Touch IC doesn't work after water damage

So I pulled a logic board from a damaged iPhone 6, for the purpose of unlocking my iCloud locked iPhone 6. Why do this instead of get a brand new iPhone? I got the locked iPhone 6 for free, and I won the auction for the damaged iPhone 6 was only $22, therefore I thought it would be a good solution.

The phone was water damaged, but I still thought the logic board looked fine, so I tried it anyways.

On further inspection, the EMI shield closest to the display connectors was a little bit dented. It didn't work at first, it was only recognized in iTunes as passcode locked. (The serial number had FMI off). I cleaned the connectors with rubbing alcohol, along with whatever I could access without taking the shields off. I also applied a little pressure to the board in order to fix the bend, which worked.

The phone booted up, but the touch screen was unresponsive. I verified that my screen was working with my other logic board, so I feel like it's something to do with the connector or the IC chips.

How would I go about trying to fix this now at home (e.g. removing the shields to clean more thoroughly). If things don't work out, what could a professional technician do to fix me an unlocked iPhone 6 using the parts I have (a working locked logic board, and all the parts of an iPhone 6).

Thanks to anyone who responds. I'm thankful that iFixit has such a helpful, dedicated community for problems like these.