K4700 won't sync with YA horiz/vert daughter card

behrmr

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Donor 11 years: 2014-2022, 2024-2025
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I have a 13" K4700 that I acquired in a Gorf conversion. The monitor would not sync. The first thing I did was clean and cap it. After that I was still having the same issue. I reflowed the daughter cards. Same problem. I grabbed an XY board from a K4600 and popped it in and it synced. When comparing the cards I realized that the K4700 has the YA card (not XY). So figuring something was wrong with my YA card, I grabbed one out of a working K4700 I have on the shelf. The monitor won't sync with that one either. Anyone have any ideas?
 
Actually I was incorrect. This chassis WILL sync up with another YA board. So there is definitely something wrong with my XY/YA board.
 
The sync signal from the game board enters the monitor through the video interface board.

Yes. But it does sync when I swap out the YA board for a known working one. Maybe sync isn't the right word to use I'm not sure. It looks like a sort of roll left to right (horizontally).
 
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