My laptop's wireless was not working, so I opened the monitor to check the wireless cables and receiver.
you did not reassemble it correctly
lcd's tend to have two thin and LONG strips of gray and black or black and white strips of CONDUCTIVE rubber
these make contact inside to the circuit board
i would co check out the website "I-Fixit "
for your brand
they also sell the REQUIRED and NEEDED tools for this type of work