Why is my signal low after replacing the front screen?

Just a few days ago, I replaced the lcd and front screen after I dropped it and everything seems to have been replaced correctly. However, I get very low signal for calls/texting, if any at all. It constantly is "searching" for the network or at best, I get one bar. I was told to reconnect the small black adapter wire found above the speakers to the corresponding plug on the motherboard, but that doesnt seem to have done it. I also read that people SOLDER a piece together and it works perfectly??!! I don't know about going that extreme, but I'd really appreciate it if someone could identify what part might need reconnected!

Many Thanks!!!