iPhone 4s, Black display, but touchscreen and reg functions work?

I had a little humidity get into top ports on iPhone 4s. Managed to unfog/dry out the condensation on camera lens with vacuum cleaner and crevise tool. Power button quit working And proximity screwing up. Kept putting caller on mute or speaker, so I disassembled to see if I could fix. Power button still not working AND black screen. Everything else seems to be working fine.. Just can't see anything to operate phone!

Any ideas?

Thanks,

Deidre