Lisa video issue

[james_w]

So I've just replaced all the caps and power transistors in my Lisa 2/10's Datapower PSU. Seems a lot happier now, except that the next barrier I'm hitting is that the video is messed up:



Seems to me that this is most likely cap or pots replacements needed on the video board.

Can anyone advise on the best course of action? Should I start with cap replacement or pot replacement or something else?

Thanks!

 

[james_w]

Oh I have a happy ending for this. I sprayed a bit of contact cleaner into all the video pots, then on the suggestion of my brother gave each one a gentle but firm tap with the handle of a screwdriver. The video is now happy and working!

Just got to use a Lisa properly for the first time!  :lisa2:

 

[CelGen]

You seem to of had the same issue I had for years.  A simple twiddle of the pots back and fourth followed by a proper adjustment and I was getting a proper image again.

 

[Elfen]

Corrosion on the pots internals would make them read as if they were set at a different setting, so cleaning them with some "Tuner cleaner" would fix this.

Great job done!

 

[mactjaap]

Could you show a picture of your Lisa how it looka now. Had the same experiance!