SE/30 Garbled screen

[lubert]

I bought an SE/30 which had the Simasimac symptoms, so I got the logic board recapped. The mac boots successfully now, however the screen has a strange flickering and garbled display. Any ideas what could be the culprit?

 

[Bolle]

Could be caused by an intermittent connection of an address line on one of the video address muxes (chips UA8 to UD8)

I had this exact symptom on one of my SE/30s and it took me ages to find because all address lines buzzed out fine on the first two tries but it was open when I went through everything a third time.

Also could be one of those chips is on its way out.

 

[lubert]

Thank you @Bolle for your insight, I will try to check all the address lines. If one of them does have an intermittent connection, what's the appropriate fix?