Is it that 8 pin ic above the start label in the bottom? Finding a compatible replacement would be made easier by figuring out what it’s inputs / outputs are. Someone who’s familiar with common ICs could probably deduce it by looking at what it’s connected to - a good start might be to figure out which pin gets power at what voltage when it’s plugged in, and which pin is connected to ground. I guess it could be a programmable microcontroller but I think it could be a number of other simple things too. Sorry I don’t have any guesses