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Home Forums Macintosh 512K corrupt display issue — #18 Macintosh 512K corrupt display issue — #18
Post #18 by techknight
Source ForumMacintosh 512K corrupt display issue — #18
CategoryTroubleshooting
Post DateMon, 2 Nov 2015 - 22:12
Original URLhttps://68kmla.org/bb/threads/macintosh-512k-corrupt-display-issue.2879/
Post
The problem is, that is a multilayer board. Chances are, there are some traces that run from the pins between the layers to other chips. 

So, If you pulled the chip out and ripped a trace, that means you pulled the plating/via and annular ring out with it. This also breaks internal layer connections if they exist. 

So without pin to pin checks, and short tests, its pretty much junk. 

mp.ls