mobile

Dear Sirs
I hope that I can solve my problem here ,
Today , I tried to disassemble my mobile N7100 in order to fix my weak wifi signal .
I found a way to strengthen the signal through attaching a simple wire to the wifi pin , I cleaned the board using a toothbrush
after reassembling the device , I noticed that the screen was very faint , very white and I noticed some horizontal lines when starting up the device ;
although the screen touch still worked perfectly , but the display is so white or bright .

I have reassembled the device many times without any success , what should I do ?

Thanks in advance for your help ?