This repair really turned out good for my first round. I definitely wanted to make sure not to damage the LCD and Wi-Fi antenna. I have the proper tools to repair plenty more in the future.

First thing you want to do is make sure that all the cables and wiring are in place on your device's logic board. I have seen this several times in my cell phone repair history.

If that step does not fix the issues then you want to change refer to the Samsung Support site about No Signal issues.