Hello forum, I'm working on a cabinet build involving an old Sony KX1901 Profeel monitor and a computer running GA-2015 which will output through an AMD HD 6310. I am using the monitor's 34 pin inputs on the 1v analog settings and have got the system running well and at correct sync rates but having some issues I am hoping someone can help me identify. I am struggling with how to define my problems, as my guesses at search terms have not been productive.
Here is a video of Mame running one of the included Roms:
And here is LXDE:
I have identified 4 issues:
1) Colors fade after initial appearance on screen.
2) Mame runs in the lower left corner, but desktop and system menus are correctly centered otherwise.
3) Scaling seems wrong/too small.
4) Overscan is not setup correctly.
My assumption is that the color issues are related to monitor hardware. Something like output not being above threshold voltage. To clarify, the monitor works well as a television (ntsc) and I even prefer watching this unit to my newer hardware. Great color, clarity, and blackness. It is from 1982, so I realize a cap kit might be in order, but if so then likely only for the rgb input card rather than main board.
I double-checked my cable and couldn't find a problem, but that also might be a source of trouble. Unfortunately since it's all custom I can't swap to test it.
When I use an LCD monitor on vga out @ 31khz the output looks spot-on, but still not centered.
I can only imagine how much time this community has put into this amazing suite of software and drivers, so first off thank you for that. I would appreciate any tips or helpful links as I continue my troubleshooting efforts.