No touch screen after replacing the screen assembly, what's wrong?

Got the touch screen not working after replacing the screen assembly, here is what happened:

# Opened the screen cover easily, no problem.

1. Try to remove the battery cable, but unfortunately disconnect the second port cable next to the battery port (I thought I did disconnect the battery cable, but I actually disconnect the wrong one, so, the battery cable is still connected with the logic board).
2. Removed the old LCD type screen assembly, and replaced it with the OLED type one.
3. Turn it on, everything works except the touch screen not functioning.
4. Try to reset the phone, no luck.
5. Try to enter into the recovery mode and do phone reset through Itunes, after finished, still no touch screen.
6. Try to put the old LCD screen assembly back, but still no touch screen (it used to be working fine before this replacement).

#

1. At this stage, I’m not sure if the logic board was damaged and causing the touch screen no longer working.
2. Any comments? What should I do further?
3. Many thanks!