Watch randomly stopped responding

My watch randomly died while I was at work. The screen went from working normally, to only showing yellow-ish lines and kind of fading in and out, to not displaying picture at all now.... It's still functional, still charges (vibrates) and before I reset it through the app, my notifications would still make it vibrate. I'm just wondering if I should replace the screen or another component. I bought it back in 2020 used and already beaten up pretty good, as a work watch. It's had a rough life, from sand/steel dust to machining coolant/oil in the past 2 years. I've taken it apart after it died, and it doesn't appear any liquid got inside, though the screws did appear to have some corrosion on them. (Could have also been spottily applied loctite)

Am I looking at a screen or main board replacement? Obviously since I've opened it I'll replace the battery as well. I bought a galaxy watch active 2 in the meantime, but I'd like to fix this one for my S/O. Thanks!