68kMLA Classic Interface
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| Click here to select a new forum. | | Apple Lisa Video Board Advice | Posted by: aplmak on 2022-04-01 04:17:16
Just a potential tip to those who are having Lisa video board issues. The first thing you should do is replace the capacitors! Second after that you might want to use some DeoxIT on the pentiometers (round little adjustments ontop) for video adjustments. You can find new ones sometimes but why not use some DeoxIT before hand to remove corrosion on them. Many others use it on ham radios, radios knobs.. I haven’t used it yet as I replaced mine but had I known, I would have tried this first!
Just some tips for Lisa owners! | Posted by: slipperygrey on 2022-04-11 08:53:06
This is a great tip, thanks for sharing! Let me add that the exact same type of potentiometer may exist inside on the PSU board as well. On the Lisa 2 I was working on, the pot on R29 seems to have been causing overvoltage that went away after working some contact cleaner into it. I found this out by working through the excellent troubleshooting steps in this forum thread. | | 1 |
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