Wow! Twins. Nice work.
That add on edge connector looks to be a way to tap 5v or 12v onto something else. I use something similar to tap 12v for a q sound amp in an astro city
Should be easy to start looking at the neckboard. Get some good lighting and look at the neckboard for any obvious cracked joints. You can do this without removing the chassis or monitor.
If you don't see any, then you will have to take the chassis out and inspect that.
I did update the firmware and menu and the symptoms remain the same. To add to symptoms, the games also have missing graphics and sprites. The jail bars you see in the menu disappear when a game loads but the game has missing graphics and sprites.
I have edited the first post to include a link for more pictures of the following cabs: https://drive.google.com/drive/folders/1fzOD1o89LSlbPCDyPs0DL55VousCSVmS?usp=drive_link
Egret 3, $1200 Astro, $1,000 Blast
Couple things I noticed when lookin at them:
The New Astro - It has a MS8...
I have an issue with a Darksoft MVS Multi Unit. It has graphical issues shown in the picture. I have tried the following:
1.) Verified proper voltage levels
2.) Tried a different MVS Motherboard (MV1FZ)
3.) Tried a different known working SD Card from a different Darksoft MVS Multi
4.) Tried...