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My SOS started acting up yesterday. I powered it on, played for a while, and then the monitor started blinking at me.
All 3 colors were fading out at the same time. After a few minutes, they would cut out, rather than fade out.

I connected the game to a spare monitor, but it did the same thing, so I plugged the cabinet monitor back in. (not the monitor)
I checked the video cable pins. I pulled the pins, cleaned them, checked for good tension. I also checked the other side, at the edge connector, and hit it with some fresh solder. (not the wire)
I checked the connector going from the card-rack lid to the XY Control & XY Timing boards.
I put fresh solder at the headers on both XY Control & XY Timing boards. They were looking grey, but not cold. New solder anyway.

I'm looking at the PCBs, now, tracking down where the signal's getting lost. Here's a vid (change the quality to 720p 60fps to see past the flickering):

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