Blank screen after battery replacment

Battery replacement went well. But after about four hours of perfect use, the touch screen became unresponsive, it flashed full screen colors, went white, and went blank. Too much alcohol when softening adhesive?

I was able to soft turn off via volume and power keys. Then power on again, but no screen display. The phone rings, etc., but nothing visually.

What can I do next? I am a LONG way from any town or city.