Mac SE, every so often brightness variation

[LaPorta]

My main-use SE has developed a curious issue. Every so often (maybe a few minutes), the screen will suddenly get noticeably brighter by a bit, then later, back down a tad bit darker to where it was before. It is not huge: I only noticed it when using the SE in a darker environment. However, it is noticeable, and it could be the harbinger of a larger issue in the future, so I want to nail it now. This machine has been fully re-capped, with a great CRT, and otherwise the screen works perfectly without any issues at all.

Ideas as to what might cause this?

 

[ymk]

I'd look at the brightness pots, both the external and the trim.

 

[LaPorta]

External seems to work just fine, raising or lowering it doesn't seem to affect this.

 

[ymk]

Poor neck board connection?

 

[techknight]

Did you deoxit the pots?