lcd replacement now signal is weak and cant make calls.

I have recently swapped all of the components (logicboard, cameras, earphone jack, ect ect) onto a new LCD+Frame. Ive done this several times with S3's and S4's so im not exactly new at this but for some reason I can not make any calls on the Note 2 now and i get really bad reception anywhere i go. I have replaced all antennas as well as the charging port unit in which they connect to.

Am now at a loss and dont know what to do. any tips or info would be great!

also.. does anyone know what the silver/metal sheeting like stuff (such as what is behind the charging port unit) is behind several of the components on these phones?