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Found this thanks to someone in the BlueSCSI discord, should I just start at J4 (Pin1) and check everything down the line with my multimeter?

Hey guys, it's been awhile since I've worked on any Macs. I have a Macintosh 128k (later revision board) that will chime but not show any video. I've tested the board in a known working case. When I first opened it up the board was slightly corroded, and after an alcohol wash it still doesn't...