68kMLA Classic Interface

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Mac Classic - garbled checkerboard

Posted by: igorb on 2020-11-08 08:57:37 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

Posted by: dochilli on 2020-11-09 00:42:17 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.

Posted by: igorb on 2020-11-09 00:49:25 I figured it out I think. One via does not connect. When I have some time, I'll try to fix it.

Posted by: Silverburn on 2021-02-04 17:51:33 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.

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