Spilled some coffee on my mac it works but is now the largest mac mini

I spilled some coffee on my mac and turned it off and left it tiled so the little bit of coffee could drain off of it. ( i really spilled it on the table and 1-2 oz got on the mac). At the end of the day after using it for maybe 30 min the screen began to flicker and then cut out…. I tested it with an external display and it works great. all ports work great just the screen is not turning on? Could this be that coffee residue is in the cables or does it sound like the screen is really done for?