Dark display after replacement, possible broken logic board?

Hello.

I replaced the display assembly yesterday. After some trouble with white streaks, I tried to clean the contacts with both oxide cleaner and bandaid-cleaner.

Now the screen is dark, and the phone vibrates in sequence when connecting the power supply.

I tried to connect the old display again, but still the same.

I have also tried to recover through Itunes without luck.

Could the logic board be damaged while cleaning?

Does anyone know if it's possible to get a replacement logic board?