power supply I don't see any obvious signs of unhappy capacitors.
--- End quote ---
All of the original translucent yellow capacitors are at risk of cracking and exploding (making a mess, not destroying your neighbourhood).
Your pic shows a 0.1uF cap along the right side C2 that looks like one of those. C3 & C4 look like suspects as well. It appears C1 was already replaced.
Make sure you use appropriately safety-rated (X/Y) caps for those.
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