Mac Classic - garbled checkerboard

[igorb]

Hi all!

I got this Mac Classic I, and after a recap it shows this garbled checkerboard pattern. It doesn't chime or do anything. 12V rails show 12V, 5V shows 5V.

I recapped and cleaned the analog board and the logic board.

I have tried all of the usual troubleshooting steps.

How do I go from here?

Thanks in advance

 

[dochilli]

Clean and Reseat the ROM. Could be a problem with the ROM. Do you have a RAM expansion board, then try it without the board.

 

[igorb]

I figured it out I think. One via does not connect. When I have some time, I'll try to fix it.

 

[Silverburn]

Did you get this to work? What’s a via?

I have the same issue - when you remove the ram expansion board it becomes a clean checkerboard.